Where you go wrong here is that a webcam image is pretty stable. Same background, person moving a little. Sure it can't be as optimal as a non real-time compr

Where you go wrong here is that a webcam image is pretty stable. Same background, person moving a little. Sure it can't be as optimal as a non real-time compressor can, and should therefore need more bandwidth, but high compression ratios on such an image aren't difficult. It's not valid to compare professional film work or even output BluRay encodes to what's required for your typical home video call.