[FFmpeg-user] How to add alpha channel to normal png image

[Paul B Mahol]

Dana 28. 6. 2015. 09:31 osoba "qw" <applemax82 at 163.com> napisala je:
>
> Hi,
>
>
> PNG format supports alpha channel, but some png images don't have alpha
channel. How to add alpha channel to those png images and set alpha value?
>
>

See colorkey filter documentation.

> Thanks!
>
>
> B.R.
>
>
> Andrew
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