[Linphone-users] VP9 experimental release

[Karl Schmidt]

I'm thinking that VP9 (open and royalty free) might be a game changer (similar 
performance to H265):

Imminent release? :

From 
https://groups.google.com/a/webmproject.org/forum/#!topic/webm-discuss/UzoX7owhwB0
(see Jun 12)

> Paul Wilkins Jun 12
>
> Here is the latest VP9 status update.
>
> As of last night the VP9 (profile 0) bitstream is FINAL and the process of 
> validating it on
> multiple platforms and in different build environments and testing for 
> submission into Chrome is
> under way.
>
> The last few days have been pretty hectic as we had to make several last minute 
> changes. As
> always seems to be the case, these were more complex than we had hoped and I 
> want to thank the
> whole team for working long hours to bring about closure. I also want to thank 
> partners and
> hardware vendors who have submitted comments and suggestions over the past few 
> weeks.
>
> Details of the final issues resolved over the last 7 days are as follows:-
>
> Changes to the loop filter. Changes to make the loop filter more HW friendly 
> had to go through
> several iterations and gave rise to a couple of late bugs. As is often the 
> case, initial attempts
> to make it more hardware friendly turned out to make things more difficult in 
> SIMD software
> implementations. Hopefully the final solution is a comfortable compromise for 
> both.
>
> Changes to the way compound prediction modes are coded in the bitstream. Though 
> not conceptually
> complex and necessary to correctly constrain the allowable compound prediction 
> modes, this change
> touched a lot of files and getting it done on time and debugged was a Herculean 
> effort by those
> involved.
>
> Definition and implementation of behaviour at the edge of images. This relates 
> to what prediction
> modes/sizes and transforms are allowed near the edge of an image that does not 
> break down nicely
> into 64x64 blocks. I mentioned this at the summit and while it sounds simple, 
> like all the
> simplest changes, it was actually quite hard to get right. Again a big thank 
> you to all involved
> in working through the issues.
>
> Some minor changes to the frame header (E.g. coding of frame size not needed 
> for all frames)
>
> Some minor changes to the entropy coding of some symbols and some updates to 
> the default tables.
>
> Paul Wilkins



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