Alpha channel video makes for a larger-than-target bitrate flv

I'm looking for some information regarding the final bitrate of alpha channel encoded video. We are producing transparent flvs. When targeting a number, say 200kbps, in Adobe Media Encoder, the final encoded flvs has a bitrate of sometimes as high as 350kbps or 400kbps. And that's just the video.
When I encode without the alpha channel with final flv video bitrate is basically exactly what I targeted.
I'm assuming GSpot and MediaInfo to look at the final flvs.
Why doesn't Media Encoder produce and flv at the target bitrate? Why the higher bitrate? Is there a way to set the final target for an flv? Is there better software?
Thanks,

Since the lounge is for non-technical discussions, you need to start at
http://forums.adobe.com/community/premiere and select the forum for the product you are using
I will GUESS you are using some flavor of Premiere Pro, so that is most likely where you should post

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Probably because you're not actually encoding "nothing" when creating transparency. An alpha channel is an additional 8-bit grayscale channel, and it probably can't or isn't compressed as much as the RGB channels, or else the transparency would not be clean. The only way to decrease the file size is to lower the total bitrate, which will subsequently have an impact on the quality of the "visible" video.

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Hi all,
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Please mark as helpful if you find my contribution useful or as an answer if it does answer your question. That will encourage me - and others - to take time out to help you. Thank you! Off2work

Ok this should be possible.
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I think you want the after effects forum?
peterlevin wrote:
> For some reason, a perfect mask in After Effects
produces a thin gray border around the mask in flash when
converting to FLV. Has anyone had this problem? Tried everything.
>
> Thanks.

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Alpha channel video makes for a larger-than-target bitrate flv

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