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Question: Using an 8 bit codec with HDR content may affect video quality

I am trying to export HDR for YouTube in Compressor from FCPX 10.4 and I keep getting this warning. "Using an 8 bit codec with HDR content may affect video quality". But it is was shot on Panasonic VLogL at 10bit and was setup in FCPX as wide gamut. Can anyone tell me why I am getting this warning and how to fix it?

iMac (Retina 5K, 27-inch, 2017), macOS High Sierra (10.13.2), 32 Gb Ram, 8 Gb Video

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Dec 17, 2017 6:14 AM in response to W. Harrison Stone In response to W. Harrison Stone

The problem is not with hoe the clips were recorded but how they are being exported. It seems that you are exporting using the youtube destination and probably that will create an H264 file. I am guessing that this is where the 8bit limitation is showing.

Dec 17, 2017 6:14 AM

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Dec 17, 2017 8:26 AM in response to Luis Sequeira1 In response to Luis Sequeira1

YouTube now supports HDR. I have tried both doing this through the Compressor directly to YouTube and that is where the warning shows and sharing as a master file at ProRes 422HQ which is surely 10 bit. Also the exported file, looks very different from what I see in the viewer of FCPX and I am assuming that is because my iMac is not HDR.

Dec 17, 2017 8:26 AM

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Dec 30, 2017 11:05 PM in response to W. Harrison Stone In response to W. Harrison Stone

This seems like a glitch, or a constant warning regardless of the bit depth that is used. I get the same thing using 10-bit 422 HLG footage (.MOV) from the Panasonic GH5. FCPX reads the footage as 2020 HLG in the metadata. How in the world can that be considered an 8-bit video file?

Dec 30, 2017 11:05 PM

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Dec 31, 2017 12:46 AM in response to Tom Wolsky In response to Tom Wolsky

It’s not 8-bit and yes, it’s true FCPX doesn’t display the bit depth, but it does display the color profile of the gh5 .mov files. The color profile shows as Rec. 2020 HLG. Those files are 10-bit 422 HLG from the gh5. Should not be getting an 8-bit file warning.

Dec 31, 2017 12:46 AM

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Dec 31, 2017 9:40 AM in response to Tom Wolsky In response to Tom Wolsky

I'm getting the same thing within FCPX .. export to YouTube. You can see from the screenshot that it's set to Wide Gamut - Rec. 2020 HLG .. for YouTube. The warning shows up when exporting to YouTube, Vimeo, and Apple 4k devices.

User uploaded file

Dec 31, 2017 9:40 AM

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Dec 31, 2017 9:51 AM in response to patrick6111 In response to patrick6111

The YouTube preset is H.264, and it does not use a format that's 10-bit capable. You need to export either a ProRes 422 HQ or higher file from FCP, or use Compressor creating an HEVC 10-bit preset. Be warned HEVC 10-bit is really, really slow. Your choice: large high res file with long upload, or small file with longer encode.

Dec 31, 2017 9:51 AM

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Dec 31, 2017 10:02 AM in response to patrick6111 In response to patrick6111

I have no idea if it's going to be changed. Probably not for some time as the vast majority of content on YT is still H.264. Currently there is very little HDR generated output, and far, far fewer HDR capable displays. 4K HDR 10-bit honestly seems pretty pointless on an iPhone X screen.

Dec 31, 2017 10:02 AM

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Question: Using an 8 bit codec with HDR content may affect video quality