The camera already does realtime compression to the sdcard. It has dedicated hardware for this. USB-2 has adequate bandwidth for compressed audio+video. Your H

The camera already does realtime compression to the sdcard. It has dedicated hardware for this. USB-2 has adequate bandwidth for compressed audio+video. Your HDMI capture device (which is a cheap portable device with limited processing power) is probably going to do a much worse job. Sending uncompressed video over usb is absurd.