Video scaling behavior and aspect ratios
You can choose how AWS Elemental MediaConvert scales your input video image to the output resolution that you specify by using Scaling behavior.
The following tables show how Scaling behavior, Scaling padding, Height, and Width interact to change the output image.
Default (Fit with padding)
If you choose Default (Fit with padding) for your Scaling behavior, MediaConvert scales your video image to your output resolution. Then, if your input resolution has a different aspect ratio than your output resolution, MediaConvert pads your video image until it matches the dimensions of your output resolution.
For example, if your input file is 1280 pixels by 720 pixels
and you specify an output resolution that is 640 pixels by 480
pixels, MediaConvert reduces the image size to 640x360 and then pads the top and
bottom of the image so that the final video resolution is 640x480.
MediaConvert does not use cropping for the Default scaling
behavior.
Key
The following key graphic shows input and output image width, height, cropping, and padding. In this key graphic, input dimensions (on the top and left) are in blue and output dimensions (on the right and bottom) are in red.
The following table shows example image scaling behavior when your input and output resolutions differ. For details about to read the images, reference the previous key graphic.
|
Condition |
Input |
Output |
|---|---|---|
|
Input width less than output width Input height less than output height |
|
|
|
Input width less than output width Input height greater than output height |
|
|
|
Input width greater than output width Input height less than output height |
|
|
|
Input width greater than output width Input height greater than output height |
|
|
Stretch to output
If you choose Stretch to output for your Scaling behavior, MediaConvert stretches or shrinks your video image to your output resolution.
For example, if your input image is 200 pixels by 200 pixels
and you want an output resolution that is 300 pixels by 400
pixels, MediaConvert increases the size of your input image to 300 pixels by
400 pixels, distorting the proportions of your output image. MediaConvert does
not use padding or cropping for the Stretch to output scaling
behavior.
Important
If your input resolution has a different aspect ratio than your output resolution, your output image will be distorted when compared to your input image.
Key
The following key graphic shows input and output image width, height, cropping, and padding. In this key graphic, input dimensions (on the top and left) are in blue and output dimensions (on the right and bottom) are in red.
The following table shows example image scaling behavior when your input and output resolutions differ. For details about to read the images, reference the previous key graphic.
|
Condition |
Input |
Output |
|---|---|---|
|
Input width less than output width Input height less than output height |
|
|
|
Input width less than output width Input height greater than output height |
|
|
|
Input width greater than output width Input height less than output height |
|
|
|
Input width greater than output width Input height greater than output height |
|
|
Fit
If you choose Fit for your Scaling behavior, MediaConvert scales your input image until it fits inside the dimensions of your output resolution, without exceeding the dimensions of your output resolution.
For example, if your input file is 200 pixels by 200 pixels
and you want an output resolution that is 300 pixels by 400
pixels, MediaConvert increases the image to 300 pixels by 300 pixels.
MediaConvert does not add padding to your output when you choose
Fit.
Key
The following key graphic shows input and output image width, height, cropping, and padding. In this key graphic, input dimensions (on the top and left) are in blue and output dimensions (on the right and bottom) are in red.
The following table shows example image scaling behavior when your input and output resolutions differ. For details about to read the images, reference the previous key graphic.
|
Condition |
Input |
Output |
|---|---|---|
|
Input width less than output width Input height less than output height |
|
|
|
Input width less than output width Input height greater than output height |
|
|
|
Input width greater than output width Input height less than output height |
|
|
|
Input width greater than output width Input height greater than output height |
|
|
Fit without upscaling
If you choose Fit without upscaling for your Scaling behavior, MediaConvert decreases the size of your input image until it fits inside the dimensions of your output resolution, without going over any of the dimensions of your output resolution. If your input image is smaller than your output image, MediaConvert does not increase the size of your image.
For example, if your input image is 400 pixels by 400 pixels
and you want an output resolution that is 200 pixels by 300
pixels, MediaConvert shrinks your input image to 200 pixels by 200
pixels. MediaConvert does not add padding when you choose Fit without
upscaling.
Note
You cannot choose Fit without upscaling when you enable Automated ABR in Apple HLS, DASH, or CMAF output groups.
Key
The following key graphic shows input and output image width, height, cropping, and padding. In this key graphic, input dimensions (on the top and left) are in blue and output dimensions (on the right and bottom) are in red.
The following table shows example image scaling behavior when your input and output resolutions differ. For details about to read the images, reference the previous key graphic.
|
Condition |
Input |
Output |
|---|---|---|
|
Input width less than output width Input height less than output height |
|
|
|
Input width less than output width Input height greater than output height |
|
|
|
Input width greater than output width Input height less than output height |
|
|
|
Input width greater than output width Input height greater than output height |
|
|
Fill
If you choose Fill for your Scaling behavior, MediaConvert scales your input image until it fills the dimensions of your output resolution, and crops anything that exceeds the dimensions of your output resolution.
For example, if your input file is 200 pixels by 200 pixels
and you want an output resolution that is 300 pixels by 400
pixels, MediaConvert increases the size of your input image to 400 pixels by
400 pixels, crops off the top and bottom 50 pixels, and
returns a 300 pixel by 400 pixel file. MediaConvert does not add
padding to your output when you choose Fill.
Key
The following key graphic shows input and output image width, height, cropping, and padding. In this key graphic, input dimensions (on the top and left) are in blue and output dimensions (on the right and bottom) are in red.
The following table shows example image scaling behavior when your input and output resolutions differ. For details about to read the images, reference the previous key graphic.
|
Condition |
Input |
Output |
|---|---|---|
|
Input width less than output width Input height less than output height |
|
|
|
Input width less than output width Input height greater than output height |
|
|
|
Input width greater than output width Input height less than output height |
|
|
|
Input width greater than output width Input height greater than output height |
|
|
