Video codecs perform best when the frame width and height use multiples of 16. While you can use any width and height in your encoding settings, non-optimal dimensions can result in poor image quality and reduced frame rate. For the best image quality and playback, you should always use width and height dimensions that use a multiple of 16 (best), 8 (better), or 4 (good). We would recommend that you refrain from using 4 or 8 multiples unless it is absolutely necessary. 

Note: Both the native encoding dimensions and the playback dimensions should be a multiple of 16. For example, if you encode your FLV file to use a frame dimension of 320 x 240, you should scale to a size such as 512 x 384. 

Refer to the following tables to pick dimensions for your layout.

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