[FFmpeg-user] Alpha Channel QT with SubTitles

Gandharv Bhagat fradac at hotmail.com
Wed Jan 17 18:34:38 EET 2018


Thanks for the frame rate multiplier correction, will make the change.

As for the file, I am checking in FCP 7. When alpha type is set to ‘none/ignore’ I see a white background and white text and the drop shadow. When the alpha type is set to ‘straight’, ‘black’, or ‘white’ I don’t see anything.

Perhaps I need to give the subtitles a color ?


> On Jan 17, 2018, at 06:34, Carl Eugen Hoyos <ceffmpeg at gmail.com> wrote:
> 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
> Unrelated:
> Should be "-r 24000/1001"
> Carl Eugen
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