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AVID Codecs 2.3.9 for Windows has no Alpha?
I’m running Windows 7 with AVID’s codecs, version 2.3.9, and no matter what combination of settings I set in After Effects, I can’t get a quicktime file with an alpha channel. I’ve made sure to set RGB+Alpha as well as selecting either “compressed” or “uncompressed” in the Avid codec dialogue box. However every time I export a file using an Avid codec, no alpha channel comes through. I can get an alpha channel with any other codec ie: jpg2000, animation, etc.
Anyone else having this issue? Is there a bug in this version?
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7 Replies
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I don’t believe Avid Codecs support alpha.
Ricky
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The do support alpha.
Make sure you have millions + and not millions of colors selected.
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Thanks for the prompt reply’s! Just to make sure I’m not going insane, I took screen grabs of what I’m doing with the result. They show me creating a simple comp, setting to Millions+, and adding the alpha in the Avid codec box. After rendering, the file has no alpha channel. The attached pics show exactly what I did. Am I missing something?
Result:
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I believe “Unmatted” is what you want but you might try matted – That was what stumped me when going to Avid…but I also used a different codec because I thought I read DNxHD did not support alpha from AE – glad to hear from John that they do – I will need to experiment now!
Ricky
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We use DNxHD codecs with all our work coming out of AE and it works with alpha. The 444 codecs are for RGB projects. Try a DNxHD resolution that is not 444, unless you are working in an RGB project.
Mark Renz
Senior Editor
Outpost Worldwide -
Great tip! It worked using DNxHD 220 8 bit with an uncompressed alpha channel. That will work for now, but I’m still curious about why I can’t get a 444 codec exported with an alpha? I really prefer to have everything coming out of AE as uncompressed as possible since it will ultimately get compressed at least 1 or 2 more times by final delivery.
Thanks for the help!
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There is a 10 bit version of 220 to use.
Mark Renz
Senior Editor
Outpost Worldwide
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