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CS3 – 20fps not poss for FLV export – alpha channel not exported in MS AVI uncomped
I want to export the final output of my project to FLV format including transparent alpha channel but at 20fps. FYI I have to create the flv at 20fps for large Flash project running at this rate (I know it’s mad, but that’s clients for you and, no, there is no option to re-encode their Flash project to 25fps)
The footage is of a person shot against a well lit green screen. I shot HD (1440 x x1080)on a Z1 to give a cleaner edge when chroma keying and then reduce resolution for final delivery as a 360 x 360 flv.
Filters used in Prem Pro CS3:I have added a crop to make approx 4:3 aspect, then Luma Curve to smooth green screen, then Color Key to remove green screen and finally Luma Corrector to correct luminance of person filmed against screen.
Media Encoder renders perfectly at 25fps, inc alpha channel, but does not render at 20fps. So instead I have to export in another format (MS AVI uncompressed?) and then use Sorenson Spark 4.5 to batch encode to 20fps FLV.
Unfortunately, I cannot seem to get the standard MS AVI to recognise the alpha channel and it renders the output video ignoring the color key altogether.
Export settings to uncompressed format are:
File Type: Microsoft AVI,
Video Compressor: None,
Frame size 720×576,
Frame rate: 25fps.So the questions are:
1) can I force Media Encoder to work at 20fps instead of 25?
2) Can I export to another intermediate format to include alpha channel data and if so, what?
I believe Sorenson Spark encodes Alpha Channel data OK using ON2 VP6 codec, which I have.
Any advice on what I can do, what codecs I may need, and how I can jam all this together would be much appreciated.
Thanks …..
Andrew Longhurst
The Art of MixIs it pixels or pixies that I’m having trouble with?
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1 Reply
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1. No
2. Yes…choose File>Export>Movie. Then choose Microsoft AVI, Compressor= None and Color Depth of Millions+ Colors. The + sign is for the alpha channel.
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