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Get subtitle for TED video
#!/usr/local/bin/perl
################################################################################
# File: tedSubtitle.pl
# Desscription: Get ted talk's subtitle from TED.com
# and convert subtitle of TED video to SRT format(SubRip Subtitle File)
# Usage: ted.pl URL languageCode output.src
# Creator: Thinkhy
# Date: 2011.04.30
# ChangeLog: 1 Add language code. [thinkhy 2011.05.06]
# 2 Read advertisement time from the parameter of introDuration in html.
# If the time is not correct by intorDuratoin parameter,
# you can set it up in the last argument of command line($ARGV[3]). [thinkhy 2011.07.16]
# 3 Optimized code, add code for checking command arguments. [thinkhy 2011.09.3]
# 4 Ajust Regexp for extraction of Adv. duration [thinkhy 2012.01.26]
# 5 Thanks to doyouwanna's bug report, fix the problem of inaccurate advertisement duration which is due to percent-encode in html. [thinkhy 2012.10.21]
# 6 Ted modified js code as below.
# Before: var talkId = 1523;
# After: var talkID = 1523;
# So need to adjust related REGEX to reflect this change.
# Thanks Yan Xue Feng for reporting this bug. [thinkhy 2012.12.22]
#
# LanguageCode Language
# alb Albanian
# ara Arabic
# arm Armenian
# aze Azerbaijani
# bul Bulgarian
# bur Burmese (Myanmar)
# cat Catalan
# chi_hans Chinese (Simplified)
# chi_hant Chinese (Traditional)
# cze Czech
# dan Danish
# dut Dutch
# eng English
# epo Esperanto
# est Estonian
# fin Finnish
# fre_fr French (France)
# geo Georgian
# ger German
# gre Greek
# heb Hebrew
# hun Hungarian
# ind Indonesian
# ita Italian
# jpn Japanese
# kor Korean
# lav Latvian
# lit Lithuanian
# mac Macedonian
# may Malay
# nob Norwegian, Bokm錶 (Bokmaal)
# pol Polish
# por_br Portuguese (Brazil)
# por_pt Portuguese (Portugal)
# rum Romanian
# rus Russian
# scc Serbian
# scr Croatian
# slo Slovak
# slv Slovenian
# swe Swedish
# spa Spanish
# tam Tamil
# tgl Tagalog
# tha Thai
# tur Turkish
# ukr Ukrainian
# uzb Uzbek
# vie Vietnamese
#
################################################################################
use strict;
use Data::Dumper;
use JSON;
use URI::Escape;
use LWP::Simple qw(get);
# check for argument number
my $argc = @ARGV;
if ($argc < 3)
{
print "USAGE: ted.pl URL languageCode output.src\n";
exit -1;
}
# Magic Number
my $durationOfAdv = 16000; # seconds of Advertisement time(millisecond).
# depends on talk year
# Get content from file
# my $content = GetContentFromFile("back.json");
# The TED talk URL
my $url = $ARGV[0];
print "URL: $url\n";
# languageCode
my $languageCode = $ARGV[1];
# output file of SRT format
my $outputFile = $ARGV[2];
# !!Note: What you should do is to write URL of TED talks here.
# my $url = "http://www.ted.com/talks/stephen_wolfram_computing_a_theory_of_everything.html";
# open OUT, ">out.html";
print "Get html content from URL: $url\n";
# First of all, Get the talkID from the web page.
my $html = GetUrl($url);
$html =~ m/(?<=var talkID = ).*?(\d+)/ig;
my $talkID = $1;
print $talkID;
chomp($talkID);
die "Failed to extract talk id.\n" unless($talkID);
print "Talk id: $talkID\n";
my ($talkYear) = $html =~ m/(?<=;year=)(\d+);/i;
#my $talkYear = $1;
print "\nSeems good, go on\n";
chomp($talkYear);
print "Talk year: $talkYear\n";
my $durationOfAdv = $ARGV[3];
if (!$durationOfAdv)
{
if ($html =~ m/(?<=introDuration)\D*(\d+)/i)
{
$durationOfAdv = int($1)*1000;
#$durationOfAdv += 2500;
}
else
{
# print $html; # debug
# Advertisement time depends on talk year.
if ($talkYear == 2005)
{
$durationOfAdv = 15100;
}
elsif ($talkYear == 2009)
{
#$durationOfAdv = 18000;
$durationOfAdv = 15600;
}
}
}
print "Duration of advertisement: $durationOfAdv\n";
#/(?<=\t)\w+/
# print OUT $html;
print "Have got html content from URL: $url\n";
# Get subtitle content from TED.COM
my $subtitleUrl = "http://www.ted.com/talks/subtitles/id/$talkID/lang/$languageCode/format/text";
print "Subtitle URL: $subtitleUrl\n";
my $content = GetUrl($subtitleUrl);
#open DEBUG, ">out.json";
#print DEBUG $content;
# Decode JSON text
open SRT, ">$outputFile";
my $json = new JSON;
my $obj = $json->decode($content);
my $len = scalar(@{$obj->{captions}});
if ($len > 0)
{
print "Subtitle line count: $len\n";
}
else
{
print "NO valid subtitle found!\n";
}
my $startTime = $obj->{captions}->[10]->{startTime};
my $duration = $obj->{captions}->[10]->{duration};
my $subtitle = $obj->{captions}->[10]->{content};
my $cnt = 0;
#foreach my $element ($obj->{captions})
for (;$cnt < $len; $cnt++)
{
#my %hash = %$element;
my $startTime = $obj->{captions}->[$cnt]->{startTime};
my $duration = $obj->{captions}->[$cnt]->{duration};
my $subtitle = $obj->{captions}->[$cnt]->{content};
OutputSrt(1+$cnt, $startTime, $duration, $subtitle);
}
###########################################################
# Sub Functions
###########################################################
sub GetTime
{
my ($time) = @_;
my $mils = $time%1000;
my $segs = int($time/1000)%60;
my $mins = int($time/60000)%60;
my $hors = int($time/3600000);
return ($hors, $mins, $segs, $mils);
}
sub OutputSrt
{
my ($orderNum, $startTime, $duration, $subtitle) = @_;
# plus the duration of advertisement
$startTime += $durationOfAdv;
# Caculate endTime by duration
my $endTime = $startTime + $duration;
my($hour, $minute, $second, $msecond) = GetTime($startTime);
print SRT "$orderNum\n"; # order number
# Begin time
print SRT $hour.":".$minute.":".$second.",$msecond";
# delimitation
print SRT " --> ";
# End time
my($hour1, $minute1, $second1) = GetTime($endTime);
print SRT $hour1.":".$minute1.":".$second1.",$msecond\n";
# Subtitle
print SRT "$subtitle\n\n";
}
sub GetContentFromFile
{
my $file = shift;
my $content;
open FILE, $file;
while(<FILE>) {
$content .= "$_";
}
return $content;
}
# Test URL: http://www.ted.com/talks/subtitles/id/843/lang/eng/format/text
sub GetUrl
{
my $url = shift;
my $content = get($url) or die "Can't get $url\n";
# Thanks to doyouwanna's bug report,
# fix the problem of inaccurate advertisement duration which is due to percent-encode in html. [thinkhy 2012.10.21]
my $encode = uri_unescape($content);
return $encode;
}
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