PHP基于ffmpeg实现转换视频，截图及生成缩略图的方法
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
$cmd="ffmpeg.exe-istarwar.avi-ab56-ar22050-b500-r15-s320x2401.flv";
exec($cmd);
//视频截图
$cmd="ffmpeg.exe-istarwar.avi-fimage2-ss10-s400*300-vframes11.jpg";
exec($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-colorvs.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);
}
//notransparency
$gd_header.="\xFF\xFF\xFF\xFF";
fwrite($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--){
//BMPstoresscanlinesstartingfrombottom
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;
}
}
附：完整实例代码点击此处本站下载。
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希望本文所述对大家PHP程序设计有所帮助。