[XviD-devel] Xvid v's H.264/AVC

[Daniel Larkin]

Thanks Christoph for clarifying a number of matters.

If Xvid is a mpeg4-asp implementation does this mean that Xvid is
constrained by all the patenting issues of MPEG-4 (mpegla etc)?

I'm also curious about your comment:
> The same for
> QPel (e.g. for MPEG-2 input like DVDs it's known not to help not much, if
> at all).
Is this because the lossy compression is reducing the performance of the
interpolation process?

Regards
Daniel

> -----Original Message-----
> From: xvid-devel-bounces at xvid.org [mailto:xvid-devel-bounces at xvid.org]On
> Behalf Of Christoph Lampert
> Sent: 06 July 2004 13:22
> To: xvid-devel at xvid.org
> Subject: Re: [XviD-devel] Xvid v's H.264/AVC
>
>
> On Tue, 6 Jul 2004, Daniel Larkin wrote:
>
> > Xvid Experts,
> >
> > Firstly sorry for the newbie-ness of this question, but:
> >
> > I was wondering how does Xvid compare against say 1) H.264/AVC
> Baseline/Main
>
> can't say anything about that. But with AVC being the "successor" or
> MPEG-4, a good implementation should beat XviD.
>
> > 2) MPEG-4 SP in terms of compression, visual quality and complexity?
>
> XviD is MPEG-4 Advanced Simple Profile, and a rather good implementation
> of it. Since XviD of course also has all features of Simple Profile (in a
> rather good implementation), you can simply check yourself, but encoding
> with XviD twice, once without B-frames, without GMC, without QPel. And
> once with them, or rather, a good combination of them.
>
> If you really do, please post the results, since I guess we're always
> interested in such benchmarks as well.
>
> The difference between SP and ASP in compression, visual impression and
> speed depends quite much on the input material. There are some
> clips where
> B-frames do wonders, and some where they don't help at all. The same for
> QPel (e.g. for MPEG-2 input like DVDs it's known not to help not much, if
> at all). GMC hardly ever helps, and it computationally very expensive.
> I know that there are reports that ASP has X dB gain over SP in PSNR, or
> saves Y% in bitrate, but those are not reliable. It depends on the input
> too much.
>
> gruel
>
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