[Discussioni] VP8 e' libero

[Francesco Potortì]

Federico Bruni:
>> > Notizia di ieri...

Marco d'Itri:
>> Ma pare che sia, tecnicamente parlando, un discreto cesso e nemmeno
>> sicuramente libero da brevetti: http://x264dev.multimedia.cx/?p=377 .

Simo Sorce:
>Se dai credito ad uno sviluppatore di h264 così facilmente ...
>
>Avere un gorilla da 8000 pound dietro un codec "libero" non è niente
>male. E VP8 non è male come codec, non come lo dipinge quel blog afaik.

In realtà non dice che è male, dice che ha prestazioni molto simili a
quelle del profilo di base di H264 e molto migliori di Theora, ed è
vulnerabile ai brevetti quasi come H264.  Le sue conclusioni sono:

================
VP8, as a spec, should be a bit better than H.264 Baseline Profile and
VC-1.  It’s not even close to competitive with H.264 Main or High
Profile.  If Google is willing to revise the spec, this can probably be
improved.

VP8, as an encoder, is somewhere between Xvid and Microsoft’s VC-1 in
terms of visual quality.  This can definitely be improved a lot, but not
via conventional means.

VP8, as a decoder, decodes even slower than ffmpeg’s H.264.  This
probably can’t be improved that much.

With regard to patents, VP8 copies way too much from H.264 for anyone
sane to be comfortable with it, no matter whose word is behind the claim
of being patent-free.

VP8 is definitely better compression-wise than Theora and Dirac, so if
its claim to being patent-free does stand up, it’s an upgrade with
regard to patent-free video formats.

VP8 is not ready for prime-time; the spec is a pile of copy-pasted C
code and the encoder’s interface is lacking in features and buggy.  They
aren’t even ready to finalize the bitstream format, let alone switch the
world over to VP8.

With the lack of a real spec, the VP8 software basically is the spec–and
with the spec being “final”, any bugs are now set in stone.  Such bugs
have already been found and Google has rejected fixes

Google made the right decision to pick Matroska and Vorbis for its HTML5
video proposal.