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LeeWilson · 1st May 2008, 04:30

Hi,

I am currently trying to implement AVI support into a OpenGL game engine. I have successfully got the engine to decompress AVI frames and render them in RGB. For various reasons I really need to get the alpha channel. I cannot seem to get a reliable AVI file, with alpha and Lagarith compression. I tried VirtualDub-1.7.8 and it seems that it does not support alpha channels in its conversions. I tried the Color Depth option for 32 bit RGB (888) (dummy alpha channel) and it made my movie go all semi transparent with vertical black lines. I also tried creating an uncompressed .mov with alpha, and using the movtoavi from http://lags.leetcode.net/Codec_mac.html and the avi result was black and white gibberish.

Does anyone know a reliable way of creating Lagarith compressed AVI's with the alpha channel?

Cheers in advance,

Lee

1st May 2008, 04:30	#60 \| Link
LeeWilson Registered User Join Date: Apr 2008 Posts: 2	RGBA and Alpha Hi, I am currently trying to implement AVI support into a OpenGL game engine. I have successfully got the engine to decompress AVI frames and render them in RGB. For various reasons I really need to get the alpha channel. I cannot seem to get a reliable AVI file, with alpha and Lagarith compression. I tried VirtualDub-1.7.8 and it seems that it does not support alpha channels in its conversions. I tried the Color Depth option for 32 bit RGB (888) (dummy alpha channel) and it made my movie go all semi transparent with vertical black lines. I also tried creating an uncompressed .mov with alpha, and using the movtoavi from http://lags.leetcode.net/Codec_mac.html and the avi result was black and white gibberish. Does anyone know a reliable way of creating Lagarith compressed AVI's with the alpha channel? Cheers in advance, Lee