[x265] Max TU Size

[Steve Borho]

On 10/23, Nicolas Morey-Chaisemartin wrote:
> Quick question about the max TU size.
> It used to be something like
> tuQTMaxLog2Size = MIN(5, maxLog2CUSize)
> 
> Now it is simply maxLog2CUSize -1.
> It makes no difference for 64x64 CTU but it tends to worsen quality (or increase bitrate) for smaller CTU sizes.
> 
> Is this a wanted behaviour and if so, why?

I don't remember this change being made. The MIN() made sense, since
transforms can't be 64x64. I would be ok returning the old behavior.

-- 
Steve Borho