[FFmpeg-user] Alpha Channel QT with SubTitles

[Gandharv Bhagat]

hi Carl,

Any update on this will be useful. I am also curious why the font size is not absolute, at it seems to change the size depending on the png size. the size 18 font renders as different size if the PNG size is not full 1920x1080.

Cheers
Gandharv
________________________________
From: ffmpeg-user <ffmpeg-user-bounces at ffmpeg.org> on behalf of Gandharv Bhagat <fradac at hotmail.com>
Sent: Wednesday, January 17, 2018 11:34 AM
To: FFmpeg user questions
Subject: Re: [FFmpeg-user] Alpha Channel QT with SubTitles

Carl,

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 ?

Gandharv

> 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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