[FFmpeg-devel] [PATCH] lavc/hevc_cabac: fix cbf_cb and cbf_cr for transform depth 4

[Fu, Linjie]

> -----Original Message-----
> From: ffmpeg-devel <ffmpeg-devel-bounces at ffmpeg.org> On Behalf Of
> Carl Eugen Hoyos
> Sent: Wednesday, December 11, 2019 18:19
> To: FFmpeg development discussions and patches <ffmpeg-
> devel at ffmpeg.org>
> Subject: Re: [FFmpeg-devel] [PATCH] lavc/hevc_cabac: fix cbf_cb and cbf_cr
> for transform depth 4
> 
> Am Mi., 11. Dez. 2019 um 09:57 Uhr schrieb Linjie Fu <linjie.fu at intel.com>:
> >
> > The max transform depth is 5(from 0 to 4), so we need 5 cabac states for
> > cbf_cb and cbf_cr.
> >
> > See Table 9-4 for details.
> 
> Does this change the output of a file?
> If yes, please provide it / implement a fate test.

Yes, this issue was found in some license-limited clips and does affect the decoding. 
Hence it takes some efforts to generate an available file for verifying/test in the
community.

I've created a ticket for this and attached the clips and the decode result with/without
this patch:
https://trac.ffmpeg.org/ticket/8425

Please help to verify.

Thx,

- linjie