public String getGopBReference() {
        return this.gopBReference;
    }
Specify whether to allow B-frames to be referenced by other frame types. To use reference B-frames when your GOP
structure has 1 or more B-frames: Leave blank or keep the default value Enabled. We recommend that you choose
Enabled to help improve the video quality of your output relative to its bitrate. To not use reference B-frames:
Choose Disabled.

@return Specify whether to allow B-frames to be referenced by other frame types. To use reference B-frames when
        your GOP structure has 1 or more B-frames: Leave blank or keep the default value Enabled. We recommend
        that you choose Enabled to help improve the video quality of your output relative to its bitrate. To not
        use reference B-frames: Choose Disabled.
@see H264GopBReference
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/H264Settings.java