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See remote camera stream #103

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opened 2026-08-12 01:22:31 +02:00 by Benjamin_Loison · 5 comments
Benjamin_Loison commented 2026-08-12 01:22:31 +02:00
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This was not documented in this repository and my Debian and Cinnamon forks.

ssh pegasus ffmpeg -an -f video4linux2 -s 640x480 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin

It works fine on my Debian 13 GNOME Pegasus with viewers being my Linux Mint 22.3 Cinnamon Framework 13 and Fairphone 4 LineageOS 23.2 Termux. I had a doubt for my phone, but I confirm that above command works fine for my phone.

+6

This was not documented in this repository and my Debian and Cinnamon forks. ```bash ssh pegasus ffmpeg -an -f video4linux2 -s 640x480 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin ``` It works fine on my Debian 13 GNOME Pegasus with viewers being my Linux Mint 22.3 Cinnamon Framework 13 and Fairphone 4 LineageOS 23.2 Termux. I had a doubt for my phone, but I confirm that above command works fine for my phone. +6
Benjamin_Loison commented 2026-08-12 01:27:26 +02:00
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It would be nice to have a quicker access to the video stream.

image.png

It would be nice to have a quicker access to the video stream. ![image.png](/attachments/b4302ecb-e200-489e-b5a4-3539570ac2df)
image.png
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Benjamin_Loison commented 2026-08-13 19:46:18 +02:00
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For Termux before above command I use:

wiki.termux.com: Graphical Environment (6562)

vncserver -localhost
export DISPLAY=:1

1 may have to be changed depending on vncserver -localhost output.

VNC connection with localhost:5901 F-Droid: AVNC (com.gaurav.avnc).

For Termux before above command I use: [wiki.termux.com: Graphical Environment (6562)](https://wiki.termux.com/index.php?title=Graphical_Environment&oldid=6562) ```bash vncserver -localhost export DISPLAY=:1 ``` `1` may have to be changed depending on `vncserver -localhost` output. VNC connection with `localhost:5901` [F-Droid: AVNC (com.gaurav.avnc)](https://f-droid.org/en/packages/com.gaurav.avnc/).
Benjamin_Loison commented 2026-10-15 20:03:10 +02:00
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Related to Benjamin-Loison/obs-studio/issues/15.

