[FFmpeg-user] Intent of -copyinkf and non-key frames in video stream copy
Carl Eugen Hoyos
cehoyos at ag.or.at
Sat Apr 20 21:30:14 CEST 2013
Doug Handy <doug <at> doughandy.com> writes:
> If there is no initial key frame generated, what is
> the value of using this option to include non-keyframes?
> I'm trying now to understand the potential uses for the
> -copyinkf option.
If your input video does not start with a keyframe,
the option allows you not to start stream copying
with the first keyframe (this is the defaul
behaviour), but with the first frame of the
input stream (no matter if it is a keyframe or
If you really want to know "why", please be assured
that for every option (of the huge number FFmpeg
provides) a user has once requested it.
(In the specific case of -copyinkf, it is also
useful if you want to copy subtitles that are for
some reason not marked as keyframes, but this is
more a work-around than a feature.)
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