[FFmpeg-devel] [PATCH] avcodec/dnxhddec: Do not overwrite colorspace if the container has set it.
michael at niedermayer.cc
Thu Nov 30 03:41:25 EET 2017
On Tue, Nov 28, 2017 at 04:49:46PM -0800, Steven Robertson wrote:
> The existing logic overrides container metadata even in cases where the
> container metadata must be trusted (e.g. HDR). The original spec had no
> provision for specifying color volume, so many files rely on the
> assumption of Rec. 709.
> An update to the spec included a 'clv' field for explicitly signaling
> that the container should be trusted in an existing bitfield in the
> frame header, but the default of 0 from old encoders forces Rec. 709,
> which would break any HDR stream. Because there is no place in DNxHR for
> specifying a transfer function, DNxHR HDR files must include
> container-level color information.
> This patch maintains the existing behavior of choosing the 709 over the
> 601 matrix when container-level information is missing, and allows
> container-level information to win if present.
> Signed-off-by: Steven Robertson <steven at strobe.cc>
> libavcodec/dnxhddec.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
> diff --git a/libavcodec/dnxhddec.c b/libavcodec/dnxhddec.c
> index f46e41a456..6f8c716412 100644
> --- a/libavcodec/dnxhddec.c
> +++ b/libavcodec/dnxhddec.c
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Why not whip the teacher when the pupil misbehaves? -- Diogenes of Sinope
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