php 使用 ffmpeg 转换视频，截图，并生成缩略图

http://blog.csdn.net/toss156/article/details/7003059
把ffmpeg 和  生成缩略图整合了一下。

1. include("ImageResize.class.php")  
2.  //转视频  
3.  $cmd="ffmpeg.exe -i starwar.avi -ab 56 -ar 22050 -b 500 -r 15 -s 320x240 1.flv";  
4.  exec($cmd);  
5.  //视频截图  
6.  $cmd="ffmpeg.exe -i starwar.avi -f image2 -ss 10 -s 400*300 -vframes 1 1.jpg";   
7.  exec($cmd);  
8.  //生成缩略图  
9.  $thumbnail = new ImageResize();  
10.  $thumbnail->resizeimage("1.jpg", 30,30, 0, "small1.jpg");  
11.   
12.   
13. class ImageResize {  
14.      
15.     //图片类型  
16.     var $type;  
17.      
18.     //实际宽度  
19.     var $width;  
20.      
21.     //实际高度  
22.     var $height;  
23.      
24.     //改变后的宽度  
25.     var $resize_width;  
26.      
27.     //改变后的高度  
28.     var $resize_height;  
29.      
30.     //是否裁图  
31.     var $cut;  
32.      
33.     //源图象  
34.     var $srcimg;  
35.      
36.     //目标图象地址  
37.     var $dstimg;  
38.      
39.     //临时创建的图象  
40.     var $im;  
41.   
42. function resizeimage($img, $wid, $hei,$c,$dstpath) {  
43.         $this->srcimg = $img;  
44.         $this->resize_width = $wid;  
45.         $this->resize_height = $hei;  
46.         $this->cut = $c;  
47.          
48.         //图片的类型  
49.         $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));  
50.          
51.         //初始化图象  
52.         $this->initi_img();  
53.          
54.         //目标图象地址  
55.         $this -> dst_img($dstpath);  
56.          
57.         //--  
58.         $this->width = imagesx($this->im);  
59.         $this->height = imagesy($this->im);  
60.          
61.         //生成图象  
62.         $this->newimg();  
63.          
64.         ImageDestroy ($this->im);  
65.     }  
66.   
67. function newimg() {  
68.   
69. //改变后的图象的比例  
70.         $resize_ratio = ($this->resize_width)/($this->resize_height);  
71.   
72. //实际图象的比例  
73.         $ratio = ($this->width)/($this->height);  
74.   
75. if(($this->cut)=="1") {  
76.             //裁图 高度优先  
77.             if($ratio>=$resize_ratio){  
78.                 $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
79.                 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);  
80.                 ImageJpeg ($newimg,$this->dstimg);  
81.             }  
82.              
83.             //裁图 宽度优先  
84.             if($ratio<</span>$resize_ratio) {  
85.                 $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);  
86.                 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));  
87.                 ImageJpeg ($newimg,$this->dstimg);  
88.             }  
89.         } else {  
90.             //不裁图  
91.             if($ratio>=$resize_ratio) {  
92.                 $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);  
93.                 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);  
94.                 ImageJpeg ($newimg,$this->dstimg);  
95.             }  
96.             if($ratio<</span>$resize_ratio) {  
97.                 $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);  
98.                 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);  
99.                 ImageJpeg ($newimg,$this->dstimg);  
100.             }  
101.         }  
102.     }  
103.   
104. //初始化图象  
105.     function initi_img() {  
106.         if($this->type=="jpg") {  
107.             $this->im = imagecreatefromjpeg($this->srcimg);  
108.         }  
109.          
110.         if($this->type=="gif") {  
111.             $this->im = imagecreatefromgif($this->srcimg);  
112.         }  
113.          
114.         if($this->type=="png") {  
115.             $this->im = imagecreatefrompng($this->srcimg);  
116.         }  
117.          
118.         if($this->type=="bmp") {  
119.             $this->im = $this->imagecreatefrombmp($this->srcimg);  
120.         }  
121.     }  
122.   
123. //图象目标地址  
124.     function dst_img($dstpath) {  
125.         $full_length  = strlen($this->srcimg);  
126.         $type_length  = strlen($this->type);  
127.         $name_length  = $full_length-$type_length;  
128.         $name = substr($this->srcimg,0,$name_length-1);  
129.         $this->dstimg = $dstpath;  
130.         //echo $this->dstimg;  
131.     }  
132.      
133.     function ConvertBMP2GD($src, $dest = false) {  
134.         if(!($src_f = fopen($src, "rb"))) {  
135.             return false;  
136.         }  
137.         if(!($dest_f = fopen($dest, "wb"))) {  
138.             return false;  
139.         }  
140.         $header = unpack("vtype/Vsize/v2reserved/Voffset", fread($src_f,14));  
