So, I'm new to all of this and may not ask the question like an expert would but here goes:
I'm currently using Sony Vegas 10 to edit my videos. A lot of my videos come as mkv h.264. I convert them to avi using alltoavi. Then I import them into Sony Vegas and start hacking away. When I have just one clip of the video on the timeline it runs smoothly...however, if I overlap another clip to do a fade in etc...it starts lagging horribly in my preview window.
I heard that Sony no likey h.264...is there something I can do to change this? Most of my videos come this way