[FFmpeg-devel] Select the right format

[Michael Niedermayer]

On Tue, Nov 27, 2012 at 10:17:48PM +0000, Mark Himsley wrote:
> On 27/11/2012 00:21, Michael Niedermayer wrote:
> > On Sun, Nov 25, 2012 at 04:41:12PM +0000, Mark Himsley wrote:
> >> Suppose I wanted to add more 8 bit YUV formats to be accepted by the
> >> overlay filter.
> >>
> >> I don't see how I can do it right now.
> >>
> >> Because, for YUV, the MAIN and OVERLAY inputs have to match:
> >>  yuv420p (or yuva420p [1]) on the MAIN with yuva420p on the OVERLAY
> >>
> >> I want to add:
> >>  yuv422p (or yuva422p) on the MAIN with yuva422p on the OVERLAY
> >>  yuv444p (or yuva444p) on the MAIN with yuva444p on the OVERLAY
> >>
> >> The only way I can see to enable those is to pass a 'format' argument to
> >> the overlay filter.
> >>
> >> Can anyone think of a more elegant method, before I start coding a
> >> 'format' argument method?
> > 
> > MAIN == OUTPUT and supports all you want
> > OVERLAY supports all you want
> > 
> > if you get a OVERLAY type that cannot directly be used with what MAIN
> > is set to then insert / call scale to convert
> 
> Thanks for this alternate idea. Is there an example of inserting a scale
> filter from another?

there are mutiple examples

vf_smartblur for example uses the scaler,
libavfilter/vf_removelogo.c does too
the filter core injects scale filters when needed

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Let us carefully observe those good qualities wherein our enemies excel us
and endeavor to excel them, by avoiding what is faulty, and imitating what
is excellent in them. -- Plutarch
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