How do I make a trimmed video show the missing frames from a Zoom recording using ffmpeg?
Every time I concat, I quickly run it thru this awesome little freeware from Mean beforehand, avidemux, (MP4 Muxer-&gt;Move index to the beginning of the file-&gt;Save) and it fixes the majority of any concat issues I've run into. Not sure if it will fix your issue, but it can't hurt and somewhere down the line avidemux will come in handy and fix a concat issue if you're having one. Shoutout to Mean for such a helpful piece of freeware!