[x265] [PATCH] add support for Monochrome color space (X265_CSP_I400)

[Steve Borho]

On 09/21, Steve Borho wrote:
> On 09/21, Steve Borho wrote:
> > # HG changeset patch
> > # User Steve Borho <steve at borho.org>
> > # Date 1442853618 18000
> > #      Mon Sep 21 11:40:18 2015 -0500
> > # Node ID 9eaf43c0d001706bce9ae8d287e3ec104208749f
> > # Parent  57f027dfb3088eabef5f442be2a2e38fb0d4052f
> > add support for Monochrome color space (X265_CSP_I400)
> > 
> > This patch was extracted from changes made by Fabrice Bellard for BPG
> 
> Note that Fabrice has added monochrome to an x265 fork that is kept
> under the BPG source, and this patch back-ports those changes to the
> mainline tree under the x265 dual license.
> 
> BPG is only using I and P frames and so we will need to do some
> validation to determine which features are compatible with 4:0:0 and
> then disable/prevent/or fix those features which are not compatible.
> We'll also need to add some monochrome clips to the automated tests.
> 
> BPG uses monochrome for both greyscale images and for the optional
> fourth (alpha) channel. http://bellard.org/bpg/

And just to be clear the back-port was done at Fabrice's request.

-- 
Steve Borho