BtbN 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 7.0 is released
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<megumin>
the first video is lanscape the second one is portrait
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<ggherdov>
Hello, I've concatenated 4 videos into one with "ffmpeg -f concat -i list.txt -c copy out.mp4". The codecs for the original videos are H264 and AAC.
<ggherdov>
The resulting merged video has problems, if I seek back and forth when playing it with mplayer. All parts seems to be there, but audio and video get easily out of synch.
<ggherdov>
Is there a better invocation of "ffmpeg -f concat" to produce a more robust output video?
<BtbN>
try remuxing to mpegts before concatenating
<BtbN>
also, try not using mplayer
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<wavecatcher>
Hi, I am trying to remove a subtitle stream from a video but codec copying and mapping only a/v streams to the output does not work, any ideas?
<wavecatcher>
Here's the command:
<BtbN>
Are you sure it's a subtitle stream, and not embedded CC or even just straight up burned in?
<wavecatcher>
When I do ffprobe, It shows up as athird stream under Input 0, with the format of data
<wavecatcher>
I'm trying to remove it because it's pointless anyway, ffprobe flags it as erroneous
<furq>
according to this it's a chapter stream and -map_chapters -1 will get rid of it
<wavecatcher>
Maybe my fault for trusting debian's packages to be relatively problem-free :P
<BtbN>
They're just bloody old, and stuff gets fixed all the time
<BtbN>
and only the most critical security fixes get backported
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<wavecatcher>
furq: If I can get it playing on the tv, i'll ignore the little stream error
<furq>
well you might as well add that if you're transcoding it anyway
<BtbN>
More than likely your TV just can't play 10 bit content
<wavecatcher>
Yeah probably.
<wavecatcher>
furq: That pixel setting did not work
<wavecatcher>
It still shows as high 10 with ffprobe
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<ggherdov>
BtbN: you suggested I remux to mpegts before concatenating (my problem: concat 4 videos, the output is out of synch). I'm trying to understand how to do it. Is it the "Using intermediate files" part from the "concatenate" wiki page? https://trac.ffmpeg.org/wiki/Concatenate#Usingintermediatefiles
<ggherdov>
The command there converts each mp4 into a ts, then concat all the ts's together into an mp4
<BtbN>
That's a different approach
<ggherdov>
ah.
<BtbN>
But you remux them exactly like shown there
<BtbN>
but then stick to the concat format, not the protocol like they do there
<BtbN>
concat protocol is literally just cat 1.ts 2.ts > full.ts
<BtbN>
That only works if the streams are made for it, i.e. were cut from one file before
<ggherdov>
BtbN: Ok I see. Meanwhile I found out more of what's wrong with my original concatenated output: where there should be the transition (cut) from input video #1 to input video #2, the audio from video #2 starts (good), but the video frame from video #1 stays there for a good 90 seconds (bad). So that's why I have an offset between audio and video from that point on. I'll try your suggestion, remuxing to mpeg-ts.
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<ggherdov>
BtbN: remuxing to mpeg-ts, then doing "ffmpeg -f concat" with that, worked great! thanks for your help
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<jemius>
half-offtopic: can someone recommend video upscaling software or algorithms [within or outside of ffmpeg]?