People have suggested languages, but I think they (and you!) are missing out the most fundamental first step. What do you want to achieve! You need to make a hi

People have suggested languages, but I think they (and you!) are missing out the most fundamental first step. What do you want to achieve! You need to make a high level overview of what your site will do, and from that sketch out a rough mid-level idea of the technologies you will need in the implementation. Then ask which languages have libraries or built-ins which facilitate your design. And only then, pick amongst the languages which are still in the running. It's hard to learn a new language, but it's harder to write a library/binding for video frame decoding, if your favored language doesn't already have one.