Why are videos that I upload to youtube blurry?

When ever I upload to youtube my video is extremely blurry. If you change to 1080 it looks fine but at 480 and 360 it is unwatchable. Other people's videos look fine at 480 and even 360 somethimes. My videos at 480 look like other people's videos at 144. What's going on here? I'm uploading 1080... show more When ever I upload to youtube my video is extremely blurry. If you change to 1080 it looks fine but at 480 and 360 it is unwatchable. Other people's videos look fine at 480 and even 360 somethimes. My videos at 480 look like other people's videos at 144. What's going on here? I'm uploading 1080 videos. I'm also using h.264.
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