Default postprocessor fails when encountering "Unknown" stream

Checklist

• I’m reporting a bug unrelated to a specific site
• I’ve verified that I’m running yt-dlp version 2021.12.27. (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

Description

I am working on a default extractor for ESPN+ streams. The extractor is not fully functional yet as I have had to hardcode a few auth tokens, but after doing so I am able to successfully download the video. However, I seem to be running into an issue with the postprocessor:

ERROR: Postprocessing: If you want them copied, please use -copy_unknown

This seems to be related to #2 and #9. I am not sure why the -dn option is not ignoring the excess unknown stream, which is 0:2

If I manually add -ignore_unkown to the command, no post-processing is attempted at all, which leaves me in the same position as before, with a .mp4 file that has not been fixed up. I should also mention that I see this same error without doing anything with my new extractor, by that I mean I get the same result by just directly giving yt-dlp the master.m3u8 and the required header.

Verbose log

yt-dlp -f hls-4190 https://www.espn.com/watch/player/_/id/2935a850-ad4b-4f93-adb8-0b4d60821e66 --cookies espn.com_cookies.txt -o luton.mp4 --fixup force -v
[debug] Command-line config: ['-f', 'hls-4190', 'https://www.espn.com/watch/player/_/id/2935a850-ad4b-4f93-adb8-0b4d60821e66', '--cookies', 'espn.com_cookies.txt', '-o', 'luton.mp4', '--fixup', 'force', '-v']
[debug] Encodings: locale UTF-8, fs utf-8, out utf-8, err utf-8, pref UTF-8
[debug] yt-dlp version 2021.12.27 [6223f67a8]
[debug] Lazy loading extractors is disabled
[debug] Python version 3.9.9 (CPython 64bit) - macOS-12.1-arm64-arm-64bit
[debug] exe versions: ffmpeg 4.4.1 (setts), ffprobe 4.4.1
[debug] Optional libraries: Cryptodome, mutagen, sqlite, websockets
[debug] Proxy map: {}
[debug] [WatchESPN] Extracting URL: https://www.espn.com/watch/player/_/id/2935a850-ad4b-4f93-adb8-0b4d60821e66
[WatchESPN] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading JSON metadata
[WatchESPN] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading JSON metadata
[WatchESPN] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading JSON metadata
[WatchESPN] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading JSON metadata
[WatchESPN] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading m3u8 information
[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
[info] 2935a850-ad4b-4f93-adb8-0b4d60821e66: Downloading 1 format(s): hls-4190
[debug] Invoking downloader on "https://vod-akc-na.media.plus.espn.com/ps01/espn/event/2022/01/09/Luton_Town_vs_Harrogate_T_20220109_1641725757031/3500K/3500_complete_aeng-trimmed.m3u8"
[download] luton.mp4 has already been downloaded
[download] 100% of 3.42GiB
[debug] ffprobe command line: ffprobe -hide_banner -show_format -show_streams -print_format json file:luton.mp4
[FixupM3u8] Fixing MPEG-TS in MP4 container of "luton.mp4"
[debug] ffmpeg command line: ffmpeg -y -loglevel repeat+info -i file:luton.mp4 -c copy -map 0 -dn -f mp4 -bsf:a aac_adtstoasc -movflags +faststart file:luton.temp.mp4
[debug] ffmpeg version 4.4.1 Copyright (c) 2000-2021 the FFmpeg developers
  built with Apple clang version 13.0.0 (clang-1300.0.29.3)
  configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/4.4.1_3 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libbluray --enable-libdav1d --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-avresample --enable-videotoolbox
  libavutil      56. 70.100 / 56. 70.100
  libavcodec     58.134.100 / 58.134.100
  libavformat    58. 76.100 / 58. 76.100
  libavdevice    58. 13.100 / 58. 13.100
  libavfilter     7.110.100 /  7.110.100
  libavresample   4.  0.  0 /  4.  0.  0
  libswscale      5.  9.100 /  5.  9.100
  libswresample   3.  9.100 /  3.  9.100
  libpostproc    55.  9.100 / 55.  9.100
[mpegts @ 0x15181b600] Could not find codec parameters for stream 2 (Unknown: none (CUEI / 0x49455543)): unknown codec
Consider increasing the value for the 'analyzeduration' (0) and 'probesize' (5000000) options
Input #0, mpegts, from 'file:luton.mp4':
  Duration: 02:14:08.21, start: 3451.648200, bitrate: 3645 kb/s
  Program 1 
  Stream #0:0[0x1e1]: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p(progressive), 1280x720 [SAR 1:1 DAR 16:9], Closed Captions, 59.94 fps, 59.94 tbr, 90k tbn, 119.88 tbc
  Stream #0:1[0x1e2]: Audio: aac (LC) ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 128 kb/s
  Stream #0:2[0x4a6]: Unknown: none (CUEI / 0x49455543)
  Stream #0:3[0x4a7]: Data: timed_id3 (ID3  / 0x20334449)
Cannot map stream #0:2 - unsupported type.
If you want unsupported types ignored instead of failing, please use the -ignore_unknown option
If you want them copied, please use -copy_unknown
ERROR: Postprocessing: If you want them copied, please use -copy_unknown
Traceback (most recent call last):
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/YoutubeDL.py", line 3119, in process_info
    replace_info_dict(self.post_process(dl_filename, info_dict, files_to_move))
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/YoutubeDL.py", line 3292, in post_process
    info = self.run_pp(pp, info)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/YoutubeDL.py", line 3236, in run_pp
    files_to_delete, infodict = pp.run(infodict)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/common.py", line 22, in run
    ret = func(self, info, *args, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/common.py", line 117, in wrapper
    return func(self, info)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/ffmpeg.py", line 890, in run
    self._fixup('Fixing MPEG-TS in MP4 container', info['filepath'], [
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/ffmpeg.py", line 851, in _fixup
    self.run_ffmpeg(filename, temp_filename, options)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/ffmpeg.py", line 327, in run_ffmpeg
    return self.run_ffmpeg_multiple_files([path], out_path, opts, **kwargs)
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/ffmpeg.py", line 281, in run_ffmpeg_multiple_files
    return self.real_run_ffmpeg(
  File "/opt/homebrew/lib/python3.9/site-packages/yt_dlp/postprocessor/ffmpeg.py", line 320, in real_run_ffmpeg
    raise FFmpegPostProcessorError(stderr.split('\n')[-1])
yt_dlp.postprocessor.ffmpeg.FFmpegPostProcessorError: If you want them copied, please use -copy_unknown

[pukkandan]

you can use any random file upload service (google drive?). If you want to share the link privately, you can reach me on discord or just email me

[ischmidt20]

Hmmm, I must have not been adding the argument properly before. Now when I add --postprocessor-args -ignore_unknown to the command (in addition to --fixup force on a file that had already been downloaded), the fixup works. If you don’t want to include it in the postprocessor by default, is there any way it can be added as a default argument for a single extractor only?