什么是FFmpeg？

FFmpeg是一个开源免费跨平台的视频和音频流方案，属于自由软件，采用LGPL或GPL许可证（依据你选择的组件）。它提供了录制、转换以及流化音视频的完整解决方案。它包含了非常先进的音频/视频编解码库libavcodec，为了保证高可移植性和编解码质量，libavcodec里很多codec都是从头开发的。

FFmpeg在Linux平台下开发，但它同样也可以在其它操作系统环境中编译运行，包括Windows、Mac OS X等。

这个项目最早由Fabrice Bellard发起，现在由Michael Niedermayer维护。许多FFmpeg的开发人员都来自MPlayer项目，而且当前FFmpeg也是放在MPlayer项目组的服务器上。项目的名称来自MPEG视频编码标准，前面的"FF“代表"Fast Forward“。

/* 转视频   */$cmd="ffmpeg.exe -i tiwer_update_move.avi -ab 56 -ar 22050 -b 500 -r 15 -s 500x600 201112120089123.flv";

/*  视频截图*/$cmd="ffmpeg.exe -itiwer_update_move.avi -f image2 -ss 10 -s 600*500 -vframes 1 201112120089123.jpg";exec($cmd);

生成缩略图

/* 生成缩略图 */$thumbnail = new ImageHelper();  $thumbnail->resizeimage("2012121208123.jpg", 30,30, 0, "2012121208123_small.jpg");

图片处理工具类如下：

ImageHelper.class.php/** * 图片处理工具 * * Project: BoBo Manage System * This is NOT a freeware, use is subject to license terms! *  * Site: http://www.bobo123.cn * * $Id: ImageHelper.class.php 269 2011-03-08 00:44:01Z wgw8299 $ * * Copyright © 2007-2012 Bobo123.CN Developer Team. All Rights Reserved. */class ImageHelper {      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 = $dstpath;      }                   function ConvertBMP2GD($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);          }                  $gd_header .= "\xFF\xFF\xFF\xFF";            fwrite($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;      }            }

软件下载

　　FFmpeg官方下载：

视屏添加水印：

ffmpeg -iWildlife.wmv-vf "movie=panda.png[watermark];[in][watermark] overlay=10:10[out]"Marked.wmv

 

• 原始视频文件路径：Wildlife.wmv
• 水印图片路径：panda.png
• 水印位置：（x,y)=(10,10)<=(left,top)距离左侧、顶部各10像素；
• 输出文件路径：Marked.wmv

ImageHelper.class.php/** * 图片处理工具 * * Project: BoBo Manage System * This is NOT a freeware, use is subject to license terms! *  * Site: http://www.bobo123.cn * * $Id: ImageHelper.class.php 269 2011-03-08 00:44:01Z wgw8299 $ * * Copyright © 2007-2012 Bobo123.CN Developer Team. All Rights Reserved. */class ImageHelper {  

    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 = $dstpath;      }                   function ConvertBMP2GD($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);          }                  $gd_header .= "\xFF\xFF\xFF\xFF";            fwrite($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;      }            }