[FFmpeg-user] fixing videos that don't start with keyframes

[Roger Pack]

> Just to follow up on this, ffmpeg *is* successfully removing the leading
> non-key frames.  This does *not* seem to be the case when using '-acodec
> copy -vcodec copy' (which doesn't surprise me).  I just ran something like
> 'ffmpeg -i my_video.mpg -target ntsc-dvd my_fixed_video.mpg' and the leading
> non-key frames were gone.

with -ss 0 it "might" skip to the first keyframe with vcodec copy.  Maybe?
-r