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Well, first off - are you using the Render Queue to make your movie, or are you file/export (don't - use the render queue).
Second, you should use a lossless format if you plan on further editing, such as QT:Animation. DV is a lossy delivery format (similar to VHS, more times you render, worse it will look)
3rd, perhaps it gives you an error because your settings are wrong, although I would have thought it'd give you the error when rendering... What's your comp setting - 720x480?
I export the video (should not be render) - File/Export.
Well, actually the reason that I export the video and then import it back for editing is the problem with swf. Initially, I want to export it to swf directly after changing some color of a background mov clip. However, when I export it to swf directly, the color did not change: and that is why I export it to avi file first and then add it back to AE for swf. - Any suggestion to solve this problem?
And yes, the comp setting is 720X480.
Well, did you take care of your pixel aspect ratios? The AVI may simply be damaged because of of a PAR mismatch (which would hose the DV stream).
What do you mean by taking care fo the pixel aspect ratio?
I have been using 720x480 for both.
DV footage has a pixel aspect ratio of 0.9, not square pixels. If you don't have your comp set correctly, AE will assume it is dealing with square pixels which will ultimately screw DV rendering. This must not necessarily be the case here, but it could. Also check, which DV CoDEc you are exactly using. Some capture devices will install their own stuff, effectively disabling some other routines.
Make sure you do NOT use the File -> Export. Instead, always use the Render Queue!
- Jonas Hummelstrand