Video dimensions depend on the aspect ratio and resolution you're rendering the video at.

For 16:9 landscape videos, here are the dimensions for each resolution:

480p: 854x480
720p: 1280x720
1080p: 1920x1080

For 16:9 vertical videos, the dimensions are the same as for landscape but reversed.

480p: 480x854
720p: 720x1280
1080p: 1080x1920

For 1:1 square aspect ratio videos, here are the dimensions for each resolution:

480p: 480x480
720p: 720x720
1080p: 1080x1080

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