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Have you tried decreasing the Maximum RAM cache size, or increasing the Maximum Memory Usage, or both?
How much RAM does your system have?
What is the resolution of your comp?
What is the source format and CoDec? To what format are you outputting?
I've got 2.49gb of RAM, I've tried to render it to MPEG, AVI, MOV and MPG-4. Screen resolution is 1204- 768. I have tried to decrease the Maximum RAM cache size and increase the Maximum Memory Usage.
I changed the camera from 20mm to a 28mm camera and it solved it. Is there any reason why a 20mm camera would have problems rendering?
A shorter focal may encompass more pixels due to the stronger spherical distortion, resulting in a larger buffer. This is even true if visually it looks identical to a longer lens.
A simple Google search for "image buffer"
gives you my tutorial on how to avoid this as the first hit:
The size of the buffer that cannot be allocated will give you a clue. Is it the same size as the composition, or the size of a nested composition? If the size is much larger than all compositions, it's usually a Blur effect that must allocate a buffer that is bigger. Try lowering the amount of blur and add several blur effects on top of each other to get the same look.
- Jonas Hummelstrand
I got the same error message, took away all blurry effects and unnecessary transparency, then it worked.