Yamaha Video switching
The video section of your Yamaha is pretty high end and won't degrade the signal quality. If fact, with a component video input, you can take advantage of the upscalling feature to output 720p or 1080i to your HDTV over HDMI.
With HDMI input (and output) through the receiver you might run into an HDCP proplem with the satellite box and the receiver cannot upscale an HDMI input.