I've got an HD project containing a precomped canvas of 7000x4000px on an alpha channel. As it's colour corrected, it's obviously chewing up a lot of processor power in previews.
So I want to prerender it, and have done composition>Pre-render. I'm keeping the settings as standard from AE, but once it's rendered out, I'm getting the error "'Dubai comp.mov' cannot be imported - this 'MooV' fle is damaged or unsupported".
Can anyone explain why this might be? It opens fine in QuickTime and FCP (albeit slowly due to its size), and the file extension in Finder is definitely not '.MooV'
I had come across your Stock Answer #1, and hadn't thought it through too much... Then I realised I'm using XDCAM HD & EX, which I think are based on mpeg-2?
Strangely I don't have these sorts of problems when re-importing HD renders of the final project, only the very big canvas with alpha channel...
In any case that makes a good deal more sense now. Thanks for your help. Unfortunately since I have vast amounts of archive footage to deal with, re-compressing it all isn't an option this time round, but it's helpful for future reference. Thanks again.
Try rendering to an image sequence instead - PSD, PNG, TIFF, and TGA all support transparency.
Other big benefits of image sequences include the ability to re-render only a portion of an animation if you make changes; the ability to easily resume failed renders, and cross-platform portability.
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