multiple proxies

Please support multiple proxies and the testing of those proxies within the interface. There's a number of programs that do this, namely SEO programs like scrapebox, all of GSA products, etc. They are able to run hundreds of threads through proxies. If you allow this then people can try and use public proxies or more importantly, purchased proxies which will be cleaner and safer. I've so far experienced that if I use more than 1 thread with your program, it gets blocked and half the videos cannot be downloaded. I think this is a measure that's coming from YouTube but I haven't tested everything fully yet.