[FFmpeg-devel] [PATCH]lsws/utils: Make gray10 and gray12 full-scale like gray8 and gray16

[Ronald S. Bultje]

Hi,

On Tue, Apr 4, 2017 at 8:01 AM, Ronald S. Bultje <rsbultje at gmail.com> wrote:

> On Tue, Apr 4, 2017 at 6:33 AM, Carl Eugen Hoyos <cehoyos at ag.or.at> wrote:
>
>> I believe attached patch makes FFmpeg a little more consistent with
>> itself.
>
>
> Looks like it, yes.
>
> This patch does expose a bug we've discussed before though. Since the
> return value of handle_jpeg() is or()'ed into src_range and dst_range, it
> overwrites an explicit zero range requested by the user. So If my input is
> a h264 grayscale file with color_range in VUI explicitly set to MPEG-range,
> I believe swscale does the wrong thing and the output color will be
> distorted.
>
> (This is orthogonal to your patch, but may be worth of a trac ticket.)
>

Was the ticket created? This is a fairly important bug.

Ronald