01-24-2020, 04:07 PM
WarbirdVideos WarbirdVideos is offline
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I ran a test with a test chart graphic in Virtualdub. I output it using Lagarith as an avi. I placed the render back into Virtualdub and rendered it again. I did this 5x. The luminance looks pretty good, but the chroma shifts left with every render.

Is this normal?
Is there a correction filter?
Is this because of 4.2.2 rather that 4.4.4?

I did the same test in Vegas Pro and it shifted more.

Attached Files
File Type: avi Virtualdub - Resolution chart with color - 0.avi (303.5 KB, 23 downloads)
File Type: avi Virtualdub - Resolution chart with color - 5.avi (302.3 KB, 13 downloads)
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Someday, 12:01 PM
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02-03-2020, 08:21 PM
msgohan msgohan is offline
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It's probably due to multiple 4:2:2 -> RGB -> 4:2:2 conversions. There's a reason we always try to process video natively.

You shouldn't be seeing this if you used Fast Recompress mode though.
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02-04-2020, 12:44 AM
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lordsmurf lordsmurf is online now
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In VirtualDub, be sure to change input and output decode modes to YUY2.

Video > Color Dept, or
Video > Decode Format

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02-04-2020, 09:07 AM
ELinder ELinder is offline
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I never noticed that was even an option!
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chroma shift

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