CLASSE FFMPEG DE GESTION DE VIDÉOS

<?php
/*
 * @ name : video.php
 * @ description : a class used to encode, decode, resize and reformat videos...
 * @ author : Yaug - Manuel Esteban
 * @ contact : yaug@caramail.com
 * @ date : 03/01/2008
*/

class Video{

	public 	$video_file, $duration, $bitrate, $video_format, $audio_format,
			$video_size, $video_fps, $audio_freq, $audio_bitrate,
			$encoding_vformat, $encoding_aformat, $encoding_vcodec, $encoding_acodec,
			$encoding_vsize, $encoding_duration, $encoding_afreq, $encoding_target,
			$encoding_packet_size, $encoding_aspect, $encoding_ac, $encoding_bitrate,
			$encoding_abitrate, $encoding_fps, $encoding_time_position, $encoding_nosound;
	private $video_id;

	/*
	 * function : __construct
	 * @description : Constructor
	 * @param : $video
	*/
	public function __construct($video){
		$this->video_file 	= $video;
		$this->video_id		= md5($video);

		//On récupère les infos de la vidéo
		exec("ffmpeg  -i ".$this->video_file." &> ".$this->video_id.".info");
		$this->get_video_info();
	}

	/*
	 * function : __destruct
	 * @description : Destructor
	 * @param :
	*/
	public function __destruct(){
		if( is_file($this->video_id.".info") ) unlink($this->video_id.".info");
	}

	/*
	 * function : getextension
	 * @description : return the extension of any file
	 * @param : $file - name of the file (video.avi)
	*/
	public function getextension($file){
		return substr($file,strrpos($file,'.')+1);
	}


	/*
	 * function : get_video_info
	 * @description : Extract all the video information with ffmpeg
	*/
	private function get_video_info(){
		$handle = fopen($this->video_id.".info","r");
		if($handle){
		    while (!feof($handle)) {
		        $buffer = fgets($handle, 4096);
		        $Line=explode(" ",$buffer);
		        //print_r($Line);
		        //print("\n");
		        switch($Line[2]){
					case 'Duration:': 
						$this->duration = $Line[3];
						$this->bitrate 	= $Line[7];
					case 'Stream':
						if($Line[4]=="Video:"){
							$this->video_format = $Line[5];
							$this->video_size 	= $Line[7];
							$this->video_fps 	= $Line[8];
						}elseif($Line[4]=="Audio:"){
							$this->audio_format = $Line[5];
							$this->audio_freq 	= $Line[6];
							$this->audio_bitrate= $Line[9];
						}
				}
		    }
		    fclose($handle);
			return true;
		}
		return false;
	}


	/*
	 * function : set_encoding_vformat()
	 * @description : Set the format for video encoding
	 * @param : $format (the format of the output video)
	*/
	public function set_encoding_vformat($format){
		$this->encoding_vformat = $format;
	}


	/*
	 * function : set_encoding_aformat()
	 * @description : Set the format for audio encoding
	 * @param : $format (the format of the output audio)
	*/
	public function set_encoding_aformat($format){
		$this->encoding_aformat = $format;
	}


	/*
	 * function : set_encoding_vcodec()
	 * @description : Set the codec for video encoding, be carefull with the codec name
	 * @param : $codec (the codec of the output video)
	*/
	public function set_encoding_vcodec($codec){
		$this->encoding_vcodec = $codec;
	}


	/*
	 * function : set_encoding_acodec()
	 * @description : Set the codec for audio encoding, be carefull with the codec name
	 * @param : $codec (the codec of the output audio)
	*/
	public function set_encoding_acodec($codec){
		$this->encoding_acodec = $codec;
	}


	/*
	 * function : set_encoding_vsize()
	 * @description : Set the size of the output video
	 * @param : $width (width of the output video)
	 * @param : $height (height of the output video)
	*/
	public function set_encoding_vsize($size){
		$this->encoding_vsize = $size;
	}


	/*
	 * function : set_encoding_duration()
	 * @description : Set the size of the output video
	 * @param : $duration (duration of the output like 00:00:10)
	*/
	public function set_encoding_duration($duration){
		$this->encoding_duration = $duration;
	}


	/*
	 * function : set_encoding_afreq()
	 * @description : Set the audio frequence of the output video
	 * @param : $freq (audio frequence of the output like 00:00:10)
	*/
	public function set_encoding_afreq($freq){
		$this->encoding_afreq = $freq;
	}


