On Jun 2, 2007, at 10:35 PM, Jeffrey C. Ollie wrote:
> On Fri, 2007-06-01 at 18:32 -0400, Mihai Balea wrote:
>>
>> Theora does not support packetization
>
> Not true:
>
> http://svn.xiph.org/trunk/theora/doc/draft-
ietf-avt-rtp-theora-00.txt
Well, actually it is true. The codec itself does not have
any built
in support for arbitrary size chunks. When you use Theora,
all you
can get is complete encoded frames that usually are too big
to be
sent in one network frame. The xiph draft arbitrarily
slices up the
full frames into usable, network sized chunks. The downside
is that
if one or more such chunks are missing or are miss-ordered,
nasty
things happen leading to the entire frame being useless. We
use a
similar technique in iaxclient and we decided that it is
better, from
a user experience point of view, to drop an entire frame
rather than
display an incomplete one.
Compare to H.264 which does have built in packetization and
is
resistant to lost or miss-ordered packets.
>
>> and it is, unfortunately, the
>> only free (as in beer and speech) video codec.
>
> Untrue as well:
>
> http://dirac.sourceforg
e.net/
> http://schrodinge
r.sourceforge.net/
Last time I checked, about 6 months ago, Dirac wasn't ready
for
realtime encoding/decoding use. The algorithms appear
promising, but
they really need to optimize their code.
Mihai
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