Video call quality

i would like to know why the video quality is medium i have 30mbs internet with 5 mbs of upload speed can anybody tell me why videocalls are medium quality 
thank you 

The problem is on the Sony side. I have Bravia as well and spent a lot of time pinpointing the issue.
Let's start with the fact, that although Sony advertises the camera as HD, TV set is only capable of 640x480 resolution. Period. Documented on Sony website. If you set Windows/Mac skype on the other side and run a debug console you will see that TV set is actually sending 640x480.
However, the quality is not even close to 640x480. If you substitute TV with Windows skype and mediocre webcam only capable of 640x480, you get much better picture.
The reason seems to be pretty trivial. If you look at the self view inside Sony menus and during the call, you will notice that they only show very small rectangle. Measuring it's height relative to TV 1080 resolution reveals that it's exactly 240 points...
Another hint, talk to Sony skype from Windows skype and reduce your window size to about 240p height - the picture would be crisp. Though small
What Sony seems to be doing is grabbing the picture from the camera at 320x240 and upscaling it to 640x480! Then compressing and sending. No technical reason as it's the same work for DSP to perform such a compression.
Looks like a bug, by some ignorant developer that instead of downscaling self view, upscaled transmitted feed.
I talked to Sony support. They have no clue.They promised to open a ticked to their R&D, but that was 5 months ago, numerous firmware updates since than and no response...
I regret that I didn't return my TV to Amazon by the time I could do that.

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