On 3/11/2018 6:01 PM, Gonzalo Garramuño wrote:

and I get a mov file but without an alpha channel.  ffprobe reports:

Stream #0:0(eng): Video: prores (ap4h / 0x68347061), yuva444p10le(progressive), 1280x720, 61876 kb/s, SAR 1:1 DAR 16:9, 25 fps, 25 tbr, 12800 tbn, 12800 tbc (default)

'yuva444p10le' -> the 'a' in 'yuva' represents alpha.

Check with

ffmpeg -i bunny.mov -lavfi color=s=hd720:c=pink[bg];[bg][0]overlay=shortest=1" test.mov

In test.mov, do you see pink in place of the transparent parts of bunny.mov?

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