Related to [Benjamin-Loison/obs-studio/issues/15](https://github.com/Benjamin-Loison/obs-studio/issues/15).
Benjamin_Loison commented 2026-11-04 17:42:22 +01:00
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ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1081 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
[video4linux2,v4l2 @ 0x55dd2d384280] The V4L2 driver changed the video from 1920x1081 to 1920x1080
Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B 
  Duration: N/A, start: 172230.456315, bitrate: 165888 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x55dd2d384d00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x55dd2d384d00] profile High 4:2:2, level 4.0, 4:2:2, 8-bit
[libx264 @ 0x55dd2d384d00] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=34 lookahead_threads=5 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'pipe:':
  Metadata:
    encoder         : Lavf61.7.103
  Stream #0:0: Video: h264 (H264 / 0x34363248), yuv422p(tv, progressive), 1920x1080, q=2-31, 500 kb/s, 10 fps, 1k tbn
      Metadata:
        encoder         : Lavc61.19.101 libx264
      Side data:
        cpb: bitrate max/min/avg: 0/0/500000 buffer size: 0 vbv_delay: N/A
Input #0, matroska,webm, from '/dev/stdin':   0KB sq=    0B  bitrate= 334.9kbits/s dup=45 drop=0 speed=0.111x     
  Metadata:
    ENCODER         : Lavf61.7.103
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: h264 (High 4:2:2), yuv422p(tv, progressive), 1920x1080, 10 fps, 10 tbr, 1k tbn
      Metadata:
        ENCODER         : Lavc61.19.101 libx264
frame=   52 fps=4.0 q=27.0 size=     114KiB time=00:00:05.00 bitrate= 187.5kbits/s dup=65 drop=0 speed=0.385x    
[vost#0:0/libx264 @ 0x55dd2d387180] Error submitting a packet to the muxer: Broken pipe70 drop=0 speed=0.428x    
    Last message repeated 1 times
[out#0/matroska @ 0x55dd2d3867c0] Error muxing a packet
[out#0/matroska @ 0x55dd2d3867c0] Task finished with error code: -32 (Broken pipe)
[out#0/matroska @ 0x55dd2d3867c0] Terminating thread with return code -32 (Broken pipe)
[out#0/matroska @ 0x55dd2d3867c0] Error writing trailer: Broken pipe
[out#0/matroska @ 0x55dd2d3867c0] Error closing file: Broken pipe
[out#0/matroska @ 0x55dd2d3867c0] video:307KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
frame=   63 fps=4.4 q=-1.0 Lsize=     220KiB time=00:00:06.10 bitrate= 295.0kbits/s dup=71 drop=0 speed=0.421x    
[libx264 @ 0x55dd2d384d00] frame I:1     Avg QP:25.61  size: 40608
[libx264 @ 0x55dd2d384d00] frame P:36    Avg QP:27.55  size: 16863
[libx264 @ 0x55dd2d384d00] frame B:105   Avg QP:29.54  size:  3560
[libx264 @ 0x55dd2d384d00] consecutive B-frames:  1.4%  0.0%  0.0% 98.6%
[libx264 @ 0x55dd2d384d00] mb I  I16..4: 22.2% 75.4%  2.4%
[libx264 @ 0x55dd2d384d00] mb P  I16..4:  1.0%  1.7%  0.0%  P16..4: 30.5%  5.0%  5.7%  0.0%  0.0%    skip:55.9%
[libx264 @ 0x55dd2d384d00] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 12.1%  0.4%  0.0%  direct: 2.2%  skip:85.1%  L0:72.0% L1:25.5% BI: 2.5%
[libx264 @ 0x55dd2d384d00] final ratefactor: 29.06
[libx264 @ 0x55dd2d384d00] 8x8 transform intra:69.2% inter:91.1%
[libx264 @ 0x55dd2d384d00] coded y,uvDC,uvAC intra: 37.1% 83.8% 37.3% inter: 4.2% 15.6% 1.9%
[libx264 @ 0x55dd2d384d00] i16 v,h,dc,p: 38% 18%  5% 39%
[libx264 @ 0x55dd2d384d00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 12% 26%  7%  7%  7%  5%  5%  6%
[libx264 @ 0x55dd2d384d00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 23% 12%  6% 10%  8%  8%  4%  3%
[libx264 @ 0x55dd2d384d00] i8c dc,h,v,p: 58% 14% 23%  5%
[libx264 @ 0x55dd2d384d00] Weighted P-Frames: Y:0.0% UV:0.0%
[libx264 @ 0x55dd2d384d00] ref P L0: 45.6%  5.3% 32.1% 17.0%
[libx264 @ 0x55dd2d384d00] ref B L0: 76.3% 14.0%  9.7%
[libx264 @ 0x55dd2d384d00] ref B L1: 98.7%  1.3%
[libx264 @ 0x55dd2d384d00] kb/s:575.45

Note:

[video4linux2,v4l2 @ 0x55dd2d384280] The V4L2 driver changed the video from 1920x1081 to 1920x1080

So can use:

1920x1080:

ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B 
  Duration: N/A, start: 172271.357793, bitrate: 165888 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn
Stream mapping:
  Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264))
Press [q] to stop, [?] for help
[libx264 @ 0x556070c4cd00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512
[libx264 @ 0x556070c4cd00] profile High 4:2:2, level 4.0, 4:2:2, 8-bit
[libx264 @ 0x556070c4cd00] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=34 lookahead_threads=5 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00
Output #0, matroska, to 'pipe:':
  Metadata:
    encoder         : Lavf61.7.103
  Stream #0:0: Video: h264 (H264 / 0x34363248), yuv422p(tv, progressive), 1920x1080, q=2-31, 500 kb/s, 10 fps, 1k tbn
      Metadata:
        encoder         : Lavc61.19.101 libx264
      Side data:
        cpb: bitrate max/min/avg: 0/0/500000 buffer size: 0 vbv_delay: N/A
Input #0, matroska,webm, from '/dev/stdin':   0KB sq=    0B  bitrate= 333.7kbits/s dup=45 drop=0 speed=0.111x     
  Metadata:
    ENCODER         : Lavf61.7.103
  Duration: N/A, start: 0.000000, bitrate: N/A
  Stream #0:0: Video: h264 (High 4:2:2), yuv422p(tv, progressive), 1920x1080, 10 fps, 10 tbr, 1k tbn
      Metadata:
        ENCODER         : Lavc61.19.101 libx264
frame=   48 fps=3.8 q=27.0 size=     114KiB time=00:00:04.60 bitrate= 202.3kbits/s dup=63 drop=0 speed=0.368x    
[vost#0:0/libx264 @ 0x556070c4f180] Error submitting a packet to the muxer: Broken pipe68 drop=0 speed=0.415x    
    Last message repeated 1 times
[out#0/matroska @ 0x556070c4e7c0] Error muxing a packet
[out#0/matroska @ 0x556070c4e7c0] Task finished with error code: -32 (Broken pipe)
[out#0/matroska @ 0x556070c4e7c0] Terminating thread with return code -32 (Broken pipe)
[out#0/matroska @ 0x556070c4e7c0] Error writing trailer: Broken pipe
[out#0/matroska @ 0x556070c4e7c0] Error closing file: Broken pipe
[out#0/matroska @ 0x556070c4e7c0] video:221KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown
frame=   59 fps=4.2 q=-1.0 Lsize=     169KiB time=00:00:05.70 bitrate= 243.6kbits/s dup=69 drop=0 speed=0.404x    
[libx264 @ 0x556070c4cd00] frame I:1     Avg QP:25.64  size: 40449
[libx264 @ 0x556070c4cd00] frame P:35    Avg QP:27.49  size: 16510
[libx264 @ 0x556070c4cd00] frame B:102   Avg QP:29.53  size:  3380
[libx264 @ 0x556070c4cd00] consecutive B-frames:  1.4%  0.0%  0.0% 98.6%
[libx264 @ 0x556070c4cd00] mb I  I16..4: 21.3% 76.5%  2.2%
[libx264 @ 0x556070c4cd00] mb P  I16..4:  1.2%  2.1%  0.0%  P16..4: 33.6%  4.8%  6.3%  0.0%  0.0%    skip:52.1%
[libx264 @ 0x556070c4cd00] mb B  I16..4:  0.0%  0.1%  0.0%  B16..8: 13.3%  0.3%  0.0%  direct: 2.2%  skip:84.1%  L0:71.9% L1:26.2% BI: 1.9%
[libx264 @ 0x556070c4cd00] final ratefactor: 29.54
[libx264 @ 0x556070c4cd00] 8x8 transform intra:69.8% inter:93.0%
[libx264 @ 0x556070c4cd00] coded y,uvDC,uvAC intra: 30.8% 73.3% 28.7% inter: 4.2% 16.4% 1.5%
[libx264 @ 0x556070c4cd00] i16 v,h,dc,p: 39% 17%  6% 38%
[libx264 @ 0x556070c4cd00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 11% 32%  6%  5%  6%  5%  4%  5%
[libx264 @ 0x556070c4cd00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 27% 12%  6% 10% 10%  8%  3%  3%
[libx264 @ 0x556070c4cd00] i8c dc,h,v,p: 62% 11% 22%  5%
[libx264 @ 0x556070c4cd00] Weighted P-Frames: Y:8.6% UV:2.9%
[libx264 @ 0x556070c4cd00] ref P L0: 46.1%  6.6% 31.6% 15.7%  0.1%
[libx264 @ 0x556070c4cd00] ref B L0: 77.6% 13.6%  8.8%
[libx264 @ 0x556070c4cd00] ref B L1: 98.0%  2.0%
[libx264 @ 0x556070c4cd00] kb/s:558.31
Conversion failed!

which works fine graphically.

