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Keep last frame if following one is black #8

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opened 2026-10-03 20:16:23 +02:00 by Benjamin_Loison · 15 comments
Benjamin_Loison commented 2026-10-03 20:16:23 +02:00
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Would help Benjamin_Loison/Voice_assistant/issues/57.

Related to #3.

Would help [Benjamin_Loison/Voice_assistant/issues/57](https://codeberg.org/Benjamin_Loison/Voice_assistant/issues/57). Related to #3.
Benjamin_Loison commented 2026-10-03 20:18:46 +02:00
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DuckDuckGo and Google search ffmpeg keep last frame of following one is black.

DuckDuckGo and Google search *ffmpeg keep last frame of following one is black*.
Benjamin_Loison commented 2026-10-03 20:19:17 +02:00
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The Super User question 1795530 may help.

[The Super User question 1795530](https://superuser.com/q/1795530) may help.
Benjamin_Loison commented 2026-10-03 20:32:03 +02:00
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https://chat.mistral.ai/work/8ce2a02c-813b-4b0a-be1b-5d2b50d60de6

seems complicated.

https://chatgpt.com/share/6ac14818-9054-83eb-b46d-35d2238a7a93

https://chatgpt.com/share/6ac14929-712c-83eb-a9fd-c537e5df4f80

does not help.

https://claude.ai/share/a3b9f533-1c39-4bae-94f3-6c167b41cdeb

  • Overlay or concat producing black
  • Freeze a specific frame in the middle

may help.

https://chat.mistral.ai/work/8ce2a02c-813b-4b0a-be1b-5d2b50d60de6 seems complicated. https://chatgpt.com/share/6ac14818-9054-83eb-b46d-35d2238a7a93 https://chatgpt.com/share/6ac14929-712c-83eb-a9fd-c537e5df4f80 does not help. https://claude.ai/share/a3b9f533-1c39-4bae-94f3-6c167b41cdeb - *Overlay or concat producing black* - *Freeze a specific frame in the middle* may help.
Benjamin_Loison commented 2026-10-03 22:05:19 +02:00
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I could proceed in Python frame by frame alternatively, but I suspect that it would be inefficient.

I could proceed in Python frame by frame alternatively, but I suspect that it would be inefficient.
Benjamin_Loison commented 2026-10-15 22:17:40 +02:00
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Shotcut Fairphone 4 LineageOS 23.2 export:

ffprobe b.mp4
Output: 
ffprobe version 7.1.5-0+deb13u1 Copyright (c) 2007-2026 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, mov,mp4,m4a,3gp,3g2,mj2, from 'b.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.7.103
  Duration: 00:00:15.68, start: 0.000000, bitrate: 119 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], 112 kb/s, 13.72 fps, 13.72 tbr, 16240 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
Shotcut Fairphone 4 LineageOS 23.2 export: ```bash ffprobe b.mp4 ``` <details> <summary>Output:</summary> ``` ffprobe version 7.1.5-0+deb13u1 Copyright (c) 2007-2026 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, mov,mp4,m4a,3gp,3g2,mj2, from 'b.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf61.7.103 Duration: 00:00:15.68, start: 0.000000, bitrate: 119 kb/s Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], 112 kb/s, 13.72 fps, 13.72 tbr, 16240 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 2 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] ``` </details>
Benjamin_Loison commented 2026-10-15 22:23:37 +02:00
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https://chat.mistral.ai/work/b15c2974-582b-4cd1-98d0-23f954851ed9

https://chatgpt.com/share/6ad1373c-0308-83eb-a5f1-76a92bf60e4f

https://claude.ai/share/1b90b366-89ff-4935-a16e-148af0f6f8b4

Wikipedia: Luma (video) (1351363170)

DuckDuckGo search YAVG and YAVG brightness.

