Gstreamer Alpha channel on black

[Andrew Silby]

Hi, I'm trying to produce a video stream which is transparent if the image
is black. I have a video feed which produces a black feed if there is no
input from a video capture device. I would like to overlay this onto another
video stream but not show the image if it is black. 

 

I thought I would be able to do this by using the alpha plugin on the black
video source specifying:

 

alpha method=custom target-r=0 target-g=0 target-b=0

 

but this doesn't work.

 

The closest I can get is: 

alpha method=custom target-r=0 target-b=0 target-g=0 black-sensitivity=128
white-sensitivity=0

 

This will make the black areas transparent but also anything slightly dark
transparent as well. I really just want the black areas to be transparent

 

Any help greatly appreciated.

 

Thanks,

Andy

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