	/*
	 * function : set_encoding_target()
	 * @description : Specify target file type
	 * @param : $target (Specified target file type)
	*/
	public function set_encoding_target($target){
		$this->encoding_target = $target;
	}


	/*
	 * function : set_encoding_packet_size()
	 * @description : Set packet size in bits.
	 * @param : $weight (Size)
	*/
	public function set_encoding_packet_size($weight){
		$this->encoding_packet_size = $weight;
	}


	/*
	 * function : set_encoding_aspect()
	 * @description : Set aspect ratio (4:3, 16:9 or 1.3333, 1.7777).
	 * @param : $ratio (Ratio of the generated video)
	*/
	public function set_encoding_aspect($ratio){
		$this->encoding_aspect = $ratio;
	}


	/*
	 * function : set_encoding_ac()
	 * @description : Set the number of audio channels
	 * @param : $nb (Number of channels)
	*/
	public function set_encoding_ac($nb){
		$this->encoding_ac = $nb;
	}


	/*
	 * function : set_encoding_bitrate()
	 * @description : Set the video bitrate in bit/s
	 * @param : $bitrate
	*/
	public function set_encoding_bitrate($bitrate){
		$this->encoding_bitrate = $bitrate;
	}


	/*
	 * function : set_encoding_abitrate()
	 * @description : Set the audio bitrate in bit/s
	 * @param : $abitrate
	*/
	public function set_encoding_abitrate($abitrate){
		$this->encoding_abitrate = $abitrate;
	}


	/*
	 * function : set_encoding_fps()
	 * @description : Set frame rate
	 * @param : $fps
	*/
	public function set_encoding_fps($fps){
		$this->encoding_fps = $fps;
	}


	/*
	 * function : set_encoding_time_position()
	 * @description : time position in seconds. hh:mm:ss[.xxx] syntax is also supported.
	 * @param : $position
	*/
	public function set_encoding_time_position($position){
		$this->encoding_time_position = $position;
	}


	/*
	 * function : set_encoding_nosound()
	 * @description : time position in seconds. hh:mm:ss[.xxx] syntax is also supported.
	 * @param : $position
	*/
	public function set_encoding_nosound(){
		if($this->encoding_nosound)$this->encoding_nosound=false;
		else $this->encoding_nosound=true;
	}


	/*
	 * function : encode()
	 * @description : Encode video with defined params
	 * @param : $file_name (name of the file created.)
	*/
	public function encode($file_name){
		$command = "ffmpeg -y -i ".$this->video_file;
		if($this->encoding_vformat) 	$command.=" -f ".$this->encoding_vformat;
		if($this->encoding_vcodec) 		$command.=" -vcodec ".$this->encoding_vcodec;
		if($this->encoding_acodec) 		$command.=" -acodec ".$this->encoding_acodec;
		if($this->encoding_vsize) 		$command.=" -s ".$this->encoding_vsize;
		if($this->encoding_duration)	$command.=" -t ".$this->encoding_duration;
		if($this->encoding_fps)			$command.=" -r ".$this->encoding_fps;
		if($this->encoding_bitrate)		$command.=" -b ".$this->encoding_bitrate;
		if($this->encoding_nosound)		$command.=" -an ";
		if($this->encoding_abitrate)	$command.=" -ab ".$this->encoding_abitrate;
		if($this->encoding_afreq)		$command.=" -ar ".$this->encoding_afreq;
		if($this->encoding_ac)			$command.=" -ac ".$this->encoding_ac;
		if($this->encoding_target)		$command.=" -target ".$this->encoding_target;
		if($this->encoding_packet_size)	$command.=" -ps ".$this->encoding_packet_size;
		if($this->encoding_aspect)		$command.=" -aspect ".$this->encoding_aspect;
		if($this->encoding_time_position)	$command.=" -ss ".$this->encoding_time_position;
		$command.=" $file_name";

		print("commande executée : $command");

		shell_exec($command);
	}


	/*
	 * function : get_image()
	 * @description : Get an image for a specific frame of a video
	 * @param : $frame (00:00:10.0002)
	 * @param : $image_name (name of this image)
	 * @param : $size
	*/
	public function get_image($frame,$image_name,$size){
		$this->encoding_vformat 		= "mjpeg";
		$this->encoding_duration 		= "001";
		$this->encoding_time_position 	= $frame;
		$this->encoding_vsize 			= $size;
		
		//We build the image
		$this->encode($image_name);
	}
}


?>