dup increases to about 50 before rendering (hence a few seconds), why?

```bash ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1081 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 [video4linux2,v4l2 @ 0x55dd2d384280] The V4L2 driver changed the video from 1920x1081 to 1920x1080 Input #0, video4linux2,v4l2, from '/dev/video0':B sq= 0B Duration: N/A, start: 172230.456315, bitrate: 165888 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264)) Press [q] to stop, [?] for help [libx264 @ 0x55dd2d384d00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512 [libx264 @ 0x55dd2d384d00] profile High 4:2:2, level 4.0, 4:2:2, 8-bit [libx264 @ 0x55dd2d384d00] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=34 lookahead_threads=5 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, matroska, to 'pipe:': Metadata: encoder : Lavf61.7.103 Stream #0:0: Video: h264 (H264 / 0x34363248), yuv422p(tv, progressive), 1920x1080, q=2-31, 500 kb/s, 10 fps, 1k tbn Metadata: encoder : Lavc61.19.101 libx264 Side data: cpb: bitrate max/min/avg: 0/0/500000 buffer size: 0 vbv_delay: N/A Input #0, matroska,webm, from '/dev/stdin': 0KB sq= 0B bitrate= 334.9kbits/s dup=45 drop=0 speed=0.111x Metadata: ENCODER : Lavf61.7.103 Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: h264 (High 4:2:2), yuv422p(tv, progressive), 1920x1080, 10 fps, 10 tbr, 1k tbn Metadata: ENCODER : Lavc61.19.101 libx264 frame= 52 fps=4.0 q=27.0 size= 114KiB time=00:00:05.00 bitrate= 187.5kbits/s dup=65 drop=0 speed=0.385x [vost#0:0/libx264 @ 0x55dd2d387180] Error submitting a packet to the muxer: Broken pipe70 drop=0 speed=0.428x Last message repeated 1 times [out#0/matroska @ 0x55dd2d3867c0] Error muxing a packet [out#0/matroska @ 0x55dd2d3867c0] Task finished with error code: -32 (Broken pipe) [out#0/matroska @ 0x55dd2d3867c0] Terminating thread with return code -32 (Broken pipe) [out#0/matroska @ 0x55dd2d3867c0] Error writing trailer: Broken pipe [out#0/matroska @ 0x55dd2d3867c0] Error closing file: Broken pipe [out#0/matroska @ 0x55dd2d3867c0] video:307KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown frame= 63 fps=4.4 q=-1.0 Lsize= 220KiB time=00:00:06.10 bitrate= 295.0kbits/s dup=71 drop=0 speed=0.421x [libx264 @ 0x55dd2d384d00] frame I:1 Avg QP:25.61 size: 40608 [libx264 @ 0x55dd2d384d00] frame P:36 Avg QP:27.55 size: 16863 [libx264 @ 0x55dd2d384d00] frame B:105 Avg QP:29.54 size: 3560 [libx264 @ 0x55dd2d384d00] consecutive B-frames: 1.4% 0.0% 0.0% 98.6% [libx264 @ 0x55dd2d384d00] mb I I16..4: 22.2% 75.4% 2.4% [libx264 @ 0x55dd2d384d00] mb P I16..4: 1.0% 1.7% 0.0% P16..4: 30.5% 5.0% 5.7% 0.0% 0.0% skip:55.9% [libx264 @ 0x55dd2d384d00] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 12.1% 0.4% 0.0% direct: 2.2% skip:85.1% L0:72.0% L1:25.5% BI: 2.5% [libx264 @ 0x55dd2d384d00] final ratefactor: 29.06 [libx264 @ 0x55dd2d384d00] 8x8 transform intra:69.2% inter:91.1% [libx264 @ 0x55dd2d384d00] coded y,uvDC,uvAC intra: 37.1% 83.8% 37.3% inter: 4.2% 15.6% 1.9% [libx264 @ 0x55dd2d384d00] i16 v,h,dc,p: 38% 18% 5% 39% [libx264 @ 0x55dd2d384d00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 25% 12% 26% 7% 7% 7% 5% 5% 6% [libx264 @ 0x55dd2d384d00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 23% 12% 6% 10% 8% 8% 4% 3% [libx264 @ 0x55dd2d384d00] i8c dc,h,v,p: 58% 14% 23% 5% [libx264 @ 0x55dd2d384d00] Weighted P-Frames: Y:0.0% UV:0.0% [libx264 @ 0x55dd2d384d00] ref P L0: 45.6% 5.3% 32.1% 17.0% [libx264 @ 0x55dd2d384d00] ref B L0: 76.3% 14.0% 9.7% [libx264 @ 0x55dd2d384d00] ref B L1: 98.7% 1.3% [libx264 @ 