Video codecs such as On2 VP6 and Sorenson Spark perform better 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 4 (good), 8 (better), or 16 (best). Refer to the following tables to pick dimensions for your layout.
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 320×240, you should scale to a size such as 512×384.
Table 1 - 4:3 Aspect Ratio Sizes
Best (16)
Better (8)
Good (4)
640 x 480
608 x 456
624 x 468
576 x 432
544 x 408
592 x 444
512 x 384
480 x 360
560 x 420
448 x 336
416 x 312
528 x 396
384 x 288
352 x 264
496 x 372
320 x 240
288 x 216
464 x 348
256 x 192
224 x 168
432 x 324
192 x 144
160 x 120
400 x 300
128 x 96
368 x 276
336 x 252
304 x 228
272 x 204
240 x 180
208 x 156
176 x 132
144 x 108
112 x 84
Table 2 - 16:9 Aspect Ratio Sizes
Best (16)
Better (8)
Good (4)
1280 x 720
1152 x 648
1216 x 684
1024 x 576
896 x 504
1088 x 612
768 x 432
640 x 360
960 x 540
512 x 288
384 x 216
832 x 468
256 x 144
128 x 72
704 x 396
576 x 324
448 x 252
320 x 180
192 x 108
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