一、PHP實現轉換

　　　在做視頻網站的時候，最頭痛的問題可能是格式轉換、視頻縮略圖等。下面我將用PHP實現這一些功能。PHP是沒有自帶視頻的函數，所以會用到第三方的軟件工具來實現。

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二、什么是FFmpeg

　　　FFmpeg是一個開源免費跨平臺的視頻和音頻流方案，屬于自由軟件，采用LGPL或GPL許可證（依據你選擇的組件）。它提供了錄制、轉換以及流化音視頻的完整解決方案。它包含了非常先進的音頻/視頻編解碼庫libavcodec，為了保證高可移植性和編解碼質量，libavcodec里很多codec都是從頭開發的。

FFmpeg在Linux平臺下開發，但它同樣也可以在其它操作系統環境中編譯運行，包括Windows、Mac OS X等。

這個項目最早由Fabrice Bellard發起，現在由Michael Niedermayer維護。許多FFmpeg的開發人員都來自MPlayer項目，而且當前FFmpeg也是放在MPlayer項目組的服務器上。項目的名稱來自MPEG視頻編碼標準，前面的"FF“代表"Fast Forward“。更多詳情》 /* 轉視頻 */ $cmd="ffmpeg.exe -i tiwer_update_move.avi -ab 56 -ar 22050 -b 500 -r 15 -s 500x600 201112120089123.flv"; exec($cmd); /* 視頻截圖*/ $cmd="ffmpeg.exe -itiwer_update_move.avi -f image2 -ss 10 -s 600*500 -vframes 1 201112120089123.jpg"; exec($cmd);

?三、生成縮略圖

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include("ImageHelper.class.php");/* 生成縮略圖 */$thumbnail = new ImageHelper(); $thumbnail->resizeimage("2012121208123.jpg", 30,30, 0, "2012121208123_small.jpg");