https://chat.mistral.ai/work/b15c2974-582b-4cd1-98d0-23f954851ed9 https://chatgpt.com/share/6ad1373c-0308-83eb-a5f1-76a92bf60e4f https://claude.ai/share/1b90b366-89ff-4935-a16e-148af0f6f8b4 [Wikipedia: Luma (video) (1351363170)](https://en.wikipedia.org/w/index.php?title=Luma_(video)&oldid=1351363170) DuckDuckGo search *YAVG* and *YAVG brightness*.
Benjamin_Loison commented 2026-10-15 22:56:49 +02:00
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https://ayosec.github.io/ffmpeg-filters-docs/4.1/Filters/Video/signalstats.html

https://ayosec.github.io/ffmpeg-filters-docs/4.1/Filters/Video/signalstats.html
Benjamin_Loison commented 2026-10-15 23:17:11 +02:00
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Bash script: 
in=c.mp4
fps=$(ffprobe -v error -select_streams v:0 -of csv=p=0 -show_entries stream=r_frame_rate "$in")
ffmpeg -i "$in"   -vf "signalstats,metadata=mode=select:key=lavfi.signalstats.YMAX:value=17:function=greater,fps=fps=$fps:start_time=0"   -c:v libx265 -crf 18 -preset medium -pix_fmt yuv420p   -c:a copy output.mp4
Output: 
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, mov,mp4,m4a,3gp,3g2,mj2, from 'c.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.7.103
  Duration: 00:00:15.68, start: 0.000000, bitrate: 533 kb/s
  Stream #0:0[0x1](und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], 434 kb/s, 13.72 fps, 13.72 tbr, 16240 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 94 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
File 'output.mp4' already exists. Overwrite? [y/N] y
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265))
  Stream #0:1 -> #0:1 (copy)
Press [q] to stop, [?] for help
x265 [info]: HEVC encoder version 4.1+1-1d117be
x265 [info]: build info [Linux][GCC 14.2.0][64 bit] 8bit+10bit+12bit
x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2
x265 [info]: Main profile, Level-5 (Main tier)
x265 [info]: Thread pool created using 16 threads
x265 [info]: Slices                              : 1
x265 [info]: frame threads / pool features       : 4 / wpp(37 rows)
x265 [info]: Coding QT: max CU size, min CU size : 64 / 8
x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra
x265 [info]: ME / range / subpel / merge         : hex / 57 / 2 / 3
x265 [info]: Keyframe min / max / scenecut / bias  : 13 / 250 / 40 / 5.00 
x265 [info]: Lookahead / bframes / badapt        : 20 / 4 / 2
x265 [info]: b-pyramid / weightp / weightb       : 1 / 1 / 0
x265 [info]: References / ref-limit  cu / depth  : 3 / off / on
x265 [info]: AQ: mode / str / qg-size / cu-tree  : 2 / 1.0 / 32 / 1
x265 [info]: Rate Control / qCompress            : CRF-18.0 / 0.60
x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip mode=1 signhide tmvp
x265 [info]: tools: b-intra strong-intra-smoothing lslices=8 deblock sao
Output #0, mp4, to 'output.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf61.7.103
  Stream #0:0(und): Video: hevc (hev1 / 0x31766568), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], q=2-31, 13.72 fps, 16240 tbn (default)
      Metadata:
        handler_name    : VideoHandler
        vendor_id       : [0][0][0][0]
        encoder         : Lavc61.19.101 libx265
      Side data:
        cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A
  Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 94 kb/s (default)
      Metadata:
        handler_name    : SoundHandler
        vendor_id       : [0][0][0][0]
frame=   12 fps= 12 q=19.1 size=       0KiB time=00:00:00.72 bitrate=   0.5kbits/frame=   38 fps= 25 q=24.0 size=       0KiB time=00:00:02.62 bitrate=   0.1kbits/frame=   38 fps= 19 q=24.0 size=       0KiB time=00:00:02.62 bitrate=   0.1kbits/frame=   60 fps= 24 q=17.5 size=     256KiB time=00:00:04.22 bitrate= 496.0kbits/frame=  101 fps= 34 q=21.0 size=     256KiB time=00:00:07.21 bitrate= 290.6kbits/frame=  132 fps= 38 q=21.0 size=     256KiB time=00:00:09.47 bitrate= 221.3kbits/frame=  157 fps= 39 q=22.0 size=     256KiB time=00:00:11.30 bitrate= 185.6kbits/frame=  177 fps= 39 q=20.9 size=     256KiB time=00:00:12.75 bitrate= 164.4kbits/[out#0/mp4 @ 0x55d93a775300] video:368KiB audio:180KiB subtitle:0KiB other streams:0KiB global headers:2KiB muxing overhead: 2.352386%
frame=  215 fps= 44 q=24.0 Lsize=     561KiB time=00:00:15.52 bitrate= 296.1kbits/s speed=3.18x    
x265 [info]: frame I:      1, Avg QP:17.87  kb/s: 5849.36 
x265 [info]: frame P:     75, Avg QP:20.52  kb/s: 391.78  
x265 [info]: frame B:    139, Avg QP:23.37  kb/s: 43.22   
x265 [info]: Weighted P-Frames: Y:6.7% UV:4.0%

encoded 215 frames in 4.78s (44.97 fps), 191.81 kb/s, Avg QP:22.35

seems to work fine both for video and audio.
That is audio kept as is and black segments correctly retain last non-black frame and does not misbehave as the proposed Claude proposal when being back to mainly black launcher was faulty due to average and threshold not being as low as possible.

