Replaced Characters in Titles under UTF-8

[effleurager]

Downloading videos with, or without a custom title, results in special characters being replaced by underscores; when this video is downloaded (https://www.youtube.com/watch?v=WStm9fBJDnM), the pipe symbol in its title is removed. even though all locale data is listed as UTF-8. Since "--restrict-filenames" is not used, file naming is unusual - files can have special symbols in on my filesystem (ext4)

$ locale

LANG=en_US.UTF-8
LANGUAGE=en_US.UTF-8
LC_CTYPE="en_US.UTF-8"
LC_NUMERIC="en_US.UTF-8"
LC_TIME="en_US.UTF-8"
LC_COLLATE="en_US.UTF-8"
LC_MONETARY="en_US.UTF-8"
LC_MESSAGES="en_US.UTF-8"
LC_PAPER="en_US.UTF-8"
LC_NAME="en_US.UTF-8"
LC_ADDRESS="en_US.UTF-8"
LC_TELEPHONE="en_US.UTF-8"
LC_MEASUREMENT="en_US.UTF-8"
LC_IDENTIFICATION="en_US.UTF-8"
LC_ALL=en_US.UTF-8

[debug] System config: []
[debug] User config: [u'--add-metadata', u'-o', u'%(upload_date)s - %(title)s.%(ext)s', u'-cf', u'bestvideo[ext=mp4][width<=1920]+bestaudio[ext=m4a]', u'--embed-thumbnail', u'--embed-subs', u'--exec', u'IFS=$n && j={} && k=`expr length $j` && l=`expr $k - 15` && notify-send "YouTube DL" --icon /usr/local/bin/icon.png "`expr substr $j 12 $l`"']
[debug] Command-line args: [u'https://www.youtube.com/watch?v=WStm9fBJDnM', u'-v']
[debug] Encodings: locale UTF-8, fs UTF-8, out UTF-8, pref UTF-8
[debug] youtube-dl version 2015.06.15
[debug] Python version 2.7.9 - Linux-3.19.0-21-generic-x86_64-with-Ubuntu-15.04-vivid
[debug] exe versions: avconv 11.2-6, avprobe 11.2-6
[debug] Proxy map: {}

[dstftw]

This is general precaution. Some filesystems does not support characters like | or ? in filename/path, that's why these and some another insane characters are dropped/replaced with underscore. --restrict-filenames is much stricter - it restricts to only ASCII.

[effleurager]

As a suggestion, perhaps such behaviour could be disabled via a flag, in a future build?

[dstftw]

Maybe, create a new issue for that.