[FFmpeg-user] Alpha Channel QT with SubTitles

Carl Eugen Hoyos ceffmpeg at gmail.com
Wed Jan 17 13:33:25 EET 2018

2018-01-11 22:42 GMT+01:00 Gandharv Bhagat <fradac at hotmail.com>:

> I am trying to generate an alpha channel QT, with Apple animation
> codec, but the I get output has a white background.

How do you test the background?

The fact that there is a white background using media players
(which in many cases do not support transparency) does not
necessary mean no transparency was encoded.

> here is the command
> ffmpeg -r 23.976 -loop 1 -i Alpha_1920x1080.png

Should be "-r 24000/1001"

Carl Eugen

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