I'm currently having 2 issues with the FFmpeg implementation of 3D LUTs and am wondering if there is any way of fixing the issues.
LUT Range We have some LUTs which are designed to be used over the legal video range (64-940) and some which are designed to be used over the full video range (4-1019). This is important for maintaining details in superwhites and to prevent errors in hue and saturation when changing video from one colour volume to another. Is there a method for flagging if an RGB LUT should be applied over the range 64-940 or 4-1019? Input and output conversions 3D LUTs operate in the RGB domain, but many video formats use the YCbCr domain. Therefore the video processing must look like (simplified): YCbCr video -> YCbCr to RGB -> LUT applied -> RGB to YCbCr -> YCbCr video One use for a 3D LUT is converting from ITU-R BT.709 YCbCr video to ITU-R BT.2020/2100 YCbCr video. The matrices for converting between YCbCr and RGB are different for BT.709 and BT.2020/2100, therefore one needs to flag which colour conversion matrix should be used on the input and output of the LUT. This cannot be estimated based on frame size as 1920x1080 is allowed in both BT.709 and BT.2100. Is there a method for flagging which conversion matrices should be applied before and after the 3D LUT? Thanks _______________________________________________ ffmpeg-user mailing list [email protected] http://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email [email protected] with subject "unsubscribe".
