Twitch won't stream

With correct settings Twitch just won't steam from the mac client.

I didn't have any luck either (I got a few seconds here and there with bad contrast), but I just assumed it was either CPU, GPU, or bandwidth, since I'm not exceptionally endowed with any of them. Having some feedback on the bottleneck would be nice.

I think you'll agree that my spec is okay, and my bandwidth is decent too.