public void setSource608TrackNumber(Integer source608TrackNumber) {
        this.source608TrackNumber = source608TrackNumber;
    }
Specifies the video track index used for extracting captions. The system only supports one input video track, so
this should always be set to '1'.

@param source608TrackNumber
       Specifies the video track index used for extracting captions. The system only supports one input video
       track, so this should always be set to '1'.
aws-java-sdk-mediaconvert/src/main/java/com/amazonaws/services/mediaconvert/model/EmbeddedSourceSettings.java