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What is up with Banding on export?
I exported a Avid Meridien Compressed video codec.
My video has a square block move from the right of the screen to the left, and there is this horrible thick banding, that looks like a real thick interlacing problem that occurs when the box is in motion.
it doesnt look that way when the box is still.what is up?
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6 Replies
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More than likely, this is compression artifacting.
Try exporting your video “Uncompressed”, and see the banding still shows up.
If it doesn’t, then the problem lies in how your compressing your video during export. If you must use the Avid codec try increasing its “Quality” setting, or bit rate ( I don’t use that codec, so this may or may not be possible) Otherwise, I’d consider using a different output codec. I use DV, or HUFFY YUV, depending on the job.
Ethan Anderson
I CAN Learn Education Systems
http://www.icanlearn.com -
Did you scale an interlaced source that did not have fields separated on import?
Did you render with fields, then scale in the output module?Either of those could have caused your problem.
By the way, “banding” generally refers to the situation where a gradient does not appear smooth, but is segmented, sort of like the bands of a rainbow.
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The above definition of “Banding” is what I imagined when I read your post, and I think Steve’s diagnosis of your problem is probably more accurate.
Ethan Anderson
I CAN Learn Education Systems
http://www.icanlearn.com -
Now if someone gave you footage that had multiple thick/thin interlacing, it means that they’ve scaled an interlaced source, and unless you have access to the original, you’re hosed. There’s no recovery from that one.
Once a local post house digitized some D1 footage for me, but they probably thought that because I use After Effects, I wanted a 720×540 movie. So they scaled the interlaced footage up to 540, which created the heinous thick/thin lines.
After I made them aware of their error, they re-digitized the footage at 720×486.
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i took a screen capture of a website.
i added a blue box to it in PSD.
i put the PSD into AE.
I used a camera to zoom in on the box. while this happend the box moved from right to left slightly fast.
the box banded at the left edge causing it to look split into 3 or 4 pieces. kind of like how bricks are layed when building a wall. alternating and hanging over the edge of the other one.
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i exported it again and no problems, but i made my own box in AE with a solid.
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