[MEncoder-users] Any experts? MEncoder places chroma in wrong field...

Reimar Döffinger Reimar.Doeffinger at stud.uni-karlsruhe.de
Fri Dec 14 12:22:43 CET 2007

On Fri, Dec 14, 2007 at 02:44:32AM -0800, B.P. wrote:
> After lots of experimentation, I discovered the apparent solution to
> this mystery - changing "-vf scale=704:480" to "-vf scale=704:480:1:0".
> That completely resolved the problem for ordinary DVD player viewing.
> But it caused the issue to begin occurring with software playback (in
> VLC and MPC)!  http://img266.imageshack.us/img266/2950/vlccap2av8.png

Better make the screenshots with MPlayer, it is a bit much to expect for
anyone here to know both mencoder and VLC code/chroma scaling behaviour.
But without special handling, all software players are only suitable for
playback of progressive content, you will have to a deinterlace, in
MPlayer e.g. with -vf yadif - though in this particular case -vf tfields
may be more helpful.
As to ilpack: you should compare ilpack=0 and ilpack=1 , but probably
that it fixes display and reduces chroma probably has the same
underlying reason, namely that it averages chroma between the two fields
in the default mode.

Reimar Döffinger

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