Fix the times for each subtitle in a srt subtitle file

fix-subtitle-times.php

<?php
/**
 * Adds the given seconds to the subtitle file
 * @author [email protected] 
 */

if ($argc < 2) {
    echo "Usage: $argv[0] filename seconds [speed]
    filename - name of subtitle file to read
    seconds - amount of seconds to add to the times. If subtracting use negative values. eg: \"-5\"
    speed - optionally you can add 1 second every [speed] seconds
    slow - optionally you can minus 1 second every [speed] seconds
    ";
    return;
}

$file = $argv[1]; // subs file
$secs = $argv[2]; // time in seconds to add
$speed = $argv[3]; // add 1 second each [speed] seconds
$slow = $argv[4]; // minus 1 second each [speed] seconds

$file2 = preg_replace('/(\.[a-z]+)$/i', ".$secs$1", $file); // file to write subs to

echo "Opening subtitle file $file.\n";
echo "Copying subtitle file: $file2.\n";

echo "Adding $secs seconds to each subtitle.\n";

$fp = fopen($file, 'r'); // sub file stream
$fp2 = fopen($file2, 'w'); // tmp file stream

while($line = fgets($fp)) { // read line from sub file
    $line = addTimeToLine($line); 
    fputs($fp2, $line); // write line to tmp file
}

function addTimeToLine($line)
{
    global $secs, $speed, $slow;
    $add = 0;

    if (preg_match_all("/[0-9]+:[0-9]+:[0-9]+/", $line, $matches)) {
        foreach($matches[0] as $time) {
            if ($speed) {
                // @todo implement
            }
            $time2 = date('H:i:s', (strtotime($time) + $secs + $add));
            $line = str_replace($time, $time2, $line);
        }
    }
    return $line;
}

Eg: To increase times by 5 seconds since subtitles are appearing 5 seconds before person speaks.

php fix-subtitle-times.php 5