[FFmpeg-user] Missing frames when using ffconcat

Carl Eugen Hoyos ceffmpeg at gmail.com
Sat Oct 21 21:59:40 EEST 2017

2017-10-18 2:12 GMT+02:00 Thomas Howe <tho7maspenguin at gmail.com>:

> 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

Complete, uncut console output missing.

> And attached is a script (requiring imagemagick to run)

(Is there a reason FFmpeg cannot generate the input frames?
Maybe a missing feature?)

Carl Eugen

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