[FFmpeg-devel] [RFC] H.264/SQV3 separation: h264data.h
Sun Dec 14 18:08:06 CET 2008
On Sun, Dec 14, 2008 at 05:09:47PM +0100, Diego Biurrun wrote:
> On Sun, Dec 14, 2008 at 05:03:04PM +0100, Michael Niedermayer wrote:
> > On Sun, Dec 14, 2008 at 04:24:43PM +0100, Diego Biurrun wrote:
> > > On Mon, Dec 01, 2008 at 02:02:57PM +0100, Michael Niedermayer wrote:
> > > >
> > > > maybe
> > > > -i your_file -y -an -f null /dev/null
> > >
> > > OK, I redid the benchmarks directly with ffmpeg on my K6-III, here are
> > > the results of 5 runs each, highest and lowest result discarded, all
> > > services stopped:
> > [...]
> > > ffmpeg-split -i cathedral-beta2-400extra-crop-avc.mp4 -an -f null -y -benchmark -v -1 /dev/null
> > > bench: utime=284.858s
> > > bench: utime=284.110s
> > > bench: utime=283.610s
> > >
> > > ffmpeg-vanilla -i cathedral-beta2-400extra-crop-avc.mp4 -an -f null -y -benchmark -v -1 /dev/null
> > > bench: utime=283.438s
> > > bench: utime=282.830s
> > > bench: utime=283.170s
> > >
> > >
> > > The result seems to be no slowdown or a very minor slowdown below 1%.
> > >
> > > So can I commit the next part of the split and continue working on it?
> > no, the apparent slowdown of cathedral-beta2-400extra-crop-avc.mp4 is not ok
> What is your suggestion?
I guess we would have to find out why its slower, once that is known we may
be able to do something to avoid it.
Finding this out though could be hard ...
some things to try are
listing the functions& sizes in the object file before and after the change
there could be changes to what is inlined for example ...
comparing profiler output, maybe this gives some hint
spliting the patch down to see if the problematic part can be isolated
Michael GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB
Many things microsoft did are stupid, but not doing something just because
microsoft did it is even more stupid. If everything ms did were stupid they
would be bankrupt already.
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