[x265] Can x265 suppourt setting tu size in cmd line for dealing with ring effect?

[Steve Borho]

On Wed, Dec 4, 2013 at 4:00 AM, <idxa at sina.com> wrote:

> Hi,
>
> It is to be found that x265 make more ring effect with default options
> especially in low bitrate.
> Perhaps it is caused by TU size.
>
> I have done some tests with the following options,
> x265.exe --input chineseIdol_832x464_25.yuv --recon Ido_832x464_6411.yuv
> -o Ido_832x464.hevc --input-res 832x464 --fps 25 --crf 31 --frame-skip 300
> --frames 100 --tu-intra-depth 1 --tu-inter-depth 1 --ctu 64
>
> Here ctu size is changed from 64 to 16, combined
> with --tu-intra-depth,--tu-inter-depth (1,1) and (3,3)
>
> The result shows "ctu==64, tu-intra-depth=1, tu-inter-depth=1" has much
> more ring than "ctu==16, tu-intra-depth=3, tu-inter-depth=3".
>
>
> Please see the graph,left is "ctu==64, tu-intra-depth=1, tu-inter-depth=1"
> and right is "ctu==16, tu-intra-depth=3, tu-inter-depth=3".
>
> Can x265 suppourt setting tu size in cmd line like HM of
> QuadtreeTULog2MaxSize and QuadtreeTULog2MinSize?
> thank,
> idxa
>

QuadtreeTULog2MaxSize and QuadtreeTULog2MinSize are currently set to the
max and min CU size.  See encoder.cpp:1274

For video with text or subtitles, you will probably see benefit from
enabling transform skip as well.

-- 
Steve Borho
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