[MPlayer-users] Slow encode of wmv

[Reimar Döffinger]

On Sat, Apr 12, 2008 at 05:29:49PM -0400, Patrik Dufresne wrote:
> Hi,
> 
> I want to encode a
> 
> I'm a new user to mplayer and I want to encode a .wmv (Microsoft Windows 
> Media 9 video) video file with h.264 codec. I use the folowing command 
> line to do the job. It's work, of course, but it's really slow (2.04 
> fps). Also I receive a lot of "31 duplicate frame(s)!" error.

[...]
> If I add the argument -ofps 30.0 the process run normally with 22.4 fps 
> and there is no more duplicate frames.
> 
> Does any body can explain me the reason why mencoder behave like that?

WMV is variable-framerate, which neither MPlayer nor AVI support, and
thus is treated as 1000fps video, so if you do not specify -ofps,
mencoder (probably) encodes 1000 frames per 1 second video.