本文实例讲述了PHP基于ffmpeg实现转换视频，截图及生成缩略图的方法。分享给大家供大家参考，具体如下：

这里把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

$newimg = imagecreatetruecolor($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

$newimg = imagecreatetruecolor(($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 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;

}

}

附：完整实例代码点击此处本站下载。

希望本文所述对大家PHP程序设计有所帮助。