public String getGopSizeUnits() {
        return this.gopSizeUnits;
    }
Specify how the transcoder determines GOP size for this output. We recommend that you have the transcoder
automatically choose this value for you based on characteristics of your input video. To enable this automatic
behavior, choose Auto and and leave GOP size blank. By default, if you don't specify GOP mode control,
MediaConvert will use automatic behavior. If your output group specifies HLS, DASH, or CMAF, set GOP mode control
to Auto and leave GOP size blank in each output in your output group. To explicitly specify the GOP length, choose
Specified, frames or Specified, seconds and then provide the GOP length in the related setting GOP size.

@return Specify how the transcoder determines GOP size for this output. We recommend that you have the transcoder
        automatically choose this value for you based on characteristics of your input video. To enable this
        automatic behavior, choose Auto and and leave GOP size blank. By default, if you don't specify GOP mode
        control, MediaConvert will use automatic behavior. If your output group specifies HLS, DASH, or CMAF, set
        GOP mode control to Auto and leave GOP size blank in each output in your output group. To explicitly
        specify the GOP length, choose Specified, frames or Specified, seconds and then provide the GOP length in
        the related setting GOP size.
@see H264GopSizeUnits
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/H264Settings.java