[FFmpeg-user] Missing frames when using ffconcat

Thomas Howe tho7maspenguin at gmail.com
Wed Oct 18 03:12:25 EEST 2017

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

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

And attached is a script (requiring imagemagick to run) that generates
input frames, an ffconcat file, runs the above command, and extracts the
created video's frames for analysis.

Thanks in advance,
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