Automatically trimming an mp3 in PHP

You could try the MP3 Class on PHPClasses. It features the following example:

require_once './class.mp3.php';$mp3 = new mp3;$mp3->cut_mp3('input.mp3', 'output.mp3', 0, -1, 'frame', false);

In this case, the 'frame' can be substituted with 'second' to base the cut on a time-frame.

I used PHP MP3 for my project.

<?php//Extract 30 seconds starting after 10 seconds.$path = 'path.mp3';$mp3 = new PHPMP3($path);$mp3_1 = $mp3->extract(10,30);$mp3_1->save('newpath.mp3');?>

For your case you can use extract(0,30) or extract(30,60).

I put together a script that outputs a 30 second clip of an MP3 file on the fly. If you're looking to save the file, one of the other options using a class/library will probably be best. But, if you just want to play/download the preview, on the fly might be better. It will definitely save you hard drive space.

Check it out at http://www.stephenwalcher.com/2013/06/17/how-to-extract-and-play-part-of-an-mp3-in-php/.

Here's the code, but a deeper explanation can be found on my blog.

$getID3 = new getID3();$id3_info = $getID3->analyze($filename);list($t_min, $t_sec) = explode(':', $id3_info['playtime_string']);$time = ($t_min * 60) + $t_sec;$preview = $time / 30; // Preview time of 30 seconds$handle = fopen($filename, 'r');$content = fread($handle, filesize($filename));$length = strlen($content);if (!$session->IsLoggedIn()) {    $length = round(strlen($content) / $preview);    $content = substr($content, $length / 3 /* Start extraction ~10 seconds in */, $length);}header("Content-Type: {$id3_info['mime_type']}");header("Content-Length: {$length}");print $content;