public String getInput() {
        return this.input;
    }
Specify the .mov file or series of .png files that you want to overlay on your video. For .png files, provide the
file name of the first file in the series. Make sure that the names of the .png files end with sequential numbers
that specify the order that they are played in. For example, overlay_000.png, overlay_001.png, overlay_002.png,
and so on. The sequence must start at zero, and each image file name must have the same number of digits. Pad your
initial file names with enough zeros to complete the sequence. For example, if the first image is overlay_0.png,
there can be only 10 images in the sequence, with the last image being overlay_9.png. But if the first image is
overlay_00.png, there can be 100 images in the sequence.

@return Specify the .mov file or series of .png files that you want to overlay on your video. For .png files,
        provide the file name of the first file in the series. Make sure that the names of the .png files end
        with sequential numbers that specify the order that they are played in. For example, overlay_000.png,
        overlay_001.png, overlay_002.png, and so on. The sequence must start at zero, and each image file name
        must have the same number of digits. Pad your initial file names with enough zeros to complete the
        sequence. For example, if the first image is overlay_0.png, there can be only 10 images in the sequence,
        with the last image being overlay_9.png. But if the first image is overlay_00.png, there can be 100
        images in the sequence.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/MotionImageInserter.java