[FFmpeg-user] Missing frames when using ffconcat

[Marton Balint]

On Wed, 18 Oct 2017, Thomas Howe wrote:

> Hi all,
>
> I'm working on a project that requires ff.concat files to be interpreted
> accurately, but every other frame in my 50fps project goes missing (is
> filled in with the previous frame instead). I think this might be related
> to ffmpeg's default 25fps, but I can't find the command to make it work
> properly.
>
> Here's the command I'm using:
> ffmpeg -i test-video/list.ffconcat -vf fps=50 -c:v libvpx-vp9 -pix_fmt
> yuv420p test-video/video.webm

Have you tried forcing the input frame rate insted? E.g.:

ffmpeg -r 50 -i dummy.ffconcat

Or do you want to specify different durations for different images?

Regards,
Marton