[FFmpeg-trac] #10629(undetermined:new): ffmpeg concat destroys metadata tracks when combining TS (Transport Stream) files

[FFmpeg]

#10629: ffmpeg concat destroys metadata tracks when combining TS (Transport Stream)
files
--------------------------------------+----------------------------------
             Reporter:  superbonaci   |                     Type:  defect
               Status:  new           |                 Priority:  minor
            Component:  undetermined  |                  Version:  6.0
             Keywords:                |               Blocked By:
             Blocking:                |  Reproduced by developer:  0
Analyzed by developer:  0             |
--------------------------------------+----------------------------------
 Summary of the bug:
 How to reproduce:
 {{{
 % ffmpeg -h
 ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
   built with Apple clang version 14.0.3 (clang-1403.0.22.14.1)
   configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/6.0_1 --enable-
 shared --enable-pthreads --enable-version3 --cc=clang --host-cflags=
 --host-ldflags= --enable-ffplay --enable-gnutls --enable-gpl --enable-
 libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-
 libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-
 librubberband --enable-libsnappy --enable-libsrt --enable-libsvtav1
 --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-videotoolbox
 --enable-audiotoolbox --enable-neon
   libavutil      58.  2.100 / 58.  2.100
   libavcodec     60.  3.100 / 60.  3.100
   libavformat    60.  3.100 / 60.  3.100
   libavdevice    60.  1.100 / 60.  1.100
   libavfilter     9.  3.100 /  9.  3.100
   libswscale      7.  1.100 /  7.  1.100
   libswresample   4. 10.100 /  4. 10.100
   libpostproc    57.  1.100 / 57.  1.100
 Hyper fast Audio and Video encoder
 usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options]
 outfile}...
 }}}

 How to reproduce:
 Use the concat demuxer or protocol to combine/merge/concatenate .ts files
 which are part of whole stream.

 The stream can be any https://www.twitch.tv/ stream.
 The stream is made of several .ts parts which can be combined:
 index-0000000000.ts
 ...
 index-0000000945.ts

 into output.ts

 Parts can be downloaded with:
 {{{
 % twitch-dl download https://www.twitch.tv/videos/1462570126 -k -q source
 --no-join
 }}}

 To get the properly formatted combined file, use
 [https://www.downloadhelper.net Video Download Helper] and set it to
 download .ts files, so can save them as .m2ts

 ffmpeg does not concatenate the parts like [https://www.downloadhelper.net
 DownloadHelper] or [https://github.com/lay295/TwitchDownloader
 TwitchDownloader] do (these produce the same exact file, same sha1).
 Apparently the audio and video streams merged by ffmpeg are in good
 condition but several metadata is destroyed. The other 2 programs keep
 everything as is.

 The method that concatenates properly all the parts is available here
 (.NET Framework):
 https://github.com/lay295/TwitchDownloader/blob/fefd3d18f84185977b9959032dd423b7e1fed405/TwitchDownloaderCore/VideoDownloader.cs#L663-L698
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/10629>
FFmpeg <https://ffmpeg.org>
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