Видео и аудио кодирование

Видео

Кодеки

H.264

	function transform_video_x264_aac_mp4($file_src,$file_dst,$width,$height,$vb,$ab,$tmp_dir="./")
	{
		if (!file_exists($file_src)) return false;
		$X264_SUBQ="1";
		$X264_FRAMEREF="1";
		$X264_KEYINT="125";
		$X264_THREADS="auto";
		$X264_ME="hex";
		$X264_BFRAMES="1";
		$session_id=time();
		$files_prefix = $tmp_dir."".$session_id;
		$mediainfo = $this->exec_program("mediainfo ".$file_src);
		preg_match("/General[\s\S]*?Format\s+\:\s+(.*)\s+/",$mediainfo,$m);
		$format = $m[1];
		$format_profile = "";
		if (preg_match("/General[\s\S]*?Format profile\s+\:\s+(.*)\s+/",$mediainfo,$m))
		{
			$format_profile = $m[1];
		}
		$format_info = "";
		if (preg_match("/General[\s\S]*?Format\/Info\s+\:\s+(.*)\s+/",$mediainfo,$m))
		{
			$format_info = $m[1];
		}
		preg_match("/Video[\s\S]*?Frame rate\s+\:\s+(.*?)\s+fps/",$mediainfo,$m);
		//echo $format."\n";
		$fps = $m[1];
		if ($format_info == "Apple")
		{
			// dump audio
			$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
			// encode video from src
			$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			// encode audio
			$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		if ($format_profile == "QuickTime")
		{
			// dump audio
			$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
			// encode video from src
			$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			// encode audio
			$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		if ($format == "MPEG-4")
		{
			$mpeg4tracks = $this->exec_program("MP4Box -info ".$file_src);
			$tracks = preg_split("/\n\n/",$mpeg4tracks);
			$videotrack = false;
			foreach($tracks as $track)
			{
				if (preg_match("/Track # (\d+)[\s\S]*?Visual Stream/",$track,$m))
				{
					$videotrack = $m[1];
				}
			}
			$audiotrack = false;
			foreach($tracks as $track)
			{
				if (preg_match("/Track # (\d+)[\s\S]*?Audio (Stream|Track)/",$track,$m))
				{
					$audiotrack = $m[1];
				}
			}
			if ($videotrack === false) return false;
			$this->exec_program("MP4Box -raw ".$videotrack." ".$file_src." -out ".$files_prefix."_videostream");
			if ($audiotrack !== false) $this->exec_program("MP4Box -raw ".$audiotrack." ".$file_src." -out ".$files_prefix."_audiostream");
			$this->exec_program("mencoder ".$files_prefix."_videostream -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			if ($audiotrack !== false) $this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			if ($audiotrack !== false) $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			else $this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		if ($format == "AVI")//Format Audio Video Interleave
		{
			// dump audio
			$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
			// encode video from src
			$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			// encode audio
			$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		if ($format == "Windows Media")//WMV
		{
			// dump audio
			$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
			// encode video from src
			$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			// encode audio
			$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		if ($format == "Flash Video")//FLV
		{
			// dump audio
			$this->exec_program("mplayer -quiet ".$file_src." -ao pcm:fast:file=".$files_prefix."_audiostream -vc dummy -vo null -channels 2");
			// encode video from src
			$this->exec_program("mencoder ".$file_src." -ovc x264 -x264encopts bitrate=".$vb.":subq=".$X264_SUBQ.":frameref=".$X264_FRAMEREF.":me=".$X264_ME.":bframes=".$X264_BFRAMES.":threads=".$X264_THREADS.":keyint=".$X264_KEYINT." -of rawvideo -vf scale=".$width.":".$height." -ofps ".$fps." -nosound -o ".$files_prefix."_videostream.x264");
			// encode audio
			$this->exec_program("ffmpeg -i ".$files_prefix."_audiostream -strict experimental -acodec aac -ab ".$ab." -ac 2 ".$files_prefix."_audiostream.aac");
			$this->exec_program("MP4Box -new -add ".$files_prefix."_videostream.x264 -fps ".$fps." -add ".$files_prefix."_audiostream.aac ".$file_dst."");
			$this->exec_program("rm -f ".$files_prefix."_*");
			return true;
		}
		return false;
	}

VP9

• https://trac.ffmpeg.org/wiki/Encode/VP9
• https://www.youtube.com/watch?v=K6JshvblIcM
• https://ru.wikipedia.org/wiki/VP9