On Mon, Apr 03, 2017 at 07:50:07PM +0000, Ben Chang wrote: > Hi, > > This patch adds copy of HDR VUI info from decode ctx to encode ctx. > Currently, information under colour_description_present_flag (eg. colour > primaries, transfer_characteristics, matrix_coeffs) do not get copied to > output stream when trancode happens. > > Testing performed: > ffmpeg.exe -y -hwaccel cuvid -vcodec hevc_cuvid -i input.h265 -vcodec > hevc_nvenc output.h265 > Ensure the output bitstream contains the same colour_description_present_flag > fields as input. > > Also attaching previous discussion on this subject. > > Thanks, > Ben > > ----------------------------------------------------------------------------------- > This email message is for the sole use of the intended recipient(s) and may > contain > confidential information. Any unauthorized review, use, disclosure or > distribution > is prohibited. If you are not the intended recipient, please contact the > sender by > reply email and destroy all copies of the original message. > -----------------------------------------------------------------------------------
> ffmpeg.c | 3 +++ > 1 file changed, 3 insertions(+) > 8a8befe4fc47b7279b15d655e39b12ca36be4bc2 HDR_transcode_VUI_copy.patch > From c8092bc538ba7ae32357ca166e67809eb3705f60 Mon Sep 17 00:00:00 2001 > From: Ben Chang <b...@nvidia.com> > Date: Mon, 27 Mar 2017 17:00:19 -0700 > Subject: [PATCH] Allow transfer of HDR-required VUI info from dec ctx to enc > ctx > > --- > ffmpeg.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/ffmpeg.c b/ffmpeg.c > index 532db80..1ef2906 100644 > --- a/ffmpeg.c > +++ b/ffmpeg.c > @@ -3239,6 +3239,9 @@ static int init_output_stream_encode(OutputStream *ost) > dec_ctx = ist->dec_ctx; > > enc_ctx->chroma_sample_location = dec_ctx->chroma_sample_location; > + enc_ctx->color_primaries = dec_ctx->color_primaries; > + enc_ctx->color_trc = dec_ctx->color_trc; > + enc_ctx->colorspace = dec_ctx->colorspace; These should at a minimum check the encoder and decoder use the same pixel format, otherwise these details are more likley wrong than right if they arent passed through avfilter in some form [...] -- Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB It is dangerous to be right in matters on which the established authorities are wrong. -- Voltaire
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