Adobe Media Encoder CC - Manual (Page 50)

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Encoding and exporting
Last updated 12/15/2014
Scale To Fit Scales the source frame to fit within the output frame while maintaining pixel aspect ratio of the source.
Source frames are letter-boxed or pillar-boxed within the output frame as necessary.
If you have cropped the video, the dimensions of the cropped video are adjusted to fit within the Frame Width and
Frame Height specified in the Video tab. If the aspect ratio defined by those values do not match that of the cropped
video, then you will necessarily have black bars on encoded footage.
Scale To Fill Scales the source frame to completely fill the output frame while cropping the source frame as necessary.
Pixel aspect ratio of the source frame is maintained.
Stretch To Fill Resizes the source frame to completely fill the output frame. Pixel aspect ratio of the source is not
maintained, hence distortions may occur if the output frame does not have the same aspect as the source.
Scale To Fit With Black Borders Source frame, including the cropped area, is fit within the output frame. Pixel aspect
ratio is maintained. A black border is applied to the video, even if the target dimension is smaller than the source video.
Change Output Size To Match Source Automatically sets the height and width of the output to the height and width of
the cropped frame, overriding the output frame size settings.
Select this setting if you want to export content for use with web applications without black borders such as those used
with letterboxing or pillarboxing.