[MEncoder-users] Video Filters on YV12 Raw Stream

[Jarred Nicholls]

On Wed, Dec 16, 2009 at 6:14 AM, Jarred Nicholls
<jarred.nicholls at gmail.com>wrote:

> Certain video filters (scale, expand) are having no effect on a YV12 input
> stream (e.g., mencoder video.yuv -vf scale=640:480 -o video2.yuv -ovc raw).
>  The rotate filter works fine, but the scale doesn't act the way it normally
> does and neither does expand.  Can anyone enlighten me as to why this is?
>  Is there a workaround to have those two aforementioned filters (scale,
> expand) work appropriately?  Scale, for example, will scale it down to the
> same height as the scale filter's input, but then fix the width to keep the
> original aspect ratio.  Note, I've noticed this is the way mplayer's filters
> work all of the time on any input.
>
> Thanks for your help,
> Jarred
>

I take that back...it is scaling it as expected, mplayer is just prescaling
it when playing it back.  Sorry.  I'm having a heck of a time running raw
video through filters and muxing it through ffmpeg in the end :-)

Jarred