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I have produced an HEVC (H.265) elementary stream which contains alpha (produced from Apple VideoToolbox framework), from which I would like to extract the alpha channel for further processing.

I'd like to process the alpha in either one of these two ways:-

(a) A series of grayscale PNG/JPEG images, with the alpha channel of each frame

or

(b) A series of PNGs with alpha with the RGB and Alpha composited in a single, semi-transparent image

How can I achieve either of these with FFmpeg/GStreamer?

Jonathan Ellis
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