[vorbis] Video codec

[Sean Wieland]

Ralph Giles wrote:
> 
> Well, at this point, I think you're better off buying a net-accessible
> jukebox; while the DVD format is ugly, it doesn't make any more sense to
> transcode DVD->Ogg than it does to transcode mp3s, unless you're also
> seriously downsampling (e.g. for internet distribution).

Well, I was thinking more along the lines of reasonable storage
considerations.  At least 5GB per DVD is a bit harsh.  Whereas .5GB per
OGG-Video means plenty of room on one of those new 80GB hard drives for
a good-sized movie collection in addition to a good-sized CD collection,
all of the regular apps, games, etc.

> As far as streaming goes, we can use ogg for http streaming just as we can
> use it for local files. To do things "properly" (RTP), one doesn't
> want ogg, but I imagine we can work out an equivalent "application
> profile" with the same substreams and features.

I meant as in high-quality low-bitrate (40 and 100kbps) http streaming.

> Streaming video is never going to work without (at least!) a broadband
> connection. Chad's estimates are that the current design can be pushed to
> a factor of 2 or 3 better than MPEG-1, which will allow the VHS quality
> movie on a CD (loosely defined) claimed for MPEG-4 (around 1.5 Mbps).
> I have no hope that we're going to get DVD-quality video under the limits
> of broadband connections. As far as that goes, I expect we'll just
> be another contender in the Real/QuickTime/ASF battle.

I'm talking about 352x240 resolution VHS-quality streaming video at
about 100kbps.
I agree that DVD level resolution and quality without broadband would be
extremely difficult (as in near impossible).  Although DVD resolution
and quality at about 1Mbps for archive on CD would be nice.

> > Also, where is the MNG/tarkin source code?  Where exactly is the
> > development status?
> 
> The mng reference implementation (beta) is available at libmng.com.
> There's currently no code for ogg integration. This would be pretty
> simple, if you're looking for something to do. :)
> 
> It has been alleged that the tarkin test source will appear in the
> 'tarkin' cvs module, but it's not there yet. AFAIK, there's never been a
> public release, though Jack recently described the algorithm. See the
> ensuing discussion for immediate followup ideas:
> 
>   http://www.xiph.org/archives/vorbis-dev/1329.html
> 
> Cheers,
>  -ralph

Thanks,
-Sean


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