Benjamin_Loison/YouTube_captions_search_engine
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Fix #13: Add captions extraction

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I was about to commit in addition:

```c++
// Due to videos with automatically generated captions but being set to `Off` by default aren't retrieved with `--sub-langs '.*orig'`.
// My workaround is to first call YouTube Data API v3 Captions: list endpoint with `part=snippet` and retrieve the language that has `"trackKind": "asr"` (automatic speech recognition) in `snippet`.
/*json data = getJson(threadId, "captions?part=snippet&videoId=" + videoId, true, channelToTreat),
     items = data["items"];
for(const auto& item : items)
{
    json snippet = item["snippet"];
    if(snippet["trackKind"] == "asr")
    {
        string language = snippet["language"];
        cmd = cmdCommonPrefix + "--write-auto-subs --sub-langs '" + language + "-orig' --sub-format ttml --convert-subs vtt" + cmdCommonPostfix;
        exec(threadId, cmd);
        // As there should be a single automatic speech recognized track, there is no need to go through all tracks.
        break;
    }
}*/
```

Instead of:

```c++
cmd = cmdCommonPrefix + "--write-auto-subs --sub-langs '.*orig' --sub-format ttml --convert-subs vtt" + cmdCommonPostfix;
exec(threadId, cmd);
```

But I realized that, as the GitHub comment I was about to add to https://github.com/yt-dlp/yt-dlp/issues/2655, I was
wrong:

> `yt-dlp --cookies cookies.txt --sub-langs 'en.*,.*orig' --write-auto-subs https://www.youtube.com/watch?v=tQqDBySHYlc` work as expected. Many thanks again.
>
> ```
> 'subtitleslangs': ['en.*','.*orig'],
> 'writeautomaticsub': True,
> ```
>
> Work as expected too. Thank you
>
> Very sorry for the video sample. I even not watched it.

Thank you for this workaround. However note that videos having automatically generated subtitles but being set to `Off` by default aren't retrieved with your method (example of such video: [`mozyXsZJnQ4`](https://www.youtube.com/watch?v=mozyXsZJnQ4)). My workaround is to first call [YouTube Data API v3](https://developers.google.com/youtube/v3) [Captions: list](https://developers.google.com/youtube/v3/docs/captions/list) endpoint with [`part=snippet`](https://developers.google.com/youtube/v3/docs/captions/list#part) and retrieve the [`language`](https://developers.google.com/youtube/v3/docs/captions#snippet.language) that has [`"trackKind": "asr"`](https://developers.google.com/youtube/v3/docs/captions#snippet.trackKind) (automatic speech recognition) in [`snippet`](https://developers.google.com/youtube/v3/docs/captions#snippet).
This commit is contained in:
Benjamin Loison
2023-02-10 20:03:08 +01:00
parent 9b792015fa
commit 04c59eb025
2 changed files with 55 additions and 5 deletions
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README.md
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@@ -15,8 +15,9 @@ Have to proceed with a breadth-first search approach as treating all *child* cha
Because of [the current compression mechanism](https://gitea.lemnoslife.com/Benjamin_Loison/YouTube_captions_search_engine/issues/30), Linux is the only known OS able to run this algorithm.
```sh
sudo apt install nlohmann-json3-dev
sudo apt install nlohmann-json3-dev yt-dlp
make
./youtubeCaptionsSearchEngine -h
```
Except if you provide the argument `--youtube-operational-api-instance-url https://yt.lemnoslife.com`, you have [to host your own instance of the YouTube operational API](https://github.com/Benjamin-Loison/YouTube-operational-API/#install-your-own-instance-of-the-api).