[MPlayer-dev-eng] [RFC] use libavcodec png encoder for vf_screenshot

[Reimar Döffinger]

Hello,
On Sun, Oct 07, 2007 at 11:20:20AM +0200, Reimar Döffinger wrote:
> On Sun, Oct 07, 2007 at 11:02:37AM +0200, Attila Kinali wrote:
> > On Sat, 6 Oct 2007 22:49:15 +0200
> > Reimar Döffinger <Reimar.Doeffinger at stud.uni-karlsruhe.de> wrote:
> > > advantage: less dependencies, a bit less code.
> > > disadvantage: lavc always uses Z_DEFAULT_COMPRESSION, so it is slower
> > > than current code (though the files are also smaller).
> > 
> > It's only vf_screenshot, so i guess that the little speed difference
> > is ok (it's only used occasionally anyways).
> 
> Well, there is a mode that will make it take a screenshot of every frame
> until toggled again. I submitted a patch to ffmpeg to make compression
> level configurable though.
> After that, it will produce the images in fastest mode too (though in
> fastest mode with ffmpeg they are not compressed at all, visible by them
> all being the same size - seems to be different with libpng).
> Only vf->priv->avctx->compression_level needs to be change to set a
> different level if someone wants to implement that.

Applied, a patch to make lavc png encoder use compression_level is in
the queue...

Greetings,
Reimar Döffinger