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四、工具類與軟件下載

　　４.１ 圖片處理工具類如下

ImageHelper.class.php 1 /**
2 * 圖片處理工具
3 *
4 * Project: BoBo Manage System
5 * This is NOT a freeware, use is subject to license terms!
6 *
7 * Site: http://www.bobo123.cn
8 *
9 * $Id: ImageHelper.class.php 269 2011-03-08 00:44:01Z wgw8299 $
10 *
11 * Copyright ? 2007-2012 Bobo123.CN Developer Team. All Rights Reserved.
12 */
13 class ImageHelper {
14
15
16 var $type;
17
18
19 /* 實際寬度 */
20 var $width;
21
22 /* 實際高度 */
23 var $height;
24
25 /* 改變后的寬度 */
26 var $resize_width;
27
28 /* 改變后的高度 */
29 var $resize_height;
30
31 /* 是否裁圖 */
32 var $cut;
33
34 /* 源圖象 */
35 var $srcimg;
36
37 /* 目標圖象地址 */
38 var $dstimg;
39
40 /* 臨時創建的圖象 */
41 var $im;
42
43 function resizeimage($img, $wid, $hei,$c,$dstpath) {
44
45 $this->srcimg = $img;
46 $this->resize_width = $wid;
47 $this->resize_height = $hei;
48 $this->cut = $c;
49
50 /* 圖片的類型 */
51 $this->type = strtolower(substr(strrchr($this->srcimg,"."),1));
52
53 /* 初始化圖象 */
54 $this->initi_img();
55
56 /* 目標圖象地址 */
57 $this -> dst_img($dstpath);
58
59
60 $this->width = imagesx($this->im);
61 $this->height = imagesy($this->im);
62
63 /* 生成圖象 */
64 $this->newimg();
65
66 ImageDestroy ($this->im);
67 }
68
69 function newimg() {
70
71 /* 改變后的圖象的比例 */
72 $resize_ratio = ($this->resize_width)/($this->resize_height);
73
74 /* 實際圖象的比例 */
75 $ratio = ($this->width)/($this->height);
76
77
78 if(($this->cut)=="1") {
79 /* 裁圖高度優先 */
80 if($ratio>=$resize_ratio){
81 $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
82 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width,$this->resize_height, (($this->height)*$resize_ratio), $this->height);
83 ImageJpeg ($newimg,$this->dstimg);
84 }
85
86
87 /* 裁圖 寬度優先 */
88 if($ratio<$resize_ratio) {
89 $newimg = imagecreatetruecolor($this->resize_width,$this->resize_height);
90 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, $this->resize_height, $this->width, (($this->width)/$resize_ratio));
91 ImageJpeg ($newimg,$this->dstimg);
92 }
93 } else {
94
95 /* 不裁圖 */
96 if($ratio>=$resize_ratio) {
97 $newimg = imagecreatetruecolor($this->resize_width,($this->resize_width)/$ratio);
98 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, $this->resize_width, ($this->resize_width)/$ratio, $this->width, $this->height);
99 ImageJpeg ($newimg,$this->dstimg);
100 }
101 if($ratio<$resize_ratio) {
102 $newimg = imagecreatetruecolor(($this->resize_height)*$ratio,$this->resize_height);
103 imagecopyresampled($newimg, $this->im, 0, 0, 0, 0, ($this->resize_height)*$ratio, $this->resize_height, $this->width, $this->height);
104 ImageJpeg ($newimg,$this->dstimg);
105 }
106 }
107 }
108
109 /* 初始化圖象 */
110 function initi_img() {
111 if($this->type=="jpg") {
112 $this->im = imagecreatefromjpeg($this->srcimg);
113 }
114
115 if($this->type=="gif") {
116 $this->im = imagecreatefromgif($this->srcimg);
117 }
118
119 if($this->type=="png") {
120 $this->im = imagecreatefrompng($this->srcimg);
121 }
122
123 if($this->type=="bmp") {
124 $this->im = $this->imagecreatefrombmp($this->srcimg);
125 }
126 }
127
128
129 /* 圖象目標地址 */
130 function dst_img($dstpath) {
131 $full_length = strlen($this->srcimg);
132 $type_length = strlen($this->type);
133 $name_length = $full_length-$type_length;
134 $name = substr($this->srcimg,0,$name_length-1);
135 $this->dstimg = $dstpath;
136 }
137
138
139
140 function ConvertBMP2GD($src, $dest = false) {
141 if(!($src_f = fopen($src, "rb"))) {
142 return false;
143 }
144 if(!($dest_f = fopen($dest, "wb"))) {
145 return false;
146 }
147 $header = unpack("vtype/Vsize/v2reserved/Voffset", fread($src_f,14));
148 $info = unpack("Vsize/Vwidth/Vheight/vplanes/vbits/Vcompression/Vimagesize/Vxres/Vyres/Vncolor/Vimportant", fread($src_f, 40));
149
150 extract($info);
151 extract($header);
152
153 if($type != 0x4D42) { // signature "BM"
154 return false;
155 }
156
157 $palette_size = $offset - 54;
158 $ncolor = $palette_size / 4;
159 $gd_header = "";
160 // true-color vs. palette
161 $gd_header .= ($palette_size == 0) ? "\xFF\xFE" : "\xFF\xFF";
162 $gd_header .= pack("n2", $width, $height);
163 $gd_header .= ($palette_size == 0) ? "\x01" : "\x00";
164 if($palette_size) {
165 $gd_header .= pack("n", $ncolor);
166 }
167
168 $gd_header .= "\xFF\xFF\xFF\xFF";
169
170 fwrite($dest_f, $gd_header);
171
172 if($palette_size) {
173 $palette = fread($src_f, $palette_size);
174 $gd_palette = "";
175 $j = 0;
176 while($j < $palette_size) {
177 $b = $palette{$j++};
178 $g = $palette{$j++};
179 $r = $palette{$j++};
180 $a = $palette{$j++};
181 $gd_palette .= "$r$g$b$a";
182 }
183 $gd_palette .= str_repeat("\x00\x00\x00\x00", 256 - $ncolor);
184 fwrite($dest_f, $gd_palette);
185 }
186
187 $scan_line_size = (($bits * $width) + 7) >> 3;
188 $scan_line_align = ($scan_line_size & 0x03) ? 4 - ($scan_line_size &
189 0x03) : 0;
190
191 for($i = 0, $l = $height - 1; $i < $height; $i++, $l--) {
192 // BMP stores scan lines starting from bottom
193 fseek($src_f, $offset + (($scan_line_size + $scan_line_align) * $l));
194 $scan_line = fread($src_f, $scan_line_size);
195 if($bits == 24) {
196 $gd_scan_line = "";
197 $j = 0;
198 while($j < $scan_line_size) {
199 $b = $scan_line{$j++};
200 $g = $scan_line{$j++};
201 $r = $scan_line{$j++};
202 $gd_scan_line .= "\x00$r$g$b";
203 }
204 }
205 else if($bits == 8) {
206 $gd_scan_line = $scan_line;
207 }
208 else if($bits == 4) {
209 $gd_scan_line = "";
210 $j = 0;
211 while($j < $scan_line_size) {
212 $byte = ord($scan_line{$j++});
213 $p1 = chr($byte >> 4);
214 $p2 = chr($byte & 0x0F);
215 $gd_scan_line .= "$p1$p2";
216 }
217 $gd_scan_line = substr($gd_scan_line, 0, $width);
218 }
219 else if($bits == 1) {
220 $gd_scan_line = "";
221 $j = 0;
222 while($j < $scan_line_size) {
223 $byte = ord($scan_line{$j++});
224 $p1 = chr((int) (($byte & 0x80) != 0));
225 $p2 = chr((int) (($byte & 0x40) != 0));
226 $p3 = chr((int) (($byte & 0x20) != 0));
227 $p4 = chr((int) (($byte & 0x10) != 0));
228 $p5 = chr((int) (($byte & 0x08) != 0));
229 $p6 = chr((int) (($byte & 0x04) != 0));
230 $p7 = chr((int) (($byte & 0x02) != 0));
231 $p8 = chr((int) (($byte & 0x01) != 0));
232 $gd_scan_line .= "$p1$p2$p3$p4$p5$p6$p7$p8";
233 }
234 $gd_scan_line = substr($gd_scan_line, 0, $width);
235 }
236 fwrite($dest_f, $gd_scan_line);
237 }
238 fclose($src_f);
239 fclose($dest_f);
240 return true;
241 }
242
243 function imagecreatefrombmp($filename) {
244 $tmp_name = tempnam("/tmp", "GD");
245 if($this->ConvertBMP2GD($filename, $tmp_name)) {
246 $img = imagecreatefromgd($tmp_name);
247 unlink($tmp_name);
248 return $img;
249 }
250 return false;
251 }
252
253
254 }

?　　4.2 軟件下載

　　FFmpeg官方下載：http://ffmpeg.org/download.html

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轉載于:https://www.cnblogs.com/wgw8299/archive/2011/12/12/2284656.html

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