Limitations of Sofdec tools

When encoding any video file into a .usm file using tools such as Sofdec2EncWiz, there are limitations on the video's height or width for each codec.

Sofdec.Prime	H.264	VP9
multiples of 8	multiples of 4	multiples of 2

If these restrictions are encountered, the image size of the video will be expanded so that it does not violate the codec restrictions.

The expanded area will be displayed in black (=0x000000FF).

A workaround for extended areas due to limitations in the Sofdec tool is to use a material to hide the extended areas.

Use a material to hide the extended area

This is achieved by comparing the vertical or horizontal width before and after expansion.
These values can be obtained from the FManaVideoTrackInfo structure held by the UManaMovie class.

Material implementation

Use a Scalar Parameter (UTiling / VTiling) to set the texture's UV values externally. The parameters will be used as the UV values for the referenced texture.

External parameter settings

Gets video track information from a UManaMovie object.

Texture Dimensions = Extended video image size
Display Dimensions = Video display size

From this information, we calculate the percentage of the video image size that is taken up by the video display size. (= Display Dimensions / Texture Dimensions) Set the parameters in the UMaterialInstanceDynamic object created based on the material implemented in "Implementing the Material" above.

Results

If no action is taken, black will be seen at the edges of the drawing.

By taking action, you can display the video in its original appearance.

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