[FFmpeg-devel] FFv1.3: full GOP 1/300, 2-pass statistics for Derf's collection

Michael Niedermayer michaelni at gmx.at
Wed Dec 5 20:19:56 CET 2012

On Wed, Dec 05, 2012 at 10:01:13AM +0100, Peter B. wrote:
> On 12/05/2012 06:12 AM, Loren Merritt wrote:
> > On Wed, 5 Dec 2012, Peter B. wrote:
> >
> >> It's very interesting to see that 2-pass with GOP=1 reaches almost the
> >> same compression ratio as single-pass with GOP=300. In some cases, it's
> >> even small than GOP=300 (marked red).
> > Of course. Each of your test videos is a single scene. The probability
> > tables don't need to change much from one frame to the next, because the
> > content doesn't change much.
> >
> > The same result *might* also hold for a whole movie, but your experiment
> > doesn't predict that one way or the other.
> >
> Well, I totally agree.
> I wanted to use different, longer material from our archive collection,
> but Michael suggested to use Derf's collection - and added:
> "I really dont understand what is so hard on simply downloading 10 files
> from a page and not messing with them before encoding. no other tools,
> no capture, no A/D nothing."
> So, I understood this as "use these official test videos".

Yes, i was trying to reduce the time the testing takes from months
to days or hours

also i wanted to have tests done with the same videos so theres some
comparability with the previous tests

and btw, thanks for running all the tests

Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Complexity theory is the science of finding the exact solution to an
approximation. Benchmarking OTOH is finding an approximation of the exact
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://ffmpeg.org/pipermail/ffmpeg-devel/attachments/20121205/dac83182/attachment.asc>

More information about the ffmpeg-devel mailing list