The most authoritative answer in 2024
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Stella Ross——Studied at University of California, Los Angeles (UCLA), Lives in Los Angeles, CA
Recommended audio bitrates for uploads.
YouTube uses 16:9
aspect ratio players. If you're uploading a non-16:9 file, it will be processed and displayed with either black bars on the left and right (pillar boxes) or black bars at the top and bottom (letter boxes) to make a 16:9
ratio in the player.
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