It would fail if you run 'youtube-dl --no-part URL' a second time when the file has already been downloaded. (Reported in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1195779)
fix youporn extractor's json search regex
Fixes #5112
Fixes #2865, closes #5087
[lynda] Check for the empty subtitles
It automatically handles the '-' filename as stdin
It handles encodings better, for example for 'http://www.npo.nl/nos-journaal/14-02-2015/POW_00942207'
Some, if not all, of the videos appear to be geo-blocked (Sweden). Test might fail (403 Forbidden) if not run through a Swedish connection.
The newlines at the end are important, they separate each piece of text.
[lynda] Fixed subtitles broken file