pablo.morales at abitab.com.uy
Sat Apr 3 13:26:28 CEST 2004
Well, it seems that xvid uses more bits than libavc, good, I use
bitrate=1600 and ended up using 1400, compared to libavc with a vbitrate of
1800 and just used 950, anyway, that' was not what I wanted, I wanted a
1.4G file and not a 1200, anyway, I'l increase the audio bitrate anyway to
increase the file size to fit in the CD, because it seems that quality
cannot be inproved much more than that. I tried scaling from 512x384 and up
to 720xXXX, but the same result.
But after all, with xvid I improved a bit more the quality, the weird thing
is that with some DVD I can use whatever bitrate I want and end up with a
3GB file size if I want, so..
----- Original Message -----
From: "D Richard Felker III" <dalias at aerifal.cx>
To: "MPlayer usage questions, features, bugreports"
<mplayer-users at mplayerhq.hu>
Sent: Saturday, April 03, 2004 1:14 AM
Subject: Re: [MPlayer-users] xvid
> On Fri, Apr 02, 2004 at 10:25:50AM -0800, Loren Merritt wrote:
> > The reason (I infer) that XviD can fill any desired bitrate, and lavc
> > can't, is that XviD supports quantizer 1 (-xvidencopts
> > min_iquant=1:min_pquant=1). lavc has a vqscale=1 (constant quantizer),
> > doesn't respect vqmin=1 in 2-pass encodes.
> You need lmin too. Then it should work fine.
> > Despite what the lavc entry in the manpage says about quant 1 making
> > little quality difference, XviD with min quant 1 looks much better than
> > lavc when lavc maxes out with quant 2 at 800kbit/s (and I am encoding at
> > unscaled dvd resolution).
> If you're using 800kbit/sec, quant 1 is useless. It will just waste
> more bits on frames that already look perfect and then your other
> frames will get higher quantizers.
> In fact, 800kbit/sec is so low for full DVD resolution, that I'd be
> surprised if any quantizers come out less than 4 or 5, and most are
> probably 7-9 or higher!
> The key to good quality is proper cropping and scaling, not using full
> DVD res...
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