Skip to main content

Convert & Calculate the length of an flv video

You can convert an flv video into a wmv video using the command line:
ffmpeg -i test.flv test.wmv

Through the above command, the "test.flv" video file is converted to "test.wmv" video file.
Note that you need the file "ffmpeg.exe" in the folder from where you invoke the above command.

And you can dynamically calculate the length of an flv video, using the function below:

<?php
function GetFLVDuration($file){
// get contents of a file into a string
if (file_exists($file)){
$handle = fopen($file, "r");
$contents = fread($handle, filesize($file));
fclose($handle);
//
if (strlen($contents) > 3){
if (substr($contents,0,3) == "FLV"){
$taglen = hexdec(bin2hex(substr($contents,strlen($contents)-3)));
if (strlen($contents) > $taglen){
$duration = hexdec(bin2hex(substr($contents,strlen($contents)-$taglen,3))) ;
return secondsToWords($duration/1000);
}
}
}
}
return false;
}
?>

An example of invoking the function:

<?php
$duration = GetFLVDuration("test.flv");
echo $duration;
?>

Note that the duration of the video is returned in seconds, which is passed to another function (secondsToWords) to get the output in a readable form (in minutes and seconds).

<?php
function secondsToWords($seconds)
{
/*** return value ***/
$ret = "";

/*** get the hours ***/
$hours = intval(intval($seconds) / 3600);
if($hours > 0)
{
$ret .= "$hours hours ";
}
/*** get the minutes ***/
$minutes = bcmod((intval($seconds) / 60),60);
if($hours > 0 || $minutes > 0)
{
$ret .= "$minutes minutes ";
}

/*** get the seconds ***/
$seconds = bcmod(intval($seconds),60);
$ret .= "$seconds seconds";

return $ret;
}
?>

However you can also get the duration of a wmv-converted flv video using the command line:
ffmpeg -i test.wmv

When you run this, you get a list of details and from that list, you can get the duration from the line, starting with: "Duration: "

For ex, Duration: 00:03:45.2 (means 3 minutes, 45 seconds)

Comments

Popular posts from this blog

php strip all tags

The below function can strip almost all tags from a string. function strip_all_tags($string) {     $string = preg_replace( '@<(script|style)[^>]*?>.*?@si', '', $string );     $string = strip_tags($string);     return trim($string); } $a = '<script type="text/javascript" src="jquery.js"></script> <div id="test" style="padding:5px; color:red;">Hello world</div>'; echo strip_all_tags($a); // outputs: Hello world

Joomla validate chrono forms using jquery

It is a common practice to use Chrono forms in our joomla site to setup various forms in the site, be it a contact us form, submit a ticket form, or whatever. I have set the option "validate form" to "No" under chronoform settings in admin panel, and also preferred to not include any js or css files. For validating the chrono forms, i prefer jquery. So first lets add jquery support in our joomla. It is quite simple: 1. Download jquery.js and jquery_min.js (1.4.2 version is enough) and place them in media/system/js folder of your joomla. 2. Edit libraries->joomla->html->html->behavior.php, and add the following function below the mootools() function: function jQuery($debug = null)     {         static $loaded;         global $mainframe;         // Only load once         if ($loaded) {    ...

php get content between tags

This involves parsing the dom document. <?php function getTextBetweenTags($tag, $html) {     $dom = new domDocument;     @$dom->loadHTML($html);         $dom->preserveWhiteSpace = false;     $content = $dom->getElementsByTagname($tag);     $out = array();         foreach ($content as $item)     {         $out[] = $item->nodeValue;     }     return $out; } $xhtml = '<tag>abc def</tag><tag>123 456</tag>'; $content2 = getTextBetweenTags('tag', $xhtml); foreach( $content2 as $item ) {     echo $item.'<br />'; } ?> Output: abc def 123 456