Re: [MEncoder-users] -ss seek position?

On Mon, 9 Jun 2008, jthompson wrote:

> mencoder -ss 00:00:00 -endpos 00:00:05 -nosound -ovc copy
> SOURCE_FILE.mpg -of mpeg -o OUT_FILE.mpg

> The behavior is quite odd. With start / stop :00/:05 mencoder returns
> 5.005 secs and 150 frames writtenm, :01/:05 returns the same 5.005 secs
> and 150 frames, :02/:05 returns 4.505 secs and 135 frames, :03/:05
> returns 3.505 secs and 105 frames, :04/:05 returns 3.003 secs and 90
> frames and :05/:05 returns 2.002 secs and 60 frames. My .mpg test clip
> is only 6 seconds but I have tried longer clips.

The -ss option isn't all that well documented. At best, I believe it can
only seek to the nearest keyframe. If you need better resolution, the
only choice appears to be to write an EDL file and use -hr-edl-seek
(though not with -ovc copy unless the input is raw or MJPEG or some other
format where every frame is a complete picture).
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