[XviD-devel] RGBA 32Bit input format

[Luca Piccarreta]

Actually our codec (commercial, TILAB) supports Shaped video,
(and OBMC :). And I suppose that there must be other reasonably fast
codecs that do as well... But nonetheless I dind't hear of any widespread
application of shaped video coding out there, not in the free, nor in the
commercial domain.
Profile & Levels specification of MPEG4 seems to have killed anything
that goes beyond ASP.
Perhaps this is also due to the fact that shaped video can find two
reasonable applications:
1) Storage of binary (or gray) sequences for Video Editing.
2) Object Based Coding
The first one might seem reasonable, given the applications commonly used,
while the second one.... Tools for MPEG4 System support are at this moment
not very complete, even considering the best applications. (I'm thinking
mostly
of encoding tools!)
For pete: feel free to contact me, even for just an exchange of opinions.
Luca Piccarreta (TILAB consultant)


----- Original Message ----- 
From: "suxen_drol" <suxen_drol at hotmail.com>
To: <xvid-devel at xvid.org>
Sent: Wednesday, June 11, 2003 2:09 PM
Subject: Re: [XviD-devel] RGBA 32Bit input format


> On Wed, 11 Jun 2003 13:43:07 +0200 "Florian Schaper"
<fschaper at zerodegree.de> wrote:
> > Hello,
> >
> > is it possible (or planned) to have 32Bit input for the XVid codec so
you
> > could use 8Bit alpha masks in AdobeAfterEffects or their like? I
understand
> > that in most cases it is sufficient to have 24Bit but I'm in desperate
need
> > of an codec supports alpha masks (like the huffyuv codec) _and_  that
has
> > good compression rate .
>
> hi.
>
> xvid supports bgra input, but ignores the alpha channel.
> whilst mpeg4 does support alpha channel coding, xvid doesnt support
> alpha encoding/decoding. iam unaware of any mpeg4 codec that supports
> alpha (or obmc for that matter...).
>
> -- pete
>
>
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