question: returns the sampleduration of the track in seconds . concode_field_sep Buffer outputBuffer concode_elem_sep Codec codec concode_elem_sep Buffer inputBuffer concode_elem_sep ArrayList<VideoTrack> tracks concode_elem_sep String nameFormat concode_elem_sep Format videoFormat concode_elem_sep int count concode_elem_sep int width concode_elem_sep Format fileFormat concode_elem_sep File dir concode_elem_sep int height concode_field_sep boolean isVFRSupported concode_elem_sep Format getFileFormat concode_elem_sep boolean isEmpty concode_elem_sep void writeSamples concode_elem_sep int getTrackCount concode_elem_sep int addTrack concode_elem_sep int addVideoTrack concode_elem_sep void writeSample concode_elem_sep boolean isDataLimitReached concode_elem_sep Format getFormat concode_elem_sep void createCodec concode_elem_sep void write concode_elem_sep void write concode_elem_sep void close
target: Rational function ( int arg0 ) { VideoTrack loc0 = tracks . get ( arg0 ) ; return new Rational ( loc0 . count , 30 ) ; }