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PHP基于ffmpeg实现转换视频,截图及生成缩略图的办法

发布时间:2022-02-24 11:51:40 所属栏目:PHP教程 来源:互联网
导读:这里把ffmpeg 和 生成缩略图整合了一下: include(ImageResize.class.php) //转视频 $cmd=ffmpeg.exe -i starwar.avi -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 1.flv; exec($cmd); //视频截图 $cmd=ffmpeg.exe -i starwar.avi -f image2 -ss 10 -s 400*3
  这里把ffmpeg 和  生成缩略图整合了一下:
 
  include("ImageResize.class.php")
   //转视频
   $cmd="ffmpeg.exe -i starwar.avi -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 1.flv";
   exec($cmd);
   //视频截图
   $cmd="ffmpeg.exe -i starwar.avi -f image2 -ss 10 -s 400*300 -vframes 1 1.jpg";
   exec($cmd);
   //生成缩略图
   $thumbnail=newImageResize();
   $thumbnail->resizeimage("1.jpg", 30,30, 0,"small1.jpg");
  classImageResize {
    //图片类型
    var$type;
    //实际宽度
    var$width;
    //实际高度
    var$height;
    //改变后的宽度
    var$resize_width;
    //改变后的高度
    var$resize_height;
    //是否裁图
    var$cut;
    //源图象
    var$srcimg;
    //目标图象地址
    var$dstimg;
    //临时创建的图象
    var$im;
  functionresizeimage($img,$wid,$hei,$c,$dstpath) {
      $this->srcimg =$img;
      $this->resize_width =$wid;
      $this->resize_height =$hei;
      $this->cut =$c;
      //图片的类型
      $this->type =strtolower(substr(strrchr($this->srcimg,"."),1));
      //初始化图象
      $this->initi_img();
      //目标图象地址
      $this-> dst_img($dstpath);
      //--
      $this->width = imagesx($this->im);
      $this->height = imagesy($this->im);
      //生成图象
      $this->newimg();
      ImageDestroy ($this->im);
    }
  functionnewimg() {
  //改变后的图象的比例
      $resize_ratio= ($this->resize_width)/($this->resize_height);
  //实际图象的比例
      $ratio= ($this->width)/($this->height);
  if(($this->cut)=="1") {
        //裁图 高度优先
        if($ratio>=$resize_ratio){
          $newimg= imagecreatetruecolor($this->resize_width,$this->resize_height);
          imagecopyresampled($newimg,$this->im, 0, 0, 0, 0,$this->resize_width,$this->resize_height, (($this->height)*$resize_ratio),$this->height);
          ImageJpeg ($newimg,$this->dstimg);
        }
        //裁图 宽度优先
        if($ratio<$resize_ratio) {
          $newimg= imagecreatetruecolor($this->resize_width,$this->resize_height);
          imagecopyresampled($newimg,$this->im, 0, 0, 0, 0,$this->resize_width,$this->resize_height,$this->width, (($this->width)/$resize_ratio));
          ImageJpeg ($newimg,$this->dstimg);
        }
      }else{
        //不裁图
        if($ratio>=$resize_ratio) {
          $newimg= imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
          imagecopyresampled($newimg,$this->im, 0, 0, 0, 0,$this->resize_width, ($this->resize_width)/$ratio,$this->width,$this->height);
          ImageJpeg ($newimg,$this->dstimg);
        }
        if($ratio<$resize_ratio) {
          $newimg= imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
          imagecopyresampled($newimg,$this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio,$this->resize_height,$this->width,$this->height);
          ImageJpeg ($newimg,$this->dstimg);
        }
      }
    }
  //初始化图象
    functioniniti_img() {
      if($this->type=="jpg") {
        $this->im = imagecreatefromjpeg($this->srcimg);
      }
      if($this->type=="gif") {
        $this->im = imagecreatefromgif($this->srcimg);
      }
      if($this->type=="png") {
        $this->im = imagecreatefrompng($this->srcimg);
      }
      if($this->type=="bmp") {
        $this->im =$this->imagecreatefrombmp($this->srcimg);
      }
    }
  //图象目标地址
    functiondst_img($dstpath) {
      $full_length=strlen($this->srcimg);
      $type_length=strlen($this->type);
      $name_length=$full_length-$type_length;
      $name=substr($this->srcimg,0,$name_length-1);
      $this->dstimg =$dstpath;
      //echo $this->dstimg;
    }
    functionConvertBMP2GD($src,$dest= false) {
      if(!($src_f=fopen($src,"rb"))) {
        returnfalse;
      }
      if(!($dest_f=fopen($dest,"wb"))) {
        returnfalse;
      }
      $header= unpack("vtype/Vsize/v2reserved/Voffset",fread($src_f,14));
      $info= unpack("Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant",fread($src_f, 40));
      extract($info);
      extract($header);
      if($type!= 0x4D42) {// signature "BM"
        returnfalse;
      }
      $palette_size=$offset- 54;
      $ncolor=$palette_size/ 4;
      $gd_header="";
      // true-color vs. palette
      $gd_header.= ($palette_size== 0) ?"/xFF/xFE":"/xFF/xFF";
      $gd_header.= pack("n2",$width,$height);
      $gd_header.= ($palette_size== 0) ?"/x01":"/x00";
      if($palette_size) {
        $gd_header.= pack("n",$ncolor);
      }
      // no transparency
      $gd_header.="/xFF/xFF/xFF/xFF";
  fwrite($dest_f,$gd_header);
  if($palette_size) {
        $palette=fread($src_f,$palette_size);
        $gd_palette="";
        $j= 0;
        while($j<$palette_size) {
          $b=$palette{$j++};
          $g=$palette{$j++};
          $r=$palette{$j++};
          $a=$palette{$j++};
          $gd_palette.="$r$g$b$a";
        }
        $gd_palette.=str_repeat("/x00/x00/x00/x00", 256 -$ncolor);
        fwrite($dest_f,$gd_palette);
      }
  $scan_line_size= (($bits*$width) + 7) >> 3;
      $scan_line_align= ($scan_line_size& 0x03) ? 4 - ($scan_line_size&
      0x03) : 0;
  for($i= 0,$l=$height- 1;$i<$height;$i++,$l--) {
        // BMP stores scan lines starting from bottom
        fseek($src_f,$offset+ (($scan_line_size+$scan_line_align) *$l));
        $scan_line=fread($src_f,$scan_line_size);
        if($bits== 24) {
          $gd_scan_line="";
          $j= 0;
          while($j<$scan_line_size) {
            $b=$scan_line{$j++};
            $g=$scan_line{$j++};
            $r=$scan_line{$j++};
            $gd_scan_line.="/x00$r$g$b";
          }
        }
        elseif($bits== 8) {
          $gd_scan_line=$scan_line;
        }
        elseif($bits== 4) {
          $gd_scan_line="";
          $j= 0;
          while($j<$scan_line_size) {
            $byte= ord($scan_line{$j++});
            $p1=chr($byte>> 4);
            $p2=chr($byte& 0x0F);
            $gd_scan_line.="$p1$p2";
          }
          $gd_scan_line=substr($gd_scan_line, 0,$width);
        }
        elseif($bits== 1) {
          $gd_scan_line="";
          $j= 0;
          while($j<$scan_line_size) {
            $byte= ord($scan_line{$j++});
            $p1=chr((int) (($byte& 0x80) != 0));
            $p2=chr((int) (($byte& 0x40) != 0));
            $p3=chr((int) (($byte& 0x20) != 0));
            $p4=chr((int) (($byte& 0x10) != 0));
            $p5=chr((int) (($byte& 0x08) != 0));
            $p6=chr((int) (($byte& 0x04) != 0));
            $p7=chr((int) (($byte& 0x02) != 0));
            $p8=chr((int) (($byte& 0x01) != 0));
            $gd_scan_line.="$p1$p2$p3$p4$p5$p6$p7$p8";
          }
          $gd_scan_line=substr($gd_scan_line, 0,$width);
        }
        fwrite($dest_f,$gd_scan_line);
      }
      fclose($src_f);
      fclose($dest_f);
      returntrue;
    }
  functionimagecreatefrombmp($filename) {
      $tmp_name= tempnam("/tmp","GD");
      if($this->ConvertBMP2GD($filename,$tmp_name)) {
        $img= imagecreatefromgd($tmp_name);
        unlink($tmp_name);
        return$img;
      }
      returnfalse;
    }
  } 

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