[FFmpeg-devel] [PATCH] lavfi: protection against premultiplied alpha (was: The patch series about premultiplied alpha)

[Niklas Haas]

On Sun, 03 Aug 2025 20:15:09 +0200 Nicolas George <george at nsup.org> wrote:
> Nicolas George (HE12025-08-03):
> > I will send the series here in a few hours.
>
> Here is a series of patch. I am absolutely not sure I found all the
> filters that could be flagged, but the rest can be done as the need
> arises.
>
> Not tested every filter, but it is pretty straightforward.
>
> I could not find how to download your patch series in a format suitable
> for git am from the monster, I used the v2 series, but it should not
> change anything.
>
> Regards,

Hi Nicolas,

I still think this series overall is a step in the wrong direction; and that
our goal should be to move towards negotiation, and not towards some IMO hacky
flag that is already deprecated on arrival.

However, I decided I would rather just implement the full negotiation at this
point, to save ourselves the continued discussion; especially in light of the
TC's inaction / radio silence.

Can you confirm that, if we implement full negotiation (thus allowing every
filter to decide for itself which alpha modes it can ingest), your remaining