Luma -> Alpha with v1.18

amindfv at amindfv at
Wed Jan 5 22:19:08 UTC 2022

I'm looking for a way to use the luma plane of one video as the alpha plane of another.

It appears the "alphacombine" element ( can do this, but it's too new even for the unstable release of GStreamer, and for a variety of reasons I'm stuck on the latest stable (1.18).

What I'm trying to do is also possible in ffmpeg with "extractplanes=y" + "alphamerge".

I'd welcome any way to do this, no matter how much of a hack. Big pipeline? Fine. Somehow using GPU/shaders? No prob.


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