When using the mpegts container hls vidoes can be played while being downloaded (useful if you are recording a live stream).
VLC and mpv play them file, but QuickTime doesn't.
If someone is running youtube-dl on a server to deliver files, the user could input 'file:///some/important/file' and youtube-dl would save that file as a video giving access to sensitive information to the user.
'file:' urls can be filtered, but the user can use an URL to a crafted m3u8 manifest like:
#EXTM3U
#EXT-X-MEDIA-SEQUENCE:0
#EXTINF:10.0
file:///etc/passwd
#EXT-X-ENDLIST
With this patch 'file:' URLs raise URLError like for unknown protocols.
compat_urllib_request.Request
[downloader/dash] Use sanitized_Request
[downloader/http] Use sanitized_Request
[atresplayer] Use sanitized_Request
[bambuser] Use sanitized_Request
[bliptv] Use sanitized_Request
[brightcove] Use sanitized_Request
[cbs] Use sanitized_Request
[ceskatelevize] Use sanitized_Request
[collegerama] Use sanitized_Request
[extractor/common] Use sanitized_Request
[crunchyroll] Use sanitized_Request
[dailymotion] Use sanitized_Request
[dcn] Use sanitized_Request
[dramafever] Use sanitized_Request
[dumpert] Use sanitized_Request
[eitb] Use sanitized_Request
[escapist] Use sanitized_Request
[everyonesmixtape] Use sanitized_Request
[extremetube] Use sanitized_Request
[facebook] Use sanitized_Request
[fc2] Use sanitized_Request
[flickr] Use sanitized_Request
[4tube] Use sanitized_Request
[gdcvault] Use sanitized_Request
[extractor/generic] Use sanitized_Request
[hearthisat] Use sanitized_Request
[hotnewhiphop] Use sanitized_Request
[hypem] Use sanitized_Request
[iprima] Use sanitized_Request
[ivi] Use sanitized_Request
[keezmovies] Use sanitized_Request
[