I want to upload a video to Youtube, but the video quality is horrible at 1080p and 720p. I render the video in 1440p, but the 720p version and 1080p version look chunky and blurry. When I watch the video in 1440p it looks perfect. I am also confused about the bitrate. I am using 70mbps bitrate, should that be fast enough? Also how do I fix the video quality issue?