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Old 28th April 2021, 21:48   #1  |  Link
mikeiz
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VirtualDub2 4:2:2 YCbCr capture of P210-709 format colors not right

I captured the video using a Magewell Pro Capture HDMI 4K+ adapter using VirtualDub2 build 44237. The video colors look correct in Overlay mode. I capture to an AVI file setting the format to P210. When opening the file in Virtualdub2, it is detecting in the Decompression format P210-709, but the colors are not right. Any ideas on what's going on?

Last edited by mikeiz; 29th April 2021 at 00:17.
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Old 29th April 2021, 00:18   #2  |  Link
poisondeathray
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How are the "colors are not right"?

You expect colors to be slightly shifted because vdub uses rec601 for the RGB conversion for it's preview by default. The actual underlying YCbCr video is not affected , unless you do something (e.g. apply a RGB filter) that actually requires a conversion to RGB

If you want to preview what it would look like for a 709 preview, add the "alias format" filter . Don't forget to disable it when actually using vdub2 for encoding
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Old 2nd May 2021, 11:16   #3  |  Link
shekh
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Quote:
Originally Posted by mikeiz View Post
When opening the file in Virtualdub2, it is detecting in the Decompression format P210-709
This is suspicious, the AVI output from capture never included any color properties, moreover it is never detected from capture source as well.
And the AVI decoder does not detect colorspace too. Maybe you just have the "709" preference in decode format turned on?
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