[x265] Possible bug: Chrominance planes shifted when saturation is low

[Deepthi Nandakumar]

Thank you for the heads-up. We are seriously investigating a chroma bug
seen as color speckling (reproducible with Tears of Steel, 4k at 16-bit
build), at medium with cqp=45. However, any consistently reproducible test
case , especially at 1080p is welcome.

Pls let us know if there is more info.

Thanks,
Deepthi


On Thu, May 1, 2014 at 3:57 PM, Mario Rohkrämer <contact at ligh.de> wrote:

> Here is a report about encoded material with very low brightness and
> saturation, especially at the edges, and the chrominance is shifted away
> from the luminance, to the right.
>
> http://forum.doom9.org/showthread.php?p=1679520#post1679520
>
> I hope the reporter will be able to upload a sample to investigate if the
> issue is in the encoding or decoding part.
>
> But one line in the report makes it suspicious:
>
> +----
> And then i encoded with default settings (encoded a Yuy file and manually
> told it the resolution 1920x1080, other than it was as is).
> +----
>
> If he entered a different resolution for x265 than the YUV file really
> has, the shift is no surprise...
>
> No panic yet. Just be aware.
>
> --
>
> Fun and success!
> Mario *LigH* Rohkrämer
> mailto:contact at ligh.de
> _______________________________________________
> x265-devel mailing list
> x265-devel at videolan.org
> https://mailman.videolan.org/listinfo/x265-devel
>
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