Messages in this thread | | | Date | Tue, 2 Feb 2016 18:56:33 +0100 (CET) | From | Thomas Voegtle <> | Subject | RE: Performance drop on Baytrail with 4.5-rc2 |
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On Tue, 2 Feb 2016, Longepe, Philippe wrote:
> Hi Thomas, > > Yes, this new algorithm is intented to improve the performance versus power efficiency. > > Can you please provide us the exact instructions to reproduce your test ?
Hi,
my benchmark which I used is a little bit weird, so I tried to strip it down a little.
The sample I used: https://32h.de/tv/test.vdr
I downloaded a static built version from http://johnvansickle.com/ffmpeg/
I used the 64bit v2.8.6 binary. (md5 of ffmpeg binary: 2989d50b4b13cb1e549955522fd7d311)
And then I did: time -p ./ffmpeg -v 0 -y -i test.vdr -preset veryfast -vf scale=320:208 -strict -2 -f mp4 /dev/null
Very interesting: you only get a difference between 4.5-rc2-with-revert and 4.5-rc2 with the downscaling. When you remove "-vf scale=320:208", you get the same times on 4.5-rc2-with-revert and the unmodified 4.5-rc2. See below:
with downscale ============== 4.5-rc2-with-revert real 93.16 real 92.96 real 93.24
4.5-rc2 real 100.00 real 99.31 real 99.12
without "-vf scale=320:208" =========================== 4.5-rc2-with-revert real 157.59 real 157.27 real 157.58
4.5-rc2 real 157.49 real 157.68 real 157.53
I'm confused, but I hope this helps? Do you need anything else?
Thanks in advance.
Thomas
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