[MPlayer-users] Re: Constant Visual Quality

[Rémi Guyomarch]

On Fri, Dec 13, 2002 at 04:44:22AM -0600, Angel wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > So, if I used vqscale=4 with naq and fairly large values for the
> > masking parameters, I might be likely to see lots of frames using
> > qscale 2,3,4,5,6,7 across different macroblocks as needed, but with
> > the average sticking around 4. However, I haven't actually tested such
> > a setup yet, so it's just speculation right now.
> 
> > Have fun playing around with it.
> 
> Thank you very much for your thorough and well written explanation. I just 
> have one last question. In my experience, the lavc mpeg4 codec seems to have 
> the most problems (visual quality wise) encoding scenes that 1) contain smoke 
> or clouds (this is doubly true for dark scenes) 2) scenes containing large 
> solid color areas.

Yes, I've seen at least two examples of 1) posted here.
Try vqmin=1 and read DOCS/tech/libavc-options about it.

-- 
Rémi