[MPlayer-users] Re: funky newbie problem

[D Richard Felker III]

On Thu, Dec 05, 2002 at 03:07:01AM -0500, Michael Waters wrote:
> [Automatic answer: RTFM (read DOCS, FAQ), also read DOCS/bugreports.html]
> On Thu, Dec 05, 2002 at 02:37 -0500, D Richard Felker III wrote:
> > > If you're using lavc, checkout the vrc_override option in the manpage
> > > that allows for specified quality for specific frame ranges.  I haven't
> > > tried it yet but I've noticed lavc produces very blocky images with
> > > some isolated scenes... moving water, lots of movement in the whole
> > > frame, dissolves when the light changes a lot...
> > 
> > Your advice is correct, but shouldn't be needed if the rate control is
> > working well. Try increasing vqcomp to 0.8
> 
> tried this, as well as other values
> 
> > increasing vratetol to
> > 500000 or so, 
> 
> this too
> 
> > and possibly turning on (at least minimal) single
> > coefficient elimination thresholds.
> 
> by this you mean vlelim & vcelim, right?  tried the values suggested by
> you and Remi Guyomarch
> 
> > Also read the other threads here
> > about optimal encoding parameters.
> 
> I have.  No improvement really.  Only increasing the bitrate from 800
> kbps to unusable bitrates (for example to fit a 100min movie in 700mb)
> like 1500 kbps helps.
> 
> I uploaded a sample of one bad spot to /incoming a while back and
> mentioned it here.  There's also several seconds of landscape shots
> near the beginning of the 'Witness' dvd (with Harrison Ford) that lavc
> made blocks of even at 2000 kbps.  I don't have the disk anymore but
> I'd be willing to get it and upload clips if someone would look at it
> to improve lavc.  Although I think lavc is generally better looking
> ...sharper, brighter, cleaner, at the same bitrates... i've found xvid
> to be better at encoding the 'problem scenes' with lots of movement or
> changes in light and have been using it instead.

Hmm, I guess for now you should use vrc_override with qscale=1 for
those frames that are causing trouble... Hopefully someone will figure
out what's wrong before too long and provide a fix.

Rich