[MPlayer-users] Re: Constant Visual Quality

[D Richard Felker III]

On Mon, Dec 16, 2002 at 06:08:41AM -0600, Angel wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> > I've seen reports of this before, but it's never happened to me. My
> > best guess is that you're trying to encode with too low a bitrate, and
> > scenes before the smoke/clouds/fog are very complex and cause the rate
> > control code to consume more bits than the average bitrate you
> > requested, then it has to compensate later by encoding the scenes
> > you're talking about with way too few bits. Could you perhaps provide
> > some more examples (uploading them to mphq would be fine) or try
> > encoding the relevant scenes with vqscale=2 or 3 and see if that looks
> > good?
> 
> > BTW, one way to improve quality of specific scenes is to use the
> > vrc_override lavcopt to specify your own qscale for particular ranges
> > of frames. But if there really is a general problem, it should be
> > fixed in lavc so that this isn't necessary in the future.
> 
> > Rich
> 
> I've uploaded part of American Pie 2 which looks very blocky even when encoded 
> with a vqscale of 2. I've seen this in a number of movies I've encoded but 
> this is by far the worst example. The filename is american_pie_2.avi and is 
> in the incoming directory on mplayerhq.hu.

Is this the file you encoded, or a copy of the source material? I'll
take a look later when I get a chance but I'm out of town right now
and so it's harder to test these things.

Rich