0x55dd2d384d00] kb/s:575.45 ``` </details> Note: > [video4linux2,v4l2 @ 0x55dd2d384280] The V4L2 driver changed the video from 1920x1081 to 1920x1080 So can use: 1920x1080: ``` ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 Input #0, video4linux2,v4l2, from '/dev/video0':B sq= 0B Duration: N/A, start: 172271.357793, bitrate: 165888 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn Stream mapping: Stream #0:0 -> #0:0 (rawvideo (native) -> h264 (libx264)) Press [q] to stop, [?] for help [libx264 @ 0x556070c4cd00] using cpu capabilities: MMX2 SSE2Fast SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 AVX512 [libx264 @ 0x556070c4cd00] profile High 4:2:2, level 4.0, 4:2:2, 8-bit [libx264 @ 0x556070c4cd00] 264 - core 164 r3108 31e19f9 - H.264/MPEG-4 AVC codec - Copyleft 2003-2023 - http://www.videolan.org/x264.html - options: cabac=1 ref=3 deblock=1:0:0 analyse=0x3:0x113 me=hex subme=7 psy=1 psy_rd=1.00:0.00 mixed_ref=1 me_range=16 chroma_me=1 trellis=1 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=-2 threads=34 lookahead_threads=5 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=3 b_pyramid=2 b_adapt=1 b_bias=0 direct=1 weightb=1 open_gop=0 weightp=2 keyint=250 keyint_min=10 scenecut=40 intra_refresh=0 rc_lookahead=40 rc=abr mbtree=1 bitrate=500 ratetol=1.0 qcomp=0.60 qpmin=0 qpmax=69 qpstep=4 ip_ratio=1.40 aq=1:1.00 Output #0, matroska, to 'pipe:': Metadata: encoder : Lavf61.7.103 Stream #0:0: Video: h264 (H264 / 0x34363248), yuv422p(tv, progressive), 1920x1080, q=2-31, 500 kb/s, 10 fps, 1k tbn Metadata: encoder : Lavc61.19.101 libx264 Side data: cpb: bitrate max/min/avg: 0/0/500000 buffer size: 0 vbv_delay: N/A Input #0, matroska,webm, from '/dev/stdin': 0KB sq= 0B bitrate= 333.7kbits/s dup=45 drop=0 speed=0.111x Metadata: ENCODER : Lavf61.7.103 Duration: N/A, start: 0.000000, bitrate: N/A Stream #0:0: Video: h264 (High 4:2:2), yuv422p(tv, progressive), 1920x1080, 10 fps, 10 tbr, 1k tbn Metadata: ENCODER : Lavc61.19.101 libx264 frame= 48 fps=3.8 q=27.0 size= 114KiB time=00:00:04.60 bitrate= 202.3kbits/s dup=63 drop=0 speed=0.368x [vost#0:0/libx264 @ 0x556070c4f180] Error submitting a packet to the muxer: Broken pipe68 drop=0 speed=0.415x Last message repeated 1 times [out#0/matroska @ 0x556070c4e7c0] Error muxing a packet [out#0/matroska @ 0x556070c4e7c0] Task finished with error code: -32 (Broken pipe) [out#0/matroska @ 0x556070c4e7c0] Terminating thread with return code -32 (Broken pipe) [out#0/matroska @ 0x556070c4e7c0] Error writing trailer: Broken pipe [out#0/matroska @ 0x556070c4e7c0] Error closing file: Broken pipe [out#0/matroska @ 0x556070c4e7c0] video:221KiB audio:0KiB subtitle:0KiB other streams:0KiB global headers:0KiB muxing overhead: unknown frame= 59 fps=4.2 q=-1.0 Lsize= 169KiB time=00:00:05.70 bitrate= 243.6kbits/s dup=69 drop=0 speed=0.404x [libx264 @ 0x556070c4cd00] frame I:1 Avg QP:25.64 size: 40449 [libx264 @ 0x556070c4cd00] frame P:35 Avg QP:27.49 size: 16510 [libx264 @ 0x556070c4cd00] frame B:102 Avg QP:29.53 size: 3380 [libx264 @ 0x556070c4cd00] consecutive B-frames: 1.4% 0.0% 0.0% 98.6% [libx264 @ 0x556070c4cd00] mb I I16..4: 21.3% 76.5% 2.2% [libx264 @ 0x556070c4cd00] mb P I16..4: 1.2% 2.1% 0.0% P16..4: 33.6% 4.8% 6.3% 0.0% 0.0% skip:52.1% [libx264 @ 0x556070c4cd00] mb B I16..4: 0.0% 0.1% 0.0% B16..8: 13.3% 0.3% 0.0% direct: 2.2% skip:84.1% L0:71.9% L1:26.2% BI: 1.9% [libx264 @ 0x556070c4cd00] final ratefactor: 29.54 [libx264 @ 0x556070c4cd00] 8x8 transform intra:69.8% inter:93.0% [libx264 @ 0x556070c4cd00] coded y,uvDC,uvAC intra: 30.8% 