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

[Reimar Döffinger]

On Mon, Dec 07, 2009 at 09:33:42PM +0100, Michael Niedermayer wrote:
> 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

I don't really know for sure, but I think DirectShow does not have any scale/colourspace
conversion filters, at least not by default, and a lot of codecs implement internal
conversions due to this.
Which makes me suspect they haven't actually solved it.
And I guess a few things are done via filter priorities in DirectShow, with a good
chance of breaking if they are set wrong - at least in the Win98 times or so.