public Integer getSource608TrackNumber() {
        return this.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'.

@return 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