How to get alpha channel from RGBA video ?

[pfarmer]

Mathieu Virbel wrote
> 
> (By the way, what is the difference between bpp and depth ?)
> 

bpp:    "The number of bits allocated per pixel. This is usually 16, 24 or
32."
depth: "The number of bits used per pixel by the R/G/B components. This is
usually 15, 16 or 24."

[
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/pwg/html/section-types-definitions.html
]

I posted this just because I was searching this on google and came to this
post. 

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