In attempt at speeding up hdr10 4k HEVC video playback I tried to re-encode it into AVC-intra using this guide: https://www.voukoder.org/forum/thread/1163-replicate-sony-s-xavc-i-s-format/ basically either ffmpeg -i input -c:v libx264 -avcintra-class 480 -pix_fmt yuv422p10le -preset ultrafast -x264opts avcintra-flavor=sony -c:a pcm_s24le -ar 48k output.mxf or for half size ffmpeg -i ~/K38_sdcard1/Documents/iPhone11_4K-recorder_59.940HDR10.mov -s 1920x1080 -c:v libx264 -avcintra-class 200 -pix_fmt yuv422p10le -preset ultrafast -x264opts avcintra-flavor=sony -c:a pcm_s24le -ar 48k output-half.mxf Note, line errors out when I tried class 480 for 1920x1080 frame size Both files load into cingg Original file (4k hdr hevc, 59.94 fps) plays at around 22 fps at output x11, project rgba-float. But seeking is sad. Not to mention lack of tonemapping. First 4k avc-intra 4k reencode plays at around 33 fps and seeks much better (no artefacts) 1920x1080 proxy plays at 60 fps, and if I check play every frame and try 2x speed forward - at 83 Fps. But trying two FullHD tracks referencing same "proxy" file set to different fade leves with project set to RGBA-float kills fps back to 2-3 :) Encoding at ultrafast preset was 4.5 fps for 4k version and 12 fps for FullHD version. Filesizes: du -h *.mxf 1.0G output-half.mxf 2.2G output.mxf this is just for frame= 1149 time=00:00:19.15 Well, I guess without some serious GPU upgrade this machine not gonna play HDR 4k :) Regular 8 bit/SDR 4k somewhat plays in firefox (if file just av1, 24 fps), at least on Linux where I can set GPU frequency a bit higher than default on nouveau/libre drivers.