anyone have any idea on how to solve this?
Don't use IFF?! These issues are well-known and have plagued AE from the day it was born. Seriously, your workflow is simply not the best. IFF simply is not a robust format and a single damaged byte can render files unusable plus over the years Autodesk have hacked around a lot with the format, so it's a veritable mess. You really should not be using it. For the current situation convert it through fcheck or free tools like XnView.
thanks, i know it is an old issue, i thought there could be some progress in that issue.
iff is a very nice format, you get rgba with lossless compression that gives you small files to handle. tga is what i use to workaround but this gives me much bigger files.
i have to try other formats to see what can be a good replacement.
what do you use?
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Could you Zip up and send me a small .iff sequence that will reproduce the file format error you are seeing?
After Effects Quality Engineering
I sent you 50fr by email.
Thanks a lot for looking into it
after some more testing it looks like the problem occurs when i add quicktimes with h264 compression to the composition, the bigger the files, the more times it happens.
Until then the iff sequences work without any issues.
i'll keep posting info's
so this issue as been replicated by Paul, who submitted it as an official bug.
Let's hope it can be fixed easily.
And in the meantime, I think the easiest workaround will be to transcode your .IFF footage to another lossless format that supports an alpha channel.