Multithread encoding seems not working well on Android.

[GoogleCodeExporter]

What is the expected behavior? What do you see instead?
After enabling the multithreading in vpx libraray and setting the thread usage 
to be the cpu core number, I should see a big performance gain. But instead, I 
only see a very slight performance again. And the cpu still has 20% idle. 

What version are you using? On what operating system?
Android Jerry Bean. 

Can you reproduce using the vpxdec or vpxenc tools? What command line are
you using?
Did not try yet. 

Please provide any additional information below.
The video encoding time varies a lot between frames. Better to use most 
complicated video sequence to fully exercise the encoder.  

Original issue reported on code.google.com by hku...@google.com on 3 May 2013 at 6:14

[GoogleCodeExporter]

Original comment by johannkoenig@google.com on 3 May 2013 at 6:42

• Changed state: Assigned

[GoogleCodeExporter]

Still an issue?

Original comment by johannkoenig@google.com on 6 Nov 2014 at 1:28