php 使用 ffmpeg 转换视频，截图，并生成缩略图
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->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;//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 < $palette_size) {$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++, $l--) {// BMP stores scan lines starting from bottomfseek($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;}} 源代码下载链接：http://download.csdn.net/detail/toss156/3830291
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