<details> <summary>Bash script:</summary> ```bash in=c.mp4 fps=$(ffprobe -v error -select_streams v:0 -of csv=p=0 -show_entries stream=r_frame_rate "$in") ffmpeg -i "$in" -vf "signalstats,metadata=mode=select:key=lavfi.signalstats.YMAX:value=17:function=greater,fps=fps=$fps:start_time=0" -c:v libx265 -crf 18 -preset medium -pix_fmt yuv420p -c:a copy output.mp4 ``` </details> <details> <summary>Output:</summary> ``` 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, mov,mp4,m4a,3gp,3g2,mj2, from 'c.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf61.7.103 Duration: 00:00:15.68, start: 0.000000, bitrate: 533 kb/s Stream #0:0[0x1](und): Video: h264 (High 4:4:4 Predictive) (avc1 / 0x31637661), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], 434 kb/s, 13.72 fps, 13.72 tbr, 16240 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 94 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] File 'output.mp4' already exists. Overwrite? [y/N] y Stream mapping: Stream #0:0 -> #0:0 (h264 (native) -> hevc (libx265)) Stream #0:1 -> #0:1 (copy) Press [q] to stop, [?] for help x265 [info]: HEVC encoder version 4.1+1-1d117be x265 [info]: build info [Linux][GCC 14.2.0][64 bit] 8bit+10bit+12bit x265 [info]: using cpu capabilities: MMX2 SSE2Fast LZCNT SSSE3 SSE4.2 AVX FMA3 BMI2 AVX2 x265 [info]: Main profile, Level-5 (Main tier) x265 [info]: Thread pool created using 16 threads x265 [info]: Slices : 1 x265 [info]: frame threads / pool features : 4 / wpp(37 rows) x265 [info]: Coding QT: max CU size, min CU size : 64 / 8 x265 [info]: Residual QT: max TU size, max depth : 32 / 1 inter / 1 intra x265 [info]: ME / range / subpel / merge : hex / 57 / 2 / 3 x265 [info]: Keyframe min / max / scenecut / bias : 13 / 250 / 40 / 5.00 x265 [info]: Lookahead / bframes / badapt : 20 / 4 / 2 x265 [info]: b-pyramid / weightp / weightb : 1 / 1 / 0 x265 [info]: References / ref-limit cu / depth : 3 / off / on x265 [info]: AQ: mode / str / qg-size / cu-tree : 2 / 1.0 / 32 / 1 x265 [info]: Rate Control / qCompress : CRF-18.0 / 0.60 x265 [info]: tools: rd=3 psy-rd=2.00 early-skip rskip mode=1 signhide tmvp x265 [info]: tools: b-intra strong-intra-smoothing lslices=8 deblock sao Output #0, mp4, to 'output.mp4': Metadata: major_brand : isom minor_version : 512 compatible_brands: isomiso2avc1mp41 encoder : Lavf61.7.103 Stream #0:0(und): Video: hevc (hev1 / 0x31766568), yuv420p(tv, bt709, progressive), 1080x2340 [SAR 1:1 DAR 6:13], q=2-31, 13.72 fps, 16240 tbn (default) Metadata: handler_name : VideoHandler vendor_id : [0][0][0][0] encoder : Lavc61.19.101 libx265 Side data: cpb: bitrate max/min/avg: 0/0/0 buffer size: 0 vbv_delay: N/A Stream #0:1(und): Audio: aac (LC) (mp4a / 0x6134706D), 48000 Hz, stereo, fltp, 94 kb/s (default) Metadata: handler_name : SoundHandler vendor_id : [0][0][0][0] frame= 12 fps= 12 q=19.1 size= 0KiB time=00:00:00.72 bitrate= 0.5kbits/frame= 38 fps= 25 q=24.0 size= 0KiB time=00:00:02.62 bitrate= 0.1kbits/frame= 38 fps= 19 q=24.0 size= 0KiB time=00:00:02.62 bitrate= 0.1kbits/frame= 60 fps= 24 q=17.5 size= 256KiB time=00:00:04.22 bitrate= 496.0kbits/frame= 101 fps= 34 q=21.0 size= 256KiB time=00:00:07.21 bitrate= 290.6kbits/frame= 132 fps= 38 q=21.0 size= 256KiB time=00:00:09.47 bitrate= 221.3kbits/frame= 157 fps= 39 q=22.0 size= 256KiB time=00:00:11.30 bitrate= 185.6kbits/frame= 177 fps= 39 q=20.9 size= 256KiB time=00:00:12.75 bitrate= 164.4kbits/[out#0/mp4 @ 0x55d93a775300] video:368KiB audio:180KiB subtitle:0KiB other streams:0KiB global headers:2KiB muxing overhead: 2.352386% frame= 215 fps= 44 q=24.0 Lsize= 561KiB time=00:00:15.52 bitrate= 296.1kbits/s speed=3.18x x265 [info]: frame I: 1, Avg QP:17.87 kb/s: 5849.36 x265 [info]: frame P: 75, Avg QP:20.52 kb/s: 391.78 x265 [info]: frame B: 139, Avg QP:23.37 kb/s: 43.22 x265 [info]: Weighted P-Frames: Y:6.7% UV:4.0% encoded 215 frames in 4.78s (44.97 fps), 191.81 kb/s, Avg QP:22.35 ``` </details> seems to work fine both for video and audio. That is audio kept as is and black segments correctly retain last non-black frame and does not misbehave as the proposed Claude proposal when being back to mainly black launcher was faulty due to average and threshold not being as low as possible.
test.mlt
15 KiB
output.mp4
561 KiB
c.mp4
1022 KiB
Benjamin_Loison commented 2026-10-15 23:18:43 +02:00
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Being 3 times faster than the recording seems fast enough on my Debian 13 GNOME Framework 13.

