Forums > Jitter

jit.window inverted image bands problem

Mar 10 2009 | 6:45 pm


I’m having a problem using jit.window in fullscreen mode when my display resolution is set to 1920×1080.

The video gets chopped into 32 horizontal slices that are displayed from bottom to top, making the image look inverted. Although each slice displays video right side up.

I’m using Max 5.0.6, Windows XP Home and an integrated ATI Radeon HD 3200 GPU with an HDMI connection to a BenQ E2200HD LCD monitor.

The problem happens when the input to the jit.window is a ( 1920 1080) or a (jit.qt.grab 1920 1080) and the jit.window is in full screen with a display resolution of 1920×1080. I have also been able to recreate the problem by reading a 1920×1080 video with a ( 480 320) not in full screen, although in that case there were only 2 and a half horizontal bands.

I would be very grateful if anyone could reproduce this problem or find a solution to it!

Thank you


Mar 10 2009 | 7:58 pm

best way for us to reproduce is to send us a stripped down patch which demonstrates the problem. paste it into the forum using Edit->Copy Compressed.


Mar 10 2009 | 9:16 pm

— Pasted Max Patch, click to expand. —
Mar 16 2009 | 4:44 pm

Has no one experienced or been able to reproduce this?

Mar 16 2009 | 6:56 pm

I can’t reproduce here, but it sounds like it is a driver, rather than a Jitter issue, since it doesn’t happen on other HW combinations. First thing I would suggest is to update your drivers and see if it persists. Here’s the link to the latest official ATI driver for your setup (XP Home Catalyst 9.2 driver)


Mar 17 2009 | 1:26 am

Hi, thanks for your help. I’ve updated the drivers but the problem still persists. Are there any settings in the display driver control panel, or in Max that could be changed to solve the problem, or any other ideas?

Thank you

Mar 21 2009 | 4:24 am

Actually, after some testing, it seems that the issue I am experiencing is much more general than the situation I described in my first post. Whenever a jit.window’s height is equal to the height of it’s input, the image is chopped into bands…

While writing this I have done more investigating and it seems the problem only occurs when the interp flag is set to 0, which is the default. Setting the flag to 1 seems to solve the problem for now.

I would be interested in an explanation to this strange behavior, if anyone has one.

Thank you

Mar 22 2009 | 3:21 am

Does it look somewhat like the picture here:

I have also experienced a multi-banding problem when working in very high resolution screen modes.

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