The Evolution of YouTube 収益化
http://cristianggpp275.fotosdefrases.com/15-terms-everyone-in-the-youtube-zai-sheng-shi-jian-gou-ru-industry-should-know
Given that HDMI is really a electronic signal, it cannot be degraded much before the picture and audio will not be for a longer period decipherable. On analog signals, you may get quite a bit of degradation ahead