[FFmpeg-devel] dealing with tables in DV codec

Stefan de Konink skinkie
Thu Sep 11 02:02:54 CEST 2008

Hash: SHA1

Diego Biurrun schreef:
> 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.

Could it be they have implemented partial 'caching' of motionless
blocks? By looking at the difference between two frames? Or is such case
also handled in ffmpeg?

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