[Fatal bug?] Rec.709 attribute is missing after export

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Vit Reiter

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[Fatal bug?] Rec.709 attribute is missing after export

PostFri Aug 30, 2019 10:51 am

After export to ProRes HQ "transfer_characteristics BT.709" is missing.

Exports from DaVinci 16.1b1 were ok.
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Vit Reiter

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostTue Sep 03, 2019 11:35 am

I have found that if I set Managed Output Color Space to anything other than Rec.709 Gamma 2.4, the Transfer Characteristics attribute is included in the video export.

If I want Transfer Characteristics = Rec.709, I change Output Color Space to Rec.709 (Scene). See figure.
I still talking about ProRes, BT.709 video.


Maybe it will help someone before the Blackmagic bug fixes.
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Rohit Gupta

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostTue Sep 03, 2019 3:33 pm

This is an intentional change. We are tagging the files as 2.4 gamma to make the QuickTime Player show them correctly.
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Cary Knoop

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostTue Sep 03, 2019 3:57 pm

Rohit Gupta wrote:This is an intentional change. We are tagging the files as 2.4 gamma to make the QuickTime Player show them correctly.

Good move!
That will avoid a lot of "my video looks different when I export from Resolve" situations. :)
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Jean Claude

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostTue Sep 03, 2019 4:41 pm

Rohit Gupta wrote:This is an intentional change. We are tagging the files as 2.4 gamma to make the QuickTime Player show them correctly.


No more QT with Windows? Can you confirm if it is also applicable?
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Vit Reiter

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostWed Sep 04, 2019 12:06 pm

Rohit Gupta wrote:This is an intentional change. We are tagging the files as 2.4 gamma to make the QuickTime Player show them correctly.
I understand your effort, but the Transfer Characteristics attribute is necessary for further processing in television and film pipelines. The technicians are returning videos as damaged with the message that there is no Transfer Characteristics in Color Space!

Even the QC tool Interra Baton does not detect this attribute. Without the Transfer Characteristics attribute, you cannot use the video to make a package to the iTunes Store.

This is the wrong way. I did a test and QuickTime Player or macOS Quick Look still show a different picture result than DaVinci.
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Rohit Gupta

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostWed Sep 04, 2019 1:26 pm

Vit Reiter wrote:
Rohit Gupta wrote:...
This is the wrong way. I did a test and QuickTime Player or macOS Quick Look still show a different picture result than DaVinci.


Are you on 10.14.6 which is the minimum required? Older macOS has bugs due to which the color management will not work properly.

You should be able to render as 709 gamma I think as well and that should produce 709 transfer characteristics. Just don't choose 2.4 gamma.
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Vit Reiter

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostThu Sep 05, 2019 12:19 pm

Vit Reiter wrote:I did a test and QuickTime Player or macOS Quick Look still show a different picture result than DaVinci.
Rohit Gupta wrote:Are you on 10.14.6 which is the minimum required? Older macOS has bugs due to which the color management will not work properly.
Hmm, I did a test on macOS 10.14.6 and QuickTime Player still show a different picture result than DaVinci.

Can Somebody confirm that picture in QuickTime Player is the same in DaVinci?
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Joern Friedrichs

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostThu Nov 14, 2019 2:42 pm

Hi there, yes i can confirm. Looks like resolve 15 writes an quicktime atom "transfer characteristics" BT.709 to the rendered files. All files exported by resolve 16 are missing this atom. I guess this is why quicktime shows darker colour. The files reimported to resolve are looking ok and also imported to premiere for example. So the color data is correct. It is a viewing problem. And our whole company is going nuts because they cannot send the files to our customers.

And yes we are on the latest version of macos 10.14.

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Joern Friedrichs

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Re: [Fatal bug?] Rec.709 attribute is missing after export

PostThu Nov 14, 2019 2:45 pm

Sorry, verything was said before. I should read before writing. :roll:

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