73.3% 28.7% inter: 4.2% 16.4% 1.5% [libx264 @ 0x556070c4cd00] i16 v,h,dc,p: 39% 17% 6% 38% [libx264 @ 0x556070c4cd00] i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 26% 11% 32% 6% 5% 6% 5% 4% 5% [libx264 @ 0x556070c4cd00] i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 22% 27% 12% 6% 10% 10% 8% 3% 3% [libx264 @ 0x556070c4cd00] i8c dc,h,v,p: 62% 11% 22% 5% [libx264 @ 0x556070c4cd00] Weighted P-Frames: Y:8.6% UV:2.9% [libx264 @ 0x556070c4cd00] ref P L0: 46.1% 6.6% 31.6% 15.7% 0.1% [libx264 @ 0x556070c4cd00] ref B L0: 77.6% 13.6% 8.8% [libx264 @ 0x556070c4cd00] ref B L1: 98.0% 2.0% [libx264 @ 0x556070c4cd00] kb/s:558.31 Conversion failed! ``` </details> which works fine graphically. `dup` increases to about 50 before rendering (hence a few seconds), why?
Benjamin_Loison commented 2026-11-04 17:45:56 +01:00
Author
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ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -f matroska - | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
[in#0 @ 0x55b0d6ceb040] Error opening input: Device or resource busy
Error opening input file /dev/video0.
Error opening input files: Device or resource busy
[matroska,webm @ 0x7efcec000c80] EBML header parsing failed
/dev/stdin: Invalid data found when processing input
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B

ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
[in#0 @ 0x5618cd9b2040] Error opening input: Device or resource busy
Error opening input file /dev/video0.
Error opening input files: Device or resource busy
[matroska,webm @ 0x7f7094000c80] EBML header parsing failed 
/dev/stdin: Invalid data found when processing input

ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
Trailing option(s) found in the command: may be ignored.
Input #0, video4linux2,v4l2, from '/dev/video0':B sq=    0B 
  Duration: N/A, start: 174156.931839, bitrate: 165888 kb/s
  Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn
At least one output file must be specified
[video4linux2,v4l2 @ 0x558426465240] Some buffers are still owned by the caller on close.
ioctl(VIDIOC_QBUF): Bad file descriptorvq=    0KB sq=    0B 
[matroska,webm @ 0x7f7ac4000c80] EBML header parsing failed
/dev/stdin: Invalid data found when processing input
    nan    :  0.000 fd=   0 aq=    0KB vq=    0KB sq=    0B

 ssh pegasus_other_network ffmpeg -an -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin
Output: 
ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers
  built with gcc 14 (Debian 14.2.0-19)
  configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared
  libavutil      59. 39.100 / 59. 39.100
  libavcodec     61. 19.101 / 61. 19.101
  libavformat    61.  7.103 / 61.  7.103
  libavdevice    61.  3.100 / 61.  3.100
  libavfilter    10.  5.100 / 10.  5.100
  libswscale      8.  3.100 /  8.  3.100
  libswresample   5.  3.100 /  5.  3.100
  libpostproc    58.  3.100 / 58.  3.100
[in#0 @ 0x55f97a0c2040] Error opening input: Device or resource busy
Error opening input file /dev/video0.
Error opening input files: Device or resource busy
[matroska,webm @ 0x7f8a34000c80] EBML header parsing failed
/dev/stdin: Invalid data found when processing input

ffmpeg --help 2> /dev/null | grep -Ee '-(an|r|b)'

-r[:<stream_spec>] <rate>  override input framerate/convert to given output framerate (Hz value, fraction or abbreviation)
-b <bitrate>        video bitrate (please use -b:v)
-an                 disable audio
-ab <bitrate>       alias for -b:a (select bitrate for audio streams)

So all parameters seem decent.

