这篇文章主要介绍了关于实现利用php获得flv视频长度的实例代码,有着一定的参考价值,现在分享给大家,有需要的朋友可以参考一下

废话不多说了,直接给大家贴代码了,具体代码如下所示:

function BigEndian2Int($byte_word, $signed = false) { $int_value = 0; $byte_wordlen = strlen($byte_word); for ($i = 0; $i < $byte_wordlen; $i++) { $int_value += ord($byte_word{$i}) * pow(256, ($byte_wordlen - 1 - $i)); } if ($signed) { $sign_mask_bit = 0x80 << (8 * ($byte_wordlen - 1)); if ($int_value & $sign_mask_bit) { $int_value = 0 - ($int_value & ($sign_mask_bit - 1)); } } return $int_value; } //获得视频的数字时间 function getFlvDuration($name){ if(!file_exists($name)){ return; } $flv_data_length=filesize($name); $fp = @fopen($name, 'r'); $flv_header = fread($fp, 5); fseek($fp, 5, SEEK_SET); $frame_size_data_length = $this->BigEndian2Int(fread($fp, 4)); $flv_header_frame_length = 9; if ($frame_size_data_length > $flv_header_frame_length) { fseek($fp, $frame_size_data_length - $flv_header_frame_length, SEEK_CUR); } $duration = 0; while ((ftell($fp) + 1) < $flv_data_length) { $this_tag_header = fread($fp, 16); $data_length = $this->BigEndian2Int(substr($this_tag_header, 5, 3)); $timestamp = $this->BigEndian2Int(substr($this_tag_header, 8, 3)); $next_offset = ftell($fp) - 1 + $data_length; if ($timestamp > $duration) { $duration = $timestamp; } fseek($fp, $next_offset, SEEK_SET); } fclose($fp); return $duration; } //转化为0:03:56的时间格式 function getFlvTime($time){ $num = $time; $sec = intval($num/1000); $h = intval($sec/3600); $m = intval(($sec%3600)/60); $s = intval(($sec%60)); $tm = $h.':'.$m.':'.$s; return $tm; }

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