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I recently bought a GH5 and I played around a little with Hybrid Log Gamma (HLG). Because I haven't settled to buy the studio version of Davinci Resolve, I have to convert my mp4s before working with them.
What I usually do is something like ffmpeg -i "input.mov" -c:v prores_ks -profile:v 3 -c:a copy "output.mov".

Now I ask myself if I loose the advantage HLG gives me, because to my understanding, I'm converting a very special colour space into another one and I'm not sure that ffmpeg picks it up automatically. The converted clips look good so far though, as far as I can tell on my cheap screen (using the scopes of course to verify the highlights don't burn out etc.).

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  • I don't see anything in that command that changes the colorspace. Prores 4444 isn't a colorspace. Your footage is going in as HLG and coming out as HLG, as far as I can tell (I'm not the resident FFMPEG expert, though.. You'll lose something by transcoding, but you can't do much better than what you're doing. When you do get the studio version, you should A/B using scopes; you probably won't be able to tell the difference - well, unless something gets messed up like video/data levels or quicktime metadata flags. – Jason Conrad Aug 20 '20 at 12:02

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