On Mon, Oct 3, 2016 at 11:35 AM, Ali KIZIL <aliki...@gmail.com> wrote: > Hello, > > This patch is done for performance increase on UHD or above resolution > color space convertions. > Some SDI sources provide yuv422p10 for 10bit source and uyvy422 for 8 bit > source. > To encode these sources with NVENC 10 bits, there is a need to convert > these color spaces to P010. > > Before patch for UHD and above resolutions, convertion could not exceed > ~25-30 fps, which can not be used for a 50 fps encoding. > This patch fixes this problem. > > Also, color space convertion speed for 10bit YUV422P to 8bit YUV420P is > having the same problem. > If anybody wants to encode 10 bits source in 8 bits for UHD or above > resolutions could not achive high frame rate ratio as well. > This patch also fixes this problem. > > I think it will be good to apply this patch to avoid performance loss in > high resolutions. >
These conversion functions butcher quality by using only every second row of chroma for 422 -> 420 conversions without any interpolation, and they don't dither for 10->8 bit conversions. Not sure its a good idea to do that, even more so without an option to defeat these low-quality variants with the swscale flags. - Hendrik _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
