Sorry for the very delayed response, Carl:
On Tue, Nov 21, 2017 at 6:55 PM, Carl Eugen Hoyos <ceffm...@gmail.com>
wrote:
> 2017-11-21 18:53 GMT+01:00 Bjorn Roche <bj...@giphy.com>:
> > Support for transparencies in animated gifs requires modifying both
> > libavcodec/gif.c and libavformat/gif.c because both the graphics
> > control extension (handled by libavformat/gif.c) and the raw frame data
> > (handled by libavcodec/gif.c) must be changed.
>
> Does remuxing animated gif with transparency work with your patch?
>
A command like this:
ffmpeg -i in.gif out.gif
seems to produce the same output as before: transparency replaces with
opacity. However a command like this:
ffmpeg -i in.gif -vf palettegen -y /tmp/pal.png && ffmpeg -i in.gif
-i /tmp/pal.png -lavfi paletteuse -y -f gif out.gif
produces an output that looks like the input (including transparency).
I believe this is a problem with the decoder, however, since
ffmpeg -i /Users/bjorn/Desktop/smoketrail.gif
/Users/bjorn/Desktop/smoketrail-out%d.png
produces opaque images as well.
--
Bjorn Roche
Sr. Video Pipeline Engineer
bj...@giphy.com
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