[MEncoder-users] Newbie question

[Reimar Döffinger]

On Wed, Dec 30, 2009 at 10:04:31AM +0100, Reimar Döffinger wrote:
> On Tue, Dec 29, 2009 at 05:10:43PM -0700, Ender wyvern wrote:
> > Vielen Dank, herr Doeffinger! The culprit was indeed the default 4:4:0
> > sampling factor in ImageMagick. Adding a -sampling-factor 4:2:2 option (to
> > ImageMagick, not MEncoder) fixed it.
> 
> With the commandline you use you are encoding to 4:2:0 in the end
> anyway, using 4:2:2 for the JPEGs only makes them larger than necessary,
> ImageMagick needs to do pointless chroma interpolation and MPlayer
> needs to do chroma scaling, and probably you'll also end up with lower
> quality due to all those conversions.
> Use 4:2:0 or add support for 4:4:0 in MPlayer (I think that should be
> rather simple, mostly adding it to libmpcodecs/imgfmt.h and
> fmt-conversion.c).

It was a (little) bit more effort, but MPlayer now supports 4:4:0
format, so converting before shouldn't be necessary anymore.