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AVID DNxHD render, alpha not right
When I render an AE composition that has an alpha to Avid’s DNxHD codec with an alpha, the alpha is comes out full screen black (or white if inverted) & not based on the alpha from the AE composition.
My Output Template for AVID DNxHD 10bit +K Straight is:
Format Options:
Compression Type: Avid DNxHD Codec
Depth: Millions of Colors+
Quality: Best
Options:
Color Levels: RGB Levels
Resolutions: 1080i/59.95 DNxHD 220 10-bit
Channels: RGB+Alpha
Depth: Millions of Colors+
Color: Straight (Unmatted)What is up with this?
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3 Replies
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You might need the latest codec pack from Avid.
You might need to actually configure the Avid codec itself, and toggle the option for alpha. Add your comp to your render queue, click on the Output module settings to choose QT, click format options to choose the DNxHD codec and tick the option for compressed or uncompressed alpha.
According to the codec readme. Alpha’s in Avid’s codecs should be imported with “use existing” rather and “invert existing” which is used for non-avid codecs (i.e. QT animation).
Oh…and just be sure that your comp actually contains transparency…Erik
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My codecs from Avid were from March 15th, 2007, there are apparently newer ones out as of January 8th, 2008 — AvidCodecsLE_1.8MAC.zip. I updated to that collection and now the alpha that is put out by after effects is correctly based on the comp’s alpha.
Thanks,
-C -
I was wondering if you can tell me what version of Mac OSX you are using or were using when you installed these codecs. I had a load of pain with After Effects and the 1.8 codec but I think I installed it incorrectly. I’d just be happier knowing what set up you had so I can make a judgement on installing it on my machine. I have the same problem in that I need to output an alpha and can’t at the moment.
all the best
richard
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