[CBC] not download CLOSED-CAPTIONS subtitles

Checklist

• I’m reporting a broken site
• I’ve verified that I’m running yt-dlp version 2022.02.04. (update instructions)
• I’ve checked that all provided URLs are alive and playable in a browser
• I’ve checked that all URLs and arguments with special characters are properly quoted or escaped
• I’ve searched the bugtracker for similar issues including closed ones. DO NOT post duplicates
• I’ve read the guidelines for opening an issue
• I’ve read about sharing account credentials and I’m willing to share it if required

Region

Canada

Description

It has captions on website (English subtitles), but YT DLP don’t see them and don’t download them. There is no URI attribute in m3u8 file, captions are marked as CLOSED-CAPTIONS

#EXT-X-MEDIA:TYPE=CLOSED-CAPTIONS,GROUP-ID="CC",LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES,INSTREAM-ID="CC1"
#EXT-X-STREAM-INF:BANDWIDTH=2767793,RESOLUTION=1280x720,CODECS="avc1.4d401f,mp4a.40.2",AUDIO="audio",CLOSED-CAPTIONS="CC"

Maybe it could be related to some another extractor: https://github.com/yt-dlp/yt-dlp/pull/1980/commits/f3fa3e1404cade685373e1c84df7edc1415b06d5 ?

Verbose log

[debug] Command-line config: ['-vU', 'https://gem.cbc.ca/media/absolutely-canadian/s10', '--list-subs']
[debug] Encodings: locale cp1250, fs utf-8, out utf-8, err utf-8, pref cp1250
[debug] yt-dlp version 2022.02.04 [c1653e9ef] (win_exe)
[debug] Python version 3.10.1 (CPython 64bit) - Windows-10-10.0.19044-SP0
[debug] exe versions: ffmpeg N-104959-gfa2e460f63-20211221 (setts), ffprobe N-104959-gfa2e460f63-20211221
[debug] Optional libraries: Cryptodome, mutagen, sqlite, websockets
[debug] Proxy map: {}
Latest version: 2022.02.04, Current version: 2022.02.04
yt-dlp is up to date (2022.02.04)
[debug] [gem.cbc.ca:playlist] Extracting URL: https://gem.cbc.ca/media/absolutely-canadian/s10
[gem.cbc.ca:playlist] absolutely-canadian/s10: Downloading JSON metadata
[download] Downloading playlist: Season 10
[gem.cbc.ca:playlist] playlist Season 10: Collected 1 videos; downloading 1 of them
[download] Downloading video 1 of 1
[debug] Using fake IP 99.255.78.80 (CA) as X-Forwarded-For
[debug] [gem.cbc.ca] Extracting URL: https://gem.cbc.ca/media/absolutely-canadian/s10e01
[gem.cbc.ca] absolutely-canadian/s10e01: Downloading JSON metadata
[gem.cbc.ca] absolutely-canadian/s10e01: Downloading JSON metadata
[gem.cbc.ca] absolutely-canadian/s10e01: Downloading m3u8 information
[gem.cbc.ca] absolutely-canadian/s10e01: Downloading secret XML
[debug] Formats sorted by: hasvid, ie_pref, lang, quality, res, fps, hdr:12(7), vcodec:vp9.2(10), acodec, filesize, fs_approx, tbr, vbr, abr, asr, proto, vext, aext, hasaud, source, id
absolutely-canadian/s10e01 has no subtitles
[download] Finished downloading playlist: Season 10

[pukkandan]

Being useful does not mean it is in scope of the program. yt-dlp doesn’t even “know” that there are subs in the video till after it is downloaded. So even if this is implemented, it will just have to blindly call ffmpeg on the downloaded file. You can just do that using --exec instead. So I don’t think this is a compelling enough reason to add an entire postprocessor

[mtrakal]

If someone will need to extract subtitles, command for ffmepg which works for CBC: ffmpeg -f lavfi -i movie="input_file.mp4"[out+subcc] -map 0:1 extracted_subtitles.srt