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

Clément Bœsch u at pkh.me
Sat Oct 21 23:00:04 EEST 2017

On Sat, Oct 21, 2017 at 09:47:47PM +0200, Carl Eugen Hoyos wrote:
> 2017-10-21 21:43 GMT+02:00 Clément Bœsch <u at pkh.me>:
> > On Sat, Oct 21, 2017 at 09:37:06PM +0200, Carl Eugen Hoyos wrote:
> >> 2017-10-21 18:40 GMT+02:00 Clément Bœsch <u at pkh.me>:
> >>
> >> > Aside from these nitpicks, I'm still concerned about how it's going
> >> > to conflict with GIF encoding where the transparent color is actually
> >> > used as a mean of not updating pixels from previous frames.
> >>
> >> But is this really related to this patch?
> >
> > Maybe not, but we need to keep that in mind and not make a
> > hasty decision wrt how we handle the transparency, because
> > it might makes future related development much harder.
> Given that this is a libavfilter-only patch and we can reproduce
> the issue without using libavfilter, I am not completely
> convinced, but this is of course your decision.

Yes it should be fine, I just want to be sure that using
palettegen/paletteuse will not create input streams that the limited GIF
encoder does not handle well because it doesn't make a difference between
"transparency flavours". If paletteuse starts inserting transparent colors
that are not meant to be used for the frame-diff system it could become a

In any case, I'll probably apply the patch at the next version, I'm just
not exactly comfortable with that part.

Clément B.
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