141.         $info = unpack("Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant", fread($src_f, 40));  
142.          
143.         extract($info);  
144.         extract($header);  
145.          
146.         if($type != 0x4D42) { // signature "BM"  
147.             return false;  
148.         }  
149.          
150.         $palette_size = $offset - 54;  
151.         $ncolor = $palette_size / 4;  
152.         $gd_header = "";  
153.         // true-color vs. palette  
154.         $gd_header .= ($palette_size == 0) ? "\xFF\xFE" : "\xFF\xFF";  
155.         $gd_header .= pack("n2", $width, $height);  
156.         $gd_header .= ($palette_size == 0) ? "\x01" : "\x00";  
157.         if($palette_size) {  
158.             $gd_header .= pack("n", $ncolor);  
159.         }  
160.         // no transparency  
161.         $gd_header .= "\xFF\xFF\xFF\xFF";  
162.   
163. fwrite($dest_f, $gd_header);  
164.   
165. if($palette_size) {  
166.             $palette = fread($src_f, $palette_size);  
167.             $gd_palette = "";  
168.             $j = 0;  
169.             while($j < $palette_size) {  
170.                 $b = $palette{$j++};  
171.                 $g = $palette{$j++};  
172.                 $r = $palette{$j++};  
173.                 $a = $palette{$j++};  
174.                 $gd_palette .= "$r$g$b$a";  
175.             }  
176.             $gd_palette .= str_repeat("\x00\x00\x00\x00", 256 - $ncolor);  
177.             fwrite($dest_f, $gd_palette);  
178.         }  
179.   
180. $scan_line_size = (($bits * $width) + 7) >> 3;  
181.         $scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size &  
182.         0x03) : 0;  
183.   
184. for($i = 0, $l = $height - 1; $i < $height; $i++, $l--) {  
185.             // BMP stores scan lines starting from bottom  
186.             fseek($src_f, $offset + (($scan_line_size + $scan_line_align) * $l));  
187.             $scan_line = fread($src_f, $scan_line_size);  
188.             if($bits == 24) {  
189.                 $gd_scan_line = "";  
190.                 $j = 0;  
191.                 while($j < $scan_line_size) {  
192.                     $b = $scan_line{$j++};  
193.                     $g = $scan_line{$j++};  
194.                     $r = $scan_line{$j++};  
195.                     $gd_scan_line .= "\x00$r$g$b";  
196.                 }  
197.             }  
198.             else if($bits == 8) {  
199.                 $gd_scan_line = $scan_line;  
200.             }  
201.             else if($bits == 4) {  
202.                 $gd_scan_line = "";  
203.                 $j = 0;  
204.                 while($j < $scan_line_size) {  
205.                     $byte = ord($scan_line{$j++});  
206.                     $p1 = chr($byte >> 4);  
207.                     $p2 = chr($byte & 0x0F);  
208.                     $gd_scan_line .= "$p1$p2";  
209.                 }  
210.                 $gd_scan_line = substr($gd_scan_line, 0, $width);  
211.             }  
212.             else if($bits == 1) {  
213.                 $gd_scan_line = "";  
214.                 $j = 0;  
215.                 while($j < $scan_line_size) {  
216.                     $byte = ord($scan_line{$j++});  
217.                     $p1 = chr((int) (($byte & 0x80) != 0));  
218.                     $p2 = chr((int) (($byte & 0x40) != 0));  
219.                     $p3 = chr((int) (($byte & 0x20) != 0));  
220.                     $p4 = chr((int) (($byte & 0x10) != 0));  
221.                     $p5 = chr((int) (($byte & 0x08) != 0));  
222.                     $p6 = chr((int) (($byte & 0x04) != 0));  
223.                     $p7 = chr((int) (($byte & 0x02) != 0));  
224.                     $p8 = chr((int) (($byte & 0x01) != 0));  
225.                     $gd_scan_line .= "$p1$p2$p3$p4$p5$p6$p7$p8";  
226.                 }  
227.                 $gd_scan_line = substr($gd_scan_line, 0, $width);  
228.             }  
229.             fwrite($dest_f, $gd_scan_line);  
230.         }  
231.         fclose($src_f);  
232.         fclose($dest_f);  
233.         return true;  
234.     }  
235.   
236. function imagecreatefrombmp($filename) {  
237.         $tmp_name = tempnam("/tmp", "GD");  
238.         if($this->ConvertBMP2GD($filename, $tmp_name)) {  
239.             $img = imagecreatefromgd($tmp_name);  
240.             unlink($tmp_name);  
241.             return $img;  
242.         }  
243.         return false;  
244.     }  
245.      
246. }  

源代码下载链接：

                      http://download.csdn.net/detail/toss156/3830291