question: gets the tracks trackid according to its occurence in the com.coremedia.iso.boxes.moviebox . concode_field_sep MediaDataBox<? extends TrackMetaDataContainer> mediaDataBox concode_elem_sep long trackId concode_elem_sep TrackMetaData<T> trackMetaData concode_elem_sep List<Chunk<T>> chunks concode_field_sep MediaDataBox<? extends TrackMetaDataContainer> getMediaDataBox concode_elem_sep long getSize concode_elem_sep TrackMetaData<T> getTrackMetaData concode_elem_sep void addChunk concode_elem_sep String toString concode_elem_sep List<Chunk<T>> getChunks concode_elem_sep int compareTo
target: long function ( ) { return trackId ; }