[MPlayer-users] Re: funky newbie problem

[Michael Waters]

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.