[MPlayer-dev-eng] vf scale and yuv vs. rgb

[D Richard Felker III]

On Fri, Apr 23, 2004 at 04:57:32PM +0200, Michael Niedermayer wrote:
> Hi
> 
> On Friday 23 April 2004 16:20, Sascha Sommer wrote:
> > Some people still have problems with mplayers performance on windows. Most
> > of the time
> > this is caused by video cards without yv12 support. In this case vf scale
> > will jump in and
> > convert to bgr32 instead of yuy2. The problem is caused by the fact that
> > scale goes through
> > its output format list and queries the vo for these video formats. In the
> > outfmt list rgb/bgr comes
> > before yuv so it will always select rgb/bgr before yuv when both have hw
> > support (VFCAP_CSP_SUPPORTED_BY_HW). What bould be the best solution to fix
> > this?
> > I propose to move the yuv formats before the bgr formats in the outfmt
> > list. Better ideas?
> > Michael?
> agree
> 
> the IMHO correct (and difficult) fix is to pass quality&speed values around 
> and find the highest quality + const*speed path ...

IMO you should just always convert to the _closest_ format that's
supported by the output. First consideration should be same
subsampling, second same colorspace, third same bit depth.

Rich