[x264-devel] Re: tiles

[Loren Merritt]

On Fri, 30 Sep 2005, reamer-s at Safe-mail.net wrote:
> On Fri, 30 Sep 2005, Loren Merrit wrote:
>> Just note that slice-groups (needed for any shape other than raster scan)
>> are allowed only in baseline and extended profiles.
>
> My application is for encoding HD up to 1080i.  What is the impact of 
> these profile restrictions?

It means you can't use CABAC or 8x8 transform, which add quite a lot of 
compression (together 15% bitrate or so).

>> And no matter what, you'll still lose some quality because inter blocks
>> can't predict MVs from across the slice border.
>
> If the tiles each cover a relatively large portion of the frame does that help?

If the tiles are large (especially at 1080i), then the bitrate lost to 
border effects is comparatively small.

--Loren Merritt

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