jimbotron235, I’ll be eternally grateful for your work on this edit. Now that the 4k HDR version is available I need to convert it to 1080p SDR for my projector as I don’t believe there is a SDR version available for this release - it certainly doesn’t come on Blu-ray.
I’ve been trying ffmpeg to do automatic HDR to SDR conversion with the following, seems to work well:
ffmpeg -init_hw_device vulkan -i INPUT -map 0✌️0 -map_metadata -1 -vf libplacebo=upscaler=spline36:downscaler=spline36:w=1920:h=-1:peak_detect=true:tonemapping=spline:gamut_mode=perceptual:colorspace=bt709:color_trc=bt709:color_primaries=bt709:range=limited:dithering=blue:format=yuv420p -c:v libx264 -preset slow -crf 18 OUTPUT.mkv
Any tips to improve this?
Any sample screenshots? I have not had good results from using ffmpeg or Handbrake for HDR-SDR conversion, but I did think RipBot264 did a good job. The issue I saw was color banding on reds, which only RipBot was able to handle properly.