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ffmpeg生成视频缩略图

2018-07-13 17:38:00

php使用ffmpeg生成视频缩略图

简单方法

  1. /**
  2. * Name: ffmpeg.php.
  3. * Author: JiaMeng <666@majiameng.com>
  4. * Date: 2018/7/12 14:39
  5. * Description: ffmpeg.php.
  6. */
  7. class ffmpeg{
  8. const FFMPEG_COVER_COMMAND = '/usr/local/ffmpeg/bin/ffmpeg -i "%s" -y -f mjpeg -ss %s -t 0.001 -s "%s" "%s"';//获取视频封面
  9. /**
  10. * Description: 获取视频封面
  11. * Author: JiaMeng <666@majiameng.com>
  12. * @param string $file 视频文件路径
  13. * @param string $videoCoverName 生成的封面文件路径
  14. * @param string $resolution 分辨率
  15. * @param int $time 截取封面图的开始时间
  16. * @return bool
  17. */
  18. static public function getVideoCover($file,$videoCoverName,$resolution='320x240',$time=1){
  19. $command = sprintf(self::FFMPEG_COVER_COMMAND, $file,$time,$resolution,$videoCoverName);
  20. exec($command.' 2>&1 ',$output, $status);
  21. if($status == 0){
  22. return true;//生成成功
  23. }
  24. echo '生成视频封面:请检查文件上传目录权限,error:'.implode(',',$output));//输出异常
  25. }

复杂方法

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


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