aspectRatio

To better control resolution and aspect ratio of output videos, we recommend that you use the values MaxWidth, MaxHeight, SizingPolicy, PaddingPolicy, and DisplayAspectRatio instead of Resolution and AspectRatio. The two groups of settings are mutually exclusive. Do not use them together.

The display aspect ratio of the video in the output file. Valid values include:

auto, 1:1, 4:3, 3:2, 16:9

If you specify auto, Elastic Transcoder tries to preserve the aspect ratio of the input file.

If you specify an aspect ratio for the output file that differs from aspect ratio of the input file, Elastic Transcoder adds pillarboxing (black bars on the sides) or letterboxing (black bars on the top and bottom) to maintain the aspect ratio of the active region of the video.