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Your videos will need to have a square pixel aspect ratio to display properly. Use one of the following resolutions for recording HD video:   720p: 1280 x 720  1080p: 1920 x 1080  1440p: 2560 x 1440  2160p: 3840 x 2160 Use the same frame rate your video was recorded in to encode and upload it. Common frame rates are 24, 25, 30, 48, 50, and 60 frames per second (fps). Video bitrate is the rate at which the video codec encodes the video playback. Your video should be optimized for your video resolution, framerate, and whether or not your video has high dynamic range (HDR). YouTube recommends the following bitrates for standard framerates (24 - 30 fps) and high framerates (48 - 60 fps):    2160p: Standard framerate: 35-45 Mbps, High framerate: 53 -68 Mpbs.  2160p (HDR): Standard framerate: 44 - 56 Mbps, High framerate: 66 - 85 Mbps.  1440p: Standard framerate:: 16 Mbps, High framerate: 24 Mbps.  1440p (HDR): Standard framerate: 20 Mbps, High framerate: 30 Mbps.  1080p: Standard frame rate: 8 Mbps, High frame rate: 12 Mbps.  1080p (HDR): Standard framerate: 10 Mbps, High framerate: 15 Mbps.  720p: Standard frame rate: 5 Mbps, High framerate: 7.5 Mbps.  720p (HDR): Standard framerate: 6.5 Mbps, High framerate:: 9.5 Mbps. This is the recommended audio format for YouTube videos. YouTube also supports mono, stereo, and 5.1 surround sound channels. H.264 is the most common compression format for HD video. YouTube recommends videos be uploaded in MP4 format. However, almost all popular formats are supported by YouTube, including AVI, MOV, WMV, and FLV.

Summary:
Record the video in HD resolution. Use the correct frame rate. Select the proper video bitrate. Use the AAC-LC audio codec with a 48khz or 96khz sample rate. Use the H.264 video codec. Save the video in a supported format.