PHP基于ffmpeg实现转换视频，截图及生成缩略图的方法

发布:smiling　来源: PHP粉丝网　添加日期：2018-08-31 10:27:37　浏览: 评论：0　

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;

  }

}