```bash ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -f matroska - | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 [in#0 @ 0x55b0d6ceb040] Error opening input: Device or resource busy Error opening input file /dev/video0. Error opening input files: Device or resource busy [matroska,webm @ 0x7efcec000c80] EBML header parsing failed /dev/stdin: Invalid data found when processing input nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B ``` </details> ```bash ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 [in#0 @ 0x5618cd9b2040] Error opening input: Device or resource busy Error opening input file /dev/video0. Error opening input files: Device or resource busy [matroska,webm @ 0x7f7094000c80] EBML header parsing failed /dev/stdin: Invalid data found when processing input ``` </details> ``` ssh pegasus_other_network ffmpeg -an -f video4linux2 -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 Trailing option(s) found in the command: may be ignored. Input #0, video4linux2,v4l2, from '/dev/video0':B sq= 0B Duration: N/A, start: 174156.931839, bitrate: 165888 kb/s Stream #0:0: Video: rawvideo (YUY2 / 0x32595559), yuyv422, 1920x1080, 165888 kb/s, 5 fps, 5 tbr, 1000k tbn At least one output file must be specified [video4linux2,v4l2 @ 0x558426465240] Some buffers are still owned by the caller on close. ioctl(VIDIOC_QBUF): Bad file descriptorvq= 0KB sq= 0B [matroska,webm @ 0x7f7ac4000c80] EBML header parsing failed /dev/stdin: Invalid data found when processing input nan : 0.000 fd= 0 aq= 0KB vq= 0KB sq= 0B ``` </details> ``` ssh pegasus_other_network ffmpeg -an -s 1920x1080 -i /dev/video0 -r 10 -b:v 500k -f matroska - | ffplay -f matroska /dev/stdin ``` <details> <summary>Output:</summary> ``` ffplay version 7.1.5-0+deb13u1 Copyright (c) 2003-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 ffmpeg version 7.1.5-0+deb13u1 Copyright (c) 2000-2026 the FFmpeg developers built with gcc 14 (Debian 14.2.0-19) configuration: --prefix=/usr --extra-version=0+deb13u1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libcaca --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-pocketsphinx --enable-librsvg --enable-libjxl --enable-shared libavutil 59. 39.100 / 59. 39.100 libavcodec 61. 19.101 / 61. 19.101 libavformat 61. 7.103 / 61. 7.103 libavdevice 61. 3.100 / 61. 3.100 libavfilter 10. 5.100 / 10. 5.100 libswscale 8. 3.100 / 8. 3.100 libswresample 5. 3.100 / 5. 3.100 libpostproc 58. 3.100 / 58. 3.100 [in#0 @ 0x55f97a0c2040] Error opening input: Device or resource busy Error opening input file /dev/video0. Error opening input files: Device or resource busy [matroska,webm @ 0x7f8a34000c80] EBML header parsing failed /dev/stdin: Invalid data found when processing input ``` </details> ```bash ffmpeg --help 2> /dev/null | grep -Ee '-(an|r|b)' ``` ``` -r[:<stream_spec>] <rate> override input framerate/convert to given output framerate (Hz value, fraction or abbreviation) -b <bitrate> video bitrate (please use -b:v) -an disable audio -ab <bitrate> alias for -b:a (select bitrate for audio streams) ``` So all parameters seem decent.
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Reference: Benjamin_Loison/linux#103