ChanServ changed the topic of #ffmpeg to: Welcome to the FFmpeg USER support channel | Development channel: #ffmpeg-devel | Bug reports: https://ffmpeg.org/bugreports.html | Wiki: https://trac.ffmpeg.org/ | This channel is publically logged | FFmpeg 7.1.1 is released
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<Guest17>
[fc#0 @ 0x55df6ad3d540] Stream specifier ':a' in filtergraph description [0:v]subtitles=/tmp/gl1.srt[video0];[1:v]subtitles=/tmp/gl2.srt[video1];[video0][video1]concat=n=2[vout];[0:a][1:a]concat=n=2[aout] matches no streams.
<Guest17>
Just how?
<Guest17>
I checked that all the streams have an audio track.
<microchip_>
filtergraph is for video?
<Guest17>
microchip_: so I need a separate one for audio?
<microchip_>
yes
<furq>
[0:a][1:a]concat=n=2:v=0:a=1[aout]
<Guest17>
Oh, great.
<Guest17>
I've seen graphs where concat is used both for video and audio though.
<Guest17>
I should rather stick to this approach as stream lengths are not guaranteed to match.
<furq>
[video0][0:a][video1][1:a]concat=n=2:v=1:a=1[vout][aout] should also work
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<Guest17>
Oh, and I discovered that outputting to an mpegts file gives the same tolerance for errors as with ffplay. Nothing is truncated prematurily.
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<Guest17>
The file appears a bit corrupted too somehow though (probably need to fix timestamps also).
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<Guest17>
Okay, how do I fix "timestamp discontinuity" errors? `-fflags +genpts` does not help. There's still a video with video dropouts which accumulate and go out of sync with the audio and end much earlier.
<Guest17>
pts/dts seem to be even in the mpegts file though. Probably the discontinuity is on the stream level then?
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