it use to work fine when i bought it. now mkv plays no video and only sound. I've ad to use Windows media player. Nvidia GTX

Okay I have a video of my sons birthday party its all 1080p. It was the whole day recorded and i would like to use splash to convert it to a smaller size so i can burn it to a DVD. So we can watch it as a movie some time down the road. I'm new to Splash and was wandering what the best settings to ex...