[FFmpeg-user] video concat without reencoding keeps audio in one order but not the other

[Ulf Zibis]

Am 11.10.23 um 10:38 schrieb Adrian Szatmari:
> So I took a video and cut it two ways, one with reencoding and one
> without reencoding, call them R and C (cut). Im trying to do
> concatenation without reencoding, and I'm able to concat the video in
> all orders <R, R>, <C, C>, <R, C>, <C, R>, but the sound disappears
> for <R, C> and I have no idea why.
>
> I know I can concatenate with reencoding, but my question is
> specifically if someone knows why the sound drops in <R, C> and maybe
> how to fix it. Here is some code in python

Hi Adrian,

I had a similar problem and I found the reason for the problem.

See my thread "No audio in 2nd concatenated part" from today.

-Ulf