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vMIX AVI is imported with wrong Gamma in Premiere Pro
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andreypetr  
#1 Posted : Wednesday, May 20, 2020 4:38:42 AM(UTC)
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I've become obsessed with the idea of recording 4K footage with vMIX. Well, it turned out to be a complicated task.

The main problem is the choice of a lossless codec. Earlier vMIX guides recommended using MagicYUV for recording. I compared both MagicYUV and vMIX AVI. Magic is faster when editing, better quality, but takes a ton of space and it's paid. vMIX AVI is free and great if you have limited storage.

VLC doesn't play such files, but Windows Media Player do. All colors, gamma, and brightness show as they should. But the real problem is a mismatching Gamma when you import vMIX AVI files to Premiere. The image gets way over brightened.

By moving gamma from 10 to 14, and increasing exposition by 1, I was able to get somewhat similar image. But it's not identical to the source.

If WMP plays video as it was recorded, then I guess there is a problem with vMix AVI importer or Adobe Premiere itself. Am I the only one experiencing this problem?


Comparison image
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thanks 1 user thanked andreypetr for this useful post.
Miuccia on 5/24/2020(UTC)

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Miuccia  
#2 Posted : Sunday, May 24, 2020 10:43:30 PM(UTC)
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I second this issue. It seems like Premiere incorrectly assumes the file lies within the 16-235 limited color range - or something like that


I'm not an expert in this matter, but for me it was resolved by putting the Levels filter on the video with
(RGB) black input level: 16
(RGB) white input level: 235
And then it looked OK. However, i'm afraid that by applying this conversion I might lose some color depth information, and that's not OK. I hope this bug can be fixed.
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a.basso  
#3 Posted : Sunday, May 24, 2020 10:51:13 PM(UTC)
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We experienced the same issue during a recent production. We solved the problem quite simply, by processing the files encoded with vMix AVI codec using the vMix Media Converter tool.

The output is a .mov file encoded in ProRes, which can be imported in Premiere with perfect gamma.
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admin  
#4 Posted : Monday, May 25, 2020 12:33:37 AM(UTC)
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Hi,

For others experiencing the issue, expanding the levels from 16-235 will preserve the full quality of the recording
as YUV is 16-235 anyway.

We will work on a more permanent fix in the next update.

Regards,

Martin
vMix
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Miuccia  
#5 Posted : Monday, May 25, 2020 12:57:52 AM(UTC)
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Thank you Martin! As always, good work!
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