public void setGopSize(Double gopSize) {
        this.gopSize = gopSize;
    }
Use this setting only when you set GOP mode control to Specified, frames or Specified, seconds. Specify the GOP
length using a whole number of frames or a decimal value of seconds. MediaConvert will interpret this value as
frames or seconds depending on the value you choose for GOP mode control. If you want to allow MediaConvert to
automatically determine GOP size, leave GOP size blank and set GOP mode control to Auto. If your output group
specifies HLS, DASH, or CMAF, leave GOP size blank and set GOP mode control to Auto in each output in your output
group.

@param gopSize
       Use this setting only when you set GOP mode control to Specified, frames or Specified, seconds. Specify
       the GOP length using a whole number of frames or a decimal value of seconds. MediaConvert will interpret
       this value as frames or seconds depending on the value you choose for GOP mode control. If you want to
       allow MediaConvert to automatically determine GOP size, leave GOP size blank and set GOP mode control to
       Auto. If your output group specifies HLS, DASH, or CMAF, leave GOP size blank and set GOP mode control to
       Auto in each output in your output group.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/H264Settings.java