当时获得视频长度是采用网上的通用的获得flv视频文件长度的方法,但是这个方法只对flv视频支持,其他格式的视频获取到的值就很差了,
下面在介绍一种:利用ffmpeg返回值Duration的方法,原来也想过用,但是没有解决,现在可以了,由于ffmpeg支持很多种格式的视频,所以这个具体一定的通用性。
ffmpeg获得视频时间长度的Duration的linux命令:
ffmpeg -i test.flv 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//
可以获得Duration;看下图
命令分析:
grep命令:匹配查找文件里符合条件的字符串,这里查找Duration字段
cut:以空格为分割符,查询第四个元素,cut是很好的切割命令
下面附几个cut的实例:
#ffmpeg -i test.flv
输入下面信息:
①获得creationdate:文件创建时间
ffmpeg -i test.flv 2>&1 | grep 'creationdate' | cut -d ' ' -f 5-
说明:Cut是文本截取命令:以空格作为分隔符,截取第5位以后的字段,
如果想要截取: 第5个元素和第8个元素,应该这样写:
ffmpeg -i test.flv 2>&1 | grep 'creationdate' | cut -d ' ' -f 5,8
②获得视频尺寸大小
使用cut截取以空格为分隔符的第十个元素也是视频尺寸
ffmpeg -i test.flv 2>&1 | grep 'Video' | cut -d ' ' -f 10 | sed s/,//
sed命令:sed ‘s/要替换的字符串/新字符串/g'
例如:sed s/,//:表示:用空白符替换','号
下面是利用获得视频缩略图和视频总长度时间的代码:
复制代码 代码如下:
/*
* 获得视频文件的缩略图和视频长度
*需要ffmpeg支持
* @author PHP淮北
* @date 2011-09-14
* @copyright PHP淮北
*/
//获得视频文件的总长度时间和创建时间
function getTime($file){
$vtime = exec("ffmpeg -i ".$file." 2>&1 | grep 'Duration' | cut -d ' ' -f 4 | sed s/,//");//总长度
$ctime = date("Y-m-d H:i:s",filectime($file));//创建时间
//$duration = explode(":",$time);
// $duration_in_seconds = $duration[0]*3600 + $duration[1]*60+ round($duration[2]);//转化为秒
return array('vtime'=>$vtime,
'ctime'=>$ctime
);
}
//获得视频文件的缩略图
function getVideoCover($file,$time) {
if(empty($time))$time = '1';//默认截取第一秒第一帧
$strlen = strlen($file);
$videoCover = substr($file,0,$strlen-4);
$videoCoverName = $videoCover.'.jpg';//缩略图命名
exec("ffmpeg -i ".$file." -y -f mjpeg -ss ".$time." -t 0.001 -s 320x240 ".$videoCoverName."",$out,$status);
if($status == 0)return $videoCoverName;
elseif ($status == 1)return FALSE;
}
//调用方法
$duration = getTime('/usr/local/apache/htdocs/test.flv');
echo $duration['vtime'].'
';//总长度
echo $duration['ctime'].'
';//创建时间
$videoCoverName = getVideoCover('/usr/local/apache/htdocs/test.flv', 6);
echo $videoCoverName;//获得缩略图名称
?>
测试效果:
视频长度是:55秒43
视频创建时间;2011-9-13
视频缩略图:test.jpg
-----------------------------测试完全ok
补充:如果想获得视频文件的大小可以使用:
filesize()
filesize() 函数用于取得文件大小默认单位是:bytes,成功返回文件大小的字节数,否则返回 FALSE 。

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