There's something weird going on with DNxHD in AE CC 2017 -- can't say exactly what. I am VERY grateful that I can only run AE CC 2015 -- orders from the Home Office, y'know. Others will have to elaborate.
In the meantime, how 'bout JPEG 2000 or PNG? Both compress losslessly and support alpha channels. But it's tough to beat Animation if you're making lower thirds. Because of the large amount of blank screen, the file size can be very compact.
Sorry for this issue. I have heard about similar issues. I have a feeling it has to do with our custom QuickTime Libraries on Windows. Can you please file a bug while I look into this issue?
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The Avid codecs have been problematic many times over the last few years. I've completely abandoned them unless the client specifically requires that format. I use the Cineware 10 bit you can get free from GoPro for most of my DI work (it may be included with AE now but I don't remember). It's visually lossless, 10 bit, supports alpha channels and works on PC and Mac just fine.
On Mac we have the same issue. The Output template says 'Straight', but the render to Avid with alpha is pre-multiplied.
Like Dave said: hard to beat the Animation-codec. Would be great if some open-source-group makes an update to the lossless animation-codec, with support for 16 and 32 bpc.
You can also try Cineform (GoPro), it's 10 bit and works on all operating systems or JPEG 2000, only 8 bit. Both support alphas. Personally I use Cineform all the time for DIs (Digital intermediates)
On Mac there is this problem too.
There is something wrong. After reimport "Straight" Alpha rendered clips are "premultiplied".
It isn't possible to change footage settings. Footage is show "straight" alpha, but changing to premutliplied doesn't help.
The footage looks in every setting faded to black.
We are going to change our workflow to Apple ProRes. Very unsatisfied.
ProRes QT's can work on Avids without conversion to MXF? How so? What Avid settings allow that? I can't keep track of all the Avid settings.
No, there will be a transcoding, because Timeline settings on our Avid are set to AVC-Intra 100.
But we need clips with alpha channel.
Hmmm... that's how my Avid's set up too, and I use alphas all the time.
I make Quicktimes in the proper dimensions & frame rate, straight alpha channel, Animation codec. I just drag 'em into a bin, and Avid does the rest -- I just tried it.
A couple of warnings -- you can NOT have an audio track on the animations. Doesn't work that way. You will be forced to choose between having an alpha with no sound, or having sound but no alpha. And if you don't see "Creating Video Fill" first as your non-audio-track alpha channel animation imports, there's a setting wrong in Avid someplace. Good luck finding it.