public function getFrameRate()
    {
        if ($this->frameRate === null) {
            $match = [];
            preg_match(self::$REGEX_FRAME_RATE, $this->output, $match);
            $this->frameRate = (float)(array_key_exists(1, $match) ? $match[1] : 0.0);
        }

        return $this->frameRate;
    }
public function getFrameRate()
    {
        if ($this->frameRate === null) {
            $match = [];
            preg_match(self::$REGEX_FRAME_RATE, $this->output, $match);
            $this->frameRate = (float)(array_key_exists(1, $match) ? $match[1] : 0.0);
        }

        return $this->frameRate;
    }
public function getFrameRate ( ) { if ( $ this -> frameRate === null ) { $ match = [ ] ; preg_match ( self :: $ REGEX_FRAME_RATE , $ this -> output , $ match ) ; $ this -> frameRate = ( float ) ( array_key_exists ( 1 , $ match ) ? $ match [ 1 ] : 0.0 ) ; } return $ this -> frameRate ; }
Return the frame rate of a movie in fps.

@return float
Return the frame rate of a movie in fps .