Hi, I have a bunch of .mts files, and I'd like to put several of them on Youtube. Is there a particular Youtube-supported format that I should convert them to that's better than the other formats? Are there particular Youtube-supported formats that would allow me to keep their HD quality? And finally, what software do you recommend I use to convert them? Currently, they're stored on a mac (I rue the day I ever bought that damn thing), but I could do the conversion work on my PC, if that matters for what software you recommend. Thanks very much!