extracting alpha channel with ffmpeg for picture transparent info may be achieved as below. the transparency is useful for further SDI signal mux via video switcher.
$ ffmpeg -i input.mov -vf alphaextract,format=yuv420p output.mov
REF: https://ffmpeg.org/ffmpeg-filters.html#alphaextract
http://superuser.com/questions/1092015/want-to-extract-out-only-alpha-using-ffmpeg
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