It should be fixed in AE CC with the new native DNxHD support, but as you say it still can happen and i have also seen it.
The file you have a problem with, has that been exported from Avid MC with the 'same as source' setting? In my case i think it was a file exported with 'same as source' but the timeline had mixed dnxhd resolutions, some dnxhd120 and some dnxhd36. Avid will happily export an QT with both inside.
If this is the case for you, then ask the avid editor to force a render to one dnxhd resolution by unchecking the 'same as source' setting and manually set the output options.
I dont know if this is the problem but i will do some test exports when i get back from my vacation some time in august :-)
Another new 'bug' with DNxHD in AE CC is that you cant anymore import compressed alphas from QT wrapped DNxHD files. Isn't anyone else bothered by this? :-(
More important though is that you CAN write compressed alphas, just not import them back in :-)
- Robert
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