On Monday, March 11, 2019 10:50 PM Vittorio Giovara vittorio.giov...@gmail.com wrote:
>On Mon, Mar 11, 2019 at 12:50 AM Sun, Jing A <jing.a....@intel.com> wrote: >I just searched my inbox again but failed to find that email of question you >mentioned. > >Yeah I often see my mail bounced with this message: > >Address not found >Your message wasn't delivered to jun.z...@intel.com because the address >couldn't be found, or is unable to receive mail. >For reference this was the message on the mailing list >https://ffmpeg.org/pipermail/ffmpeg-devel/2019-March/240663.html > >Could you please elaborate your request? What is the preservation for and how >is it expected to work? > >Yes of course, when you encode an HEVC stream you should be able to >signal how the color properties of the video buffers should be >rendered. This is usually conveyed with three parameters, the matrix >coefficients, the color primaries and the transfer characteristics. Without >such information, the data stored in the video may be interpreted differently >and often incorrectly by modern video players, causing image degradation, >wrong rendering and off colors. >For HEVC they are usually expressed in the stream itself, under the VUI, and >it is kinda expected that modern encoder allow to set them to any of the >applicable values. >In ffmpeg-land, they are represented by the colorspace, color_primaries and >color_transfer options in AVCodecContext and carried over through the whole >video processing. >-- >Vittorio Hi Giovara, SVT HEVC has the interface to enable/disable sending a vui structure in the HEVC bitstream, but supports no interface for setting the color properties before encoding yet. I will be opening an issue in SVT HEVC github asking if they have plans to add such feature, and will keep you posted. In the meantime, I think it is not blocking the first version of this plugin’s merging , is it? In SVT HEVC user guide: "VideoUsabilityInfo - Enables or disables sending a vui structure in the HEVC Elementary bitstream. 0 = OFF, 1 = ON" Regards, SUN, Jing _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