Being 3 times faster than the recording seems fast enough on my Debian 13 GNOME Framework 13.
Benjamin_Loison commented 2026-10-15 23:25:02 +02:00
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echo $fps

1015/74

is unclear.

```bash echo $fps ``` ``` 1015/74 ``` is unclear.
Benjamin_Loison commented 2026-10-15 23:29:41 +02:00
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-c:v libx265 is again necessary to play in VLC.

`-c:v libx265` is again necessary to play in VLC.
Benjamin_Loison commented 2026-10-15 23:33:26 +02:00
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ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate "$in"
Output: 
[STREAM]
r_frame_rate=1015/74
[/STREAM]
```bash ffprobe -v error -select_streams v:0 -show_entries stream=r_frame_rate "$in" ``` <details> <summary>Output:</summary> ``` [STREAM] r_frame_rate=1015/74 [/STREAM] ``` </details>
Benjamin_Loison commented 2026-10-15 23:33:50 +02:00
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ffprobe -v error -select_streams v:0 -of csv=p -show_entries stream=r_frame_rate "$in"

[csv @ 0x55e544945f40] Failed to parse option string 'p' provided to writer context
```bash ffprobe -v error -select_streams v:0 -of csv=p -show_entries stream=r_frame_rate "$in" ``` ``` [csv @ 0x55e544945f40] Failed to parse option string 'p' provided to writer context ```
Benjamin_Loison commented 2026-10-15 23:39:22 +02:00
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Bash script: 
ffmpeg -i c.mp4 -vf 'signalstats,metadata=mode=select:key=lavfi.signalstats.YMAX:value=17:function=greater' -c:v libx265 output.mp4

seems to behave identically and being minimized.

<details> <summary>Bash script:</summary> ```bash ffmpeg -i c.mp4 -vf 'signalstats,metadata=mode=select:key=lavfi.signalstats.YMAX:value=17:function=greater' -c:v libx265 output.mp4 ``` </details> seems to behave identically and being minimized.
Benjamin_Loison commented 2026-10-19 17:17:32 +02:00
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Related to Benjamin-Loison/shotcut/issues/24.

Related to [Benjamin-Loison/shotcut/issues/24](https://github.com/Benjamin-Loison/shotcut/issues/24).
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Reference: Benjamin_Loison/ffmpeg#8