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I can not EXPORTAT flv (rgb + alpha)

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Felipe DiazI can not EXPORTAT flv (rgb + alpha)
by on Oct 20, 2009 at 3:46:48 pm

Day greetings to all, I am writing to ask for help with an issue that is getting me gray hairs. I'm trying to export some videos in flv format for inclusion in an animation Flash, But I need that videos have alpha channel, I made a chroma in after CS4 and when I go to export, It shows only activated Las channel options (rgb) and (alpha) but not the need (rgb + alpha) Do not know if I'm missing some codec or something, Can someone help.


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Todd KoprivaRe: I can not EXPORTAT flv (rgb + alpha)
by on Oct 20, 2009 at 4:17:20 pm

from "Render and export a composition as an FLV or F4V file":

"To include the alpha channel in the FLV output, use the On2 VP6 codec and select Encode Alpha Channel in the Video tab of the export settings dialog box."

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Todd Kopriva, Adobe Systems Incorporated
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Justin BuserRe: I can not EXPORTAT flv (rgb + alpha)
by on Jan 21, 2013 at 6:03:52 am

I do this but it exports as yuv + alpha, not RGB, do you know how I might export to rgba?


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Todd KoprivaRe: I can not EXPORTAT flv (rgb + alpha)
by on Jan 23, 2013 at 3:09:14 am

The On2 VP6 codec (the video codec used for FLV) encodes color data as YUV. It does not use RGB.

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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Justin BuserRe: I can not EXPORTAT flv (rgb + alpha)
by on Jan 24, 2013 at 2:11:58 pm

Right... I clearly was already aware that the output was YUV, however VP6, Sorensen(sp?), or whatever codec is used isn't the issue. FLV is a container, not a codec, the issue is how do I make it encode what it says it's encoding? I'm assuming that if the only possible output was YUV then the encoder would say YUV + Alpha, however it quite specifically says RGB + Alpha, so I'm guessing there must be another codec available that I don't have or something.



When I export to Uncompressed AVI and select RGB + Alpha, it outputs RGBA as expected. I also have the the Color Management output profile set to sRGB, which seems to do nothing. I don't understand what the point of even having the option to choose an output format is if just ignores your choice and does what it wants...


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Todd KoprivaRe: I can not EXPORTAT flv (rgb + alpha)
by on Jan 26, 2013 at 12:19:35 am

I can see how that is a bit confusing, but the actual sense of the RGB+Alpha is that these are the channels that are being output from After Effects render phase and being read by the encoder.

I'll submit a bug report, though, noting that the current UI isn't clear.

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Todd Kopriva, Adobe Systems Incorporated
After Effects quality engineering
After Effects team blog
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