[FFmpeg-devel] dealing with tables in DV codec
Roman V. Shaposhnik
Thu Sep 11 04:59:47 CEST 2008
On Thu, 2008-09-11 at 01:56 +0200, Diego Biurrun wrote:
> On Wed, Sep 10, 2008 at 12:27:21PM -0700, Roman Shaposhnik wrote:
> > On Wed, 2008-09-10 at 15:51 +0200, Diego Biurrun wrote:
> > > On Tue, Sep 09, 2008 at 01:51:06PM -0700, Roman Shaposhnik wrote:
> > > >
> > > > Now, on SPARC I see a stable speed loss of about ~3% or so.
> > >
> > > While we're discussing performance: qdv still performs about 50% better
> > > than FFmpeg on certain samples, do you know the reason? An example is
> > >
> > > http://samples.mplayerhq.hu/V-codecs/DVSD/henrich-weirdqt.mov
> > Wow! That's news to me. Thanks for bringing this up. I'm not familiar
> > with qdv. What is it? How can I test with it?
> It's a binary codec for DV that MPlayer can use. It performs up to 50%
> better than FFmpeg on some samples. Not on all samples though, for a
> few FFmpeg is slightly faster, but most of the time qdv wins by a
> considerable and sometimes even huge margin. Just try all DV samples
> from the MPlayer collection.
Good info. Thanks. A couple of questions, though:
1. What other samples do you know of that exhibit this slowness?
2. How can I benchmark the qdv via MPlayer so that things
like I/O get factored out? Command line switched would be best...
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