Comments on: How to convert HDR video to SDR with ffmpeg https://www.binarytides.com/convert-hdr-video-to-sdr-with-ffmpeg/ News, Technology, Entertainment and more Thu, 09 Nov 2023 02:15:21 +0000 hourly 1 https://wordpress.org/?v=6.8.2 By: Will C https://www.binarytides.com/convert-hdr-video-to-sdr-with-ffmpeg/comment-page-1/#comment-362504 Thu, 09 Nov 2023 02:15:21 +0000 https://www.binarytides.com/?p=15677#comment-362504 Hi! This is great! Can you help put together a guide for using QSV and tonemapping hdr to sdr? I’m really struggling!

Here’s what I have right now that works:
ffmpeg -init_hw_device qsv=hw -filter_hw_device hw -i input.mkv -vf zscale=transfer=linear,tonemap=clip,zscale=transfer=bt709,format=yuv420p,scale=1280:-2 -vcodec h264_qsv -map 0:v -map 0:a:0 -map 0:a:1 -c:a copy -map 0:s:0 -c:s copy outputfile720p.mkv

What this is doing:
1)UHD HDR hevc source
2)Tonemapping
3)Scaling to 720p
4) Encoding to h264
5) Copying the first two audio tracks and the first subtitle track using the map function. I have to map video as well or else it fails.

This correctly tonemaps, and I can tell via intel_gpu_top that some gpu is being used, but the filter is not going through qsv.

Bonus question: I can’t get global_quality to work, how does that work with -vcodec h264_qsv

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