[MPlayer-users] Re: mencoder/crop => image distortion

[Jonathan Rogers]

D Richard Felker III wrote:
> I'm not sure it's possible -- it may be a limitation of dshow. The
> aspect from the mpeg4 header is only available after the first video
> frame reaches the decoder, and I think dshow expects aspect to be
> initialized *before* that. Early versions of mplayer had a similar
> issue with width/height/etc. when correct values couldn't be obtained
> from the container header, only from the actual video stream. That was
> fixed with the (very complicated, but also very powerful and flexible)
> vf init/config system.

Yeah, I suspected it might be a limitation of dshow. ffdshow does 
seem to allow the user to change the aspect manually on the fly. 
I'll try it again to make sure.

Jonathan Rogers