[FFmpeg-devel] [PATCH 4/5] lavfi: drop the requirement that request_frame returns a frame.

Clément Bœsch u at pkh.me
Mon Sep 21 08:30:12 CEST 2015

On Mon, Sep 21, 2015 at 12:32:22AM +0200, Michael Niedermayer wrote:
> On Sun, Sep 20, 2015 at 07:39:11PM +0200, Nicolas George wrote:
> > Le jour de la Raison, an CCXXIII, Paul B Mahol a écrit :
> > > For complex cases one needs to set for which set of input pixel
> > > formats output pixel format will be picked from another set, so its
> > > M->N mapping, without overlaping.
> > 
> > Yes, but what algorithm do you apply to the mapping afterwards to select the
> > best combination of formats? And for channel layouts, how do you express the
> > mapping over a domain with billions of elements?
> is there a list of filters that would benefit from a more powerfull
> query_format ?

If there is such a list, I'd like to add lut3d: I was looking for a way to
do the current simple query_formats with the addition of a XYZ input which
would be mapped to one or two rgb64 output if selected.

I think overlay was the first to have a special logic in that spirit? I
don't remember any other so far, but git grep EAGAIN libavfilter might
give hints.


Clément B.
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