How To Remove Black Bars on youtube videos
yt:quality=high: Defaults to a high quality stream (available based on the size of the viewer's player and the size of the browser window)
yt:crop=16:9: Zooms in on the 16:9 area, removes windowboxing
yt:stretch=16:9: Fixes anamorphic content by scaling to 16:9
yt:stretch=4:3: Fixes 720x480 content that is the wrong aspect ratio by scaling to 4:3
yt:quality=high playback in best quality!
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