pjsip: tweak x264 settings for better performance

Ignore-this: 3f46c0079284e9be453112215ad2e438

darcs-hash:20140827143518-56b4d-d3dc759109f32631e2d14211d1cbd98fd5272932
Add video support

Ignore-this: 8c9721de3ac9fd016c955c5530502625

darcs-hash:20140828111845-56b4d-a084157a6cbc6caccec6fa86b6105cbba57fd15f
Raised core revision

Ignore-this: d617f75e93a938e8f791c8f0084d980e

darcs-hash:20140828111924-56b4d-4ae9dff8f11c611e76de6037ffb1b60e512e8620