Are there any interesting PhantomJS alternatives that support html5 video or flash?

All right. So we have this software platform in our company that we use to test our clients websites. It consists of around 30 VPS servers (controlled from a single machine) which spawn Phantoms, each VPS can run around 150 of these simultaneously. That setup can generate quite an amount of traffic, so everything is dandy, but there's one major issue. More and more often we get asked to also do video testing, and that is not supported by PhantomJS. We tried some other solutions, like headless browsers (firefox, chrome), but it is not as resource effective as PhantomJS. It comes down to that a single VPS can only run about 10 headless browsers before it runs out of CPU/MEM. This means that we would have to scale the platform 10-15 times bigger, which is beyond our budget.

Because our whole platform is quite old (almost two years now), and no one has ever tried to improve it, i thought i would ask some of the more up-to-date developers, can you suggest any alternatives to PhantomJS that would be similar in resource consumption but could also support video, and of course, scripting? Does anything like that exist? This advice would be greatly appreciated. Thanks a lot.