[FFmpeg-user] Extract all keyframes

[Carl Eugen Hoyos]

Moritz Barsnick <barsnick <at> gmx.net> writes:

> ffmpeg shouldn't be duplicating anything by itself.

If the input is vfr but the output format only 
support cfr, frames will have to be duplicated and 
this is the default behaviour (A/V sync would be 
impossible otherwise).

In any case, the complete, uncut console output 
will explain the issue.

Carl Eugen