I would try separate separate concats for audio and video, as they are demuxed anyway before filtergraph.
In Tue, 25 Jan 2022 09:35:59 +0100 Bo Berglund <bo.bergl...@gmail.com> wrote: > This is about ffmpeg usage on Linux... > > I am nightly downloading news shows from several sources and > sometimes a show from one might be bad at the end and another at the > beginning. So I use ffmpeg to cut out the good parts from both and > then paste them together using this method in a "paste" script: > 1) create a joinfile listing all of the parts to paste > 2) create the output video using this: > ffmpeg -f concat -safe 0 -i $JOINFILE -c copy $TARGETFILE > > This always works for parts extracted from the same video (commercial > removal) and often also from parts coming from different download > sources. The download script always converts the videos on the fly to > the same 852x480 pixel format. > > But sometimes the video parts seems to paste OK but the audio is > either missing in later parts or severely shifted (by many seconds it > seems like). > > Each small part when played by itself is perfectly OK. > > How would the command look like in order to combine the video parts > such that audio and video are not shifted? > > I have tried this but it failed: > > ffmpeg -hide_banner -i input.1.mp4 -i input.2.mp4 -filter_complex > "[0:v] [0:a] [1:v] [1:a] concat=n=2:v=1:a=1 [v] [a]" -map "[v]" -map > "[a]" output.mp4 > > Output (after the normal ffmpeg stuff): > > [Parsed_concat_0 @ 0x55c0837c7400] Input link in0:v0 parameters (size > 852x480, SAR 0:1) do not match the corresponding output link in0:v0 > parameters (852x480, SAR 640:639) > [Parsed_concat_0 @ 0x55c0837c7400] Failed to configure output pad on > Parsed_concat_0 > Error reinitializing filters! > Failed to inject frame into filter network: Invalid argument > Error while processing the decoded data for stream #1:0 > Conversion failed! > > I don't know what the (852x480,SAR 640:639) part of the output means, > so I am clueless here. > I would like to create a paste script that can handle these > situations when the existing script using the command on top does not > work. The existing paste script is very fast but it does not > re-encode anything, I believe. > > Any suggestions welcome. > > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
