[FFmpeg-soc] [PATCH] updated! vf_overlay alpha patch and watermarking using PNG with alpha

[Michael Niedermayer]

On Mon, Dec 07, 2009 at 03:59:12PM +0100, Artur Bodera wrote:
> On Mon, Dec 7, 2009 at 2:08 PM, Michael Niedermayer <michaelni at gmx.at>wrote:
> 
> > The issue is just that with arbitrary graphs its not so
> > easy to negotiate the format in a way that is scaleable and doesnt break
> > down to O(2^n) time
> >
> 
> Just a friendly, novice, out-of-the-box suggestion from my side - how does
> DirectX / DirectShow handle that?

I dont know, but if someone knows, iam interrested in that as well


> Isn't it a common scenario or a common
> problem that has already been resolved years ago?

no, NP = P hasnt been proofen yet


> I remember playing with
> directshow filter graphs that were, in their complexity, way beyond what
> we're considering here.

The problem is not the graph complexity the problem is finding an optimal
solution with few format convertions. You can trivially solve any graph by
just inserting a format convertion filter between any 2 filters

What our limitation allows us is finding a solution without convertion
filters if such a solution exists no matter how complex the graph. And
the overlay filter is the first that would be a little more convenient
if that limitation didnt exist.

[...]

-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Rewriting code that is poorly written but fully understood is good.
Rewriting code that one doesnt understand is a sign that one is less smart
then the original author, trying to rewrite it will not make it better.
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