[FFmpeg-user] Concatenating video cuts - audio gets out of sync...

Michael Koch astroelectronic at t-online.de
Wed Dec 15 15:23:23 EET 2021

Am 15.12.2021 um 14:14 schrieb Bo Berglund:
> On Wed, 15 Dec 2021 13:45:13 +0100, Michael Koch <astroelectronic at t-online.de>
> wrote:
>> You could remove -c copy, but that makes the process much slower.
>> Are you sure that all input videos have the same properties? Same size,
>> video codec, framerate, audio codec, number of audio tracks, audio
>> sample rate?
> They are downloaded using the same ffmpeg download command which sets the video
> size to 480p, like this (variables are set appropriately in the script):
> ffmpeg -hide_banner -referer \"${VIDEOURL}\" -i \"${VIDEOSTR}\" -vf
> scale=w=-4:h=480 -c:v libx264 -preset fast -crf 26 -c:a copy -t ${CAPTURETIME}

That means the audio codec, number of audio tracks and audio sample rate 
could be different.
You should check those videos that don't fit together with ffprobe.


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