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标题: PHP基于ffmpeg实现转换视频，截图及生成缩略图的方法 [打印本页]

作者: 网络通达 时间: 2018-2-14 05:23

         本文实例讲述了PHP基于ffmpeg实现转换视频，截图及生成缩略图的方法。分享给大家供大家参考，具体如下：
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 = 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) {
$this->src$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){
      $new($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,$this->dstimg);
   }
   //裁图宽度优先
   if($ratioresize_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) {
      $new($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,$this->dstimg);
   }
   if($ratioresize_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);
$this->dst$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 > 3;
$scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size &
0x03) : 0;
for($i = 0, $l = $height - 1; $i > 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 ConvertBMP2GD($filename, $tmp_name)) {
   $($tmp_name);
   unlink($tmp_name);
   return $img;
}
return false;
  }
}
附：完整实例代码点击此处本站下载。
更多关于PHP相关内容感兴趣的读者可查看本站专题：《PHP图形与图片操作技巧汇总》、《php面向对象程序设计入门教程》、《PHP数组(Array)操作技巧大全》、《php字符串(string)用法总结》及《PHP数学运算技巧总结》
希望本文所述对大家PHP程序设计有所帮助。


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