[MPlayer-dev-eng] video filter layer

Michael Niedermayer michaelni at gmx.at
Wed Apr 25 02:09:24 CEST 2007


On Tue, Apr 24, 2007 at 04:22:23PM -0400, Rich Felker wrote:
> On Sat, Apr 21, 2007 at 01:19:39PM +0200, Michael Niedermayer wrote:
> > Hi
> > 
> > On Sat, Apr 21, 2007 at 09:54:29AM +0200, Reimar Döffinger wrote:
> > [...]
> > > There are also things like having both MP_IMGFLAG_READABLE
> > > MP_IMGFLAG_PRESERVE, seems somewhat questionable to me whether one makes
> > > sense without the other...
> > 
> > IIRC the original idea was that a buffer could be in video memory (preserved
> > but slow as hell to read)
> > 
> > and conditional replenish based codecs just update some pixels but leave the
> > remainder unchanged, they also dont read from the buffer so they would
> > theoretically benefit from such buffers
> > 
> > but IMHO its an obscure feature which is pretty unimportant
> this actually offers a large performance boost to slow machines
> playing low quality 'divx' files, iirc..

how? I/P frames must be read and must be preserved so 

and b frames dont need to be preserved so i dont see how

maybe a decoder which needs to read the frame during decoding and the
memory isnt cached and ...
could ask for MP_IMGFLAG_READABLE=1 / MP_IMGFLAG_PRESERVE=0 for b frames
but this is getting fairly hypothetical, also i dont see what the problem
would be with just asking for MP_IMGFLAG_READABLE=1 / MP_IMGFLAG_PRESERVE=1
in that case ...

either way iam against making such obscure features a central
requirement of the new API, if we can easily support such things
and i guess we will good if not good too

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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