public Mpeg2Settings withSubgopLength(String subgopLength) {
        setSubgopLength(subgopLength);
        return this;
    }
Relates to the GOP structure. If you do not know what GOP is, use the default. FIXED: Set the number of B-frames
in each sub-GOP to the value in gopNumBFrames. DYNAMIC: Let MediaLive optimize the number of B-frames in each
sub-GOP, to improve visual quality.

@param subgopLength
       Relates to the GOP structure. If you do not know what GOP is, use the default. FIXED: Set the number of
       B-frames in each sub-GOP to the value in gopNumBFrames. DYNAMIC: Let MediaLive optimize the number of
       B-frames in each sub-GOP, to improve visual quality.
@return Returns a reference to this object so that method calls can be chained together.
@see Mpeg2SubGopLength
aws-java-sdk-medialive/src/main/java/com/amazonaws/services/medialive/model/Mpeg2Settings.java