[FFmpeg-devel] [PATCH] Fix for paletteuse to support transparency

Clément Bœsch u at pkh.me
Fri Oct 20 09:43:12 EEST 2017

On Fri, Oct 20, 2017 at 12:35:00AM +0200, Carl Eugen Hoyos wrote:
> 2017-10-20 0:00 GMT+02:00 Bjorn Roche <bjorn at giphy.com>:
> > The palettes generated by palettegen include one transparent color.
> > This patch enables paletteuse to identify the transparency in incoming
> > video and tag transparent pixels on outgoing video.
> >
> > This requires tracking the transparency index in the palette,
> > establishing an alpha threshold below which a pixel is considered
> > transparent and above which the pixel is considered opaque, and
> > additional changes to track the alpha value throught the conversion
> > process. If the format of a color variable has changed in this patch,
> > an effort was also made to change the variable name for clarity.
> >
> > This change is a partial fix for https://trac.ffmpeg.org/ticket/4443
> > However, animated GIFs are still output incorrectly due to a bug
> > in gif optimization which does not correctly handle transparency.
> If Clément doesn't comment, I will probably push this in a few days.

I need a little more time. I don't think I can do this today, but tomorrow
might be OK.

Sorry about the delay.

Clément B.
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