TS file from sat that does not play [NO PAT]

added Component::Demuxers: TS Severity::normal Type::bug Version::master git + 1 deleted label

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Running dvbinfo (examples/dvbinfo/dvbinfo -f ~/Videos/libdvbpsi/cartoonsample-fortissatellite.ts) on this file gives me:

Summary: Bandwidth Found PID: 270 (0x 10e), DRM: no, bitrate 0.0000 kbit/s, seen 9 packets Found PID: 511 (0x 1ff), DRM: no, bitrate 0.0000 kbit/s, seen 5 packets Found PID: 516 (0x 204), DRM: no, bitrate 0.0000 kbit/s, seen 886 packets Found PID: 580 (0x 244), DRM: no, bitrate 0.0000 kbit/s, seen 43 packets Found PID: 654 (0x 28e), DRM: no, bitrate 0.0000 kbit/s, seen 118 packets Found PID: 664 (0x 298), DRM: no, bitrate 0.0000 kbit/s, seen 115 packets

Total bitrate inf kbits/s Number of packets: 1176, stuffing 0 packets, lost 0 bytes PCR first: 0, last: 0, duration: 0

What strikes me is that there is not PAT (pid 0) which is the official starting point for every MPEG-TS compliant transport stream file. Without a PAT, there is no way you can find the PMT and the video, audio ES'es.

The avformat demuxer just tries to play the first Video and Audio elementary stream it finds. Ignoring the fact that this sample is broken. The VLC TS demuxer is written to support MPEG-TS transports streams and requires the PAT (pid 0), and PMT to be present.

Replying to [ticket:10650 jb]:

Works with --demux avformat --avformat-format mpegts

Should also work without --avformat-format

Sorry I simply disagree, the vlc ts demuxer was designed to be MPEG-TS specification compliant. This means every MPEG-TS (transport stream) should have a PAT (pid 0) and a PMT in order to able to find the elementary stream (Video and Audio).

Then, if it fails, it should give the stream back to avformat.

Replying to [comment:4 jpsaman]:

Sorry I simply disagree

Sorry, I believe I was unclear: I think the sample plays fine with vlc --demux ffmpeg, the option --avformat-format should not be needed. I have no opinion whether vlc should play the sample by default. The MPlayer mpegts demuxer refuses to play such samples, FFmpeg policy was always to decode broken samples if at all possible.

Except you can't know the PAT/PMT frequency, and then know it is missing until EOF/EOS.

changed title from TS file from sat that does not play to TS file from sat that does not play [NO PAT]

commit bfb2e970 Author: Francois Cartegnie fcvlcdev@free.fr Date: Sun Jan 25 12:30:18 2015 +0100

demux: ts: add PAT/PMT hotfix (fix [#10650](https://code.videolan.org/videolan/vlc/-/issues/10650))

Some recorded TS streams does not include PAT/PMT.
Just feed one when missing.
refs [#7940](https://code.videolan.org/videolan/vlc/-/issues/7940)

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TS file from sat that does not play [NO PAT]

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