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afterdawn.com > forums > archived forums > divx / xvid > what's causing the squares?
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What's causing the squares?
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InitialX
Newbie
_ 		14. August 2006 @ 18:47 _ Link to this message    Send private message to this user   
The video starts at a pretty good quality, but at the end scene where the boat is speeding across waters, quality starts to lose and causes all these squares.

Picture: http://www.stickied.net/files/c9c50cf6b3782dc08c7b2e0dc6621d9b.png

Am I encoding it bad is it something to do with my graphic card? Playing the original dvd works fine.

I'm using XviD and VirtualDub mod for creating the AVI. In virtual dub mod, I've set the filter mode to bicubic (A=-0.75).

Edit: I'm converting a dvd to AVI.
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This message has been edited since posting. Last time this message was edited on 14. August 2006 @ 19:03
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celtic_d
AfterDawn Addict
_ 		14. August 2006 @ 19:56 _ Link to this message    Send private message to this user   
You actually upsized to that resolution with black bars?

Common practice to encode credits at a lower quality using zones, although I would hope that you would remember if you did that. Still a little more detail of your process might help. Like you are doing two passes? Also I wouldn't recommend using VDub to resize and if you are upsizing, I wouldn't recommend resizing at all. Encode at the original DVD resolution instead.
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InitialX
Newbie
_ 		14. August 2006 @ 20:05 _ Link to this message    Send private message to this user   
I'm using single-pass and resizing a 720x480 to 640x360. And I've cropped out the black bars.

The picture you saw wasn't the actual size, i put it in full view.

I've tried doing a 2-pass but it asks me for a statfile which I'm not sure about.
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This message has been edited since posting. Last time this message was edited on 14. August 2006 @ 20:06
celtic_d
AfterDawn Addict
_ 		15. August 2006 @ 04:32 _ Link to this message    Send private message to this user   
The stats file is created by the first pass and used in the second. You can't jump straight to the 2nd pass without doing the first first.

I wouldn't recommend single pass unless you are encoding at a fixed quant.

Also 640x360 is not mod16. Using non mod16 resolutions makes the codec less efficient.
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This message has been edited since posting. Last time this message was edited on 15. August 2006 @ 04:33
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InitialX
Newbie
_ 		15. August 2006 @ 15:43 _ Link to this message    Send private message to this user   
what do you mean non mod16? what would be a correct size? is there a guide on this?
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