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Post #677537

Author
drngr
Parent topic
High-End video capture cards
Link to post in topic
https://originaltrilogy.com/post/id/677537/action/topic#677537
Date created
13-Dec-2013, 1:59 PM

I've found that the Luma Ramp pattern on DVE interacts with the ATI 750 USB's AGC, but it isn't immediately visible to the naked eye the way that some problematic non-DVD sources apparently are. With the help of a scope filter, this test may be useful as an easily-distributable check. That said, it doesn't trigger a really bad capture device I have that's triggered by a lot of other DVD content, so it certainly isn't foolproof.

Test results with ATI 750 USB:

  • From black, the pattern's contrast gradually drops over 5 seconds.
  • From white, the pattern's contrast gradually drops over 3 seconds.
  • From grey, the pattern's contrast gradually drops over 5 seconds.

TestAGC.iso (RAR, 92KB)

Avisynth script to produce the visualizations: TurnRight().Histogram().TurnLeft()