Time shift for SRT subtitles

This utility allows to shift subtitles time

#!/usr/bin/perl -pl
# time shift for srt subtitles

BEGIN {
    ($dt = shift @ARGV) != 0
        or print "Usage: $0 SECONDS file" and exit;
}

s{ (\d+) : (\d\d) : (\d\d) , (\d+) }
 { my @t = ($1, $2, $3, $4 + $dt * 1E3);
   $t[2] += $t[3] / 1E3; $t[3] %= 1E3;
   $t[1] += $t[2] / 60;  $t[2] %= 60;
   $t[0] += $t[1] / 60;  $t[1] %= 60;
   sprintf '%02d:%02d:%02d,%03d', @t;
 }gxe;
[download]

Comment on Time shift for SRT subtitles Download Code

Replies are listed 'Best First'.
Re: Time shift for SRT subtitles by Anonymous Monk on Feb 19, 2012 at 14:48 UTC
Hi, thanks for your idea for subtitle shifting. Unfortunately your code has a bug for negative time shifts. Here is alternative code that avoids the bug alltogether by first calculating the new time (in ms) and working out the other time values from there. `s{ (\d+) : (\d\d) : (\d\d) , (\d+) } { $time = $1 * 3600E3 + $2 * 60E3 + ($3 + $dt) * 1E3 + $4; $h = int $time / 3600E3; $time %= 3600E3; $m = int $time / 60E3; $time %= 60E3; $s = int $time / 1E3; $time %= 1E3; $ms = int $time; sprintf "%02d:%02d:%02d,%03d", $h, $m, $s, $ms; }gxe;` [download]	[reply] [d/l]
Re: Time shift for SRT subtitles by jdrago_999 (Hermit) on Sep 17, 2009 at 23:34 UTC
by "srt" tables - do you mean closed caption data?	[reply]
Re^2: Time shift for SRT subtitles by ccn (Vicar) on Sep 18, 2009 at 15:20 UTC
Not tables but subtitles :) I mean this specification: http://en.wikipedia.org/wiki/SubRip Those files have .srt extension.	[reply]


Do you know where your variables are?
	PerlMonks