I have noted that videos taken with a camera have very high bitrate e.g. 10000kbps for 720p/1080p videos. But YouTube Videos in these resolutions have comparatively less bitrates for the same resolutions e.g. 2000-3000 kbps but there is not a lack of clarity always. I have a Tech Com TV Tuner the minimum bitrate is 1000kbps for a 352x288 video yet the video appear pixelated.