Resolution problem

[keith2045]

I am ripping my dvds and using virtualdubmod to encode them to xvid. I have a problem though, some movies i can encode with a resolution of 700x whatever, but others i have to get really small, like 550x whatever. I get an error when i try to encode them with a bigger resolution. The error code is:

"Cannot start video compression:

An unknown error occured (may be corrupt data). (error code -100)"

But when i try to encode that video to a smaller resolution it works. Anyone know why?

[jagabo]

That error usually happens when you have frame dimensions that the output codec doesn't like. For Xvid you should always use a multiple of 2 (ie, use even, not odd numbers). Multiples of 16 are even better.

[keith2045]

Thanks, the 16 multipler worked.

[keith2045]

Does that go for all video formats? Because 2.35 aspect ratio wont allow me to use 688x293.

[jagabo]

Most codecs require at least a power of 2. Most lossy codecs use 16x16 blocks during encoding so multiples of 16 usually work best.

[giannid]

Try 688x288 - both numbers are divisible by 16. You won't notice the difference between that and 688x293.

[keith2045]

oh right i forgot about that 2 thing.