[fab67]

I come back once again about vp9 decoding with libvpx-vp9,
After some search I found how to enable 4 threads decoding. I patch ffmpeg libvpxdec.c like this :

- .threads = FFMIN(avctx->thread_count, 16)
+ .threads = 4

I don't know if it's the good way to patch but now libvpx-vp9 use 4 threads and it's fast enough to decode 720p vp9 file

Here is my openelec version with libvpx decoding (+ vp9 sample ) if someone want to try : https://drive.google.com/file/d/0B3hIUz8...sp=sharing