PHP基于ffmpeg实现转换视频，截图及生成缩略图的方式

发布时间：2023-09-20 10:23:07 所属栏目：PHP教程来源：

导读：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

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=newImageResize();
$thumbnail->resizeimage("1.jpg", 30,30, 0,"small1.jpg");
classImageResize {
//图片类型
var$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;
functionresizeimage($img,$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);
}
functionnewimg() {
//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,$this->dstimg);
}
}
}
//初始化图象
functioniniti_img() {
if($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($this->srcimg);
}
}
//图象目标地址
functiondst_img($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 $this->dstimg;
}
functionConvertBMP2GD($src,$dest= false) {
if(!($src_f=fopen($src,"rb"))) {
returnfalse;
}
if(!($dest_f=fopen($dest,"wb"))) {
returnfalse;
}
$header= unpack("vtype/Vsize/v2reserved/Voffset",fread($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"
returnfalse;
}
$palette_size=$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";
}
}
elseif($bits== 8) {
$gd_scan_line=$scan_line;
}
elseif($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,$width);
}
elseif($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($dest_f);
returntrue;
}
functionimagecreatefrombmp($filename) {
$tmp_name= tempnam("/tmp","GD");
if($this->ConvertBMP2GD($filename,$tmp_name)) {
$img= imagecreatefromgd($tmp_name);
unlink($tmp_name);
return$img;
}
returnfalse;
}
}

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