[MPlayer-users] Problem Encoding Solid Color Objects With LAVC MPEG4

[Corey Hickey]

rcooley wrote:
> 
> The best was the beginning scene on the "There's Something About Mary" 
> DVD.  I uploaded a sample to /incomming, and have since deleted the 
> files.  Either mencoder is corrupting keyframes, or the motion 
> compensation is introducing a lot of errors (more likely).  Just about 
> anything with a complex picture, where the whole screen is panning, will 
> give a good example.

Well, I can't test your file, but I can say that I've never run into any
quality mishaps recently, with the exception of a long, chaotic scene on
my The Two Towers DVD that the ratecontrol didn't like. After asking on
ffmpeg-devel, I added vratetol=100000, and that fixed the problem.

Though, I haven't messed around with different lavcopts in a long time;
maybe an option you're using is messed up, or something, or I'm using
something that happens to work around a problem. What lavcopts are you
using? If you want to try mine, just for kicks, here they are.

vbitrate=800:vcodec=mpeg4:mbd=2:v4mv:trell:precmp=3:cmp=3:subcmp=3:\
vmax_b_frames=1:qpel:vlelim=-2:vcelim=7:lumi_mask=0.05:naq:vqcomp=0.7:\
mbcmp=2:vpass=1

-Corey