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Common video dimensions and aspect ratios
When encoding video you may wish to keep to certain standard dimensions keeping in mind that dimensions, for computational reasons, should be divisible by 16 (sometimes by eight). This list can be used for reference.
Note: must match same aspect ratio as your source video
The video you output must match the same aspect ratio as your source video or else the encode may fail or may lead to stretching / compression in the output dimensions. To discover what aspect ratio your source already has, either match the dimensions to the ones on this list or input the dimensions in an aspect ratio calculator such as this one or this one.
Aspect ratio 3:2:
1440x9601296x864
1152x768
960x640
864x576
816x544
768x512
720x480 (DVD)
480x320
528x352
240x160
Aspect ratio 4:3
320x240 (standard web)448x336
480x360 * divisible by 8 may also work
640x480
768x576
1152x864
1280x960
Aspect ratio: 16:9
1024x5761280x720
768x432
640x360 * divisible by 8 may also work
512x288
256x144
Aspect ratio 2:1
1280x640960x480
720x360
576x288
512x256
480x240
320x160
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