[FFmpeg]php基于ffmpeg的应用：视频转换/视频截图/生成缩略图

[FFmpeg]php基于ffmpeg的应用：视频转换/视频截图/生成缩略图

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++, $l--) { 
            // BMP stores scan lines starting from bottom 
            fseek($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; 
    } 
    
} 

源代码下载链接：http://download.csdn.net/detail/toss156/3830291