php 使用 ffmpeg 转换视频，截图，并生成缩略图

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 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 = new ImageResize();
  $thumbnail->resizeimage("1.jpg", 30,30, 0, "small1.jpg");


 class ImageResize {

     //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;

 function resizeimage($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);
     }

 function newimg() {

 //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
     function initi_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
     function dst_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;
     }

     function ConvertBMP2GD($src, $dest = false) {
         if(!($src_f = fopen($src, "rb"))) {
             return false;
         }
         if(!($dest_f = fopen($dest, "wb"))) {
             return false;
         }
         $header = unpack("vtype/Vsize/v2reserved/Voffset", fread($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"
             return false;
         }

         $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";
                 }
             }
             else if($bits == 8) {
                 $gd_scan_line = $scan_line;
             }
             else if($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, $width);
             }
             else if($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);
         return true;
     }

 function imagecreatefrombmp($filename) {
         $tmp_name = tempnam("/tmp", "GD");
         if($this->ConvertBMP2GD($filename, $tmp_name)) {
             $img = imagecreatefromgd($tmp_name);
             unlink($tmp_name);
             return $img;
         }
         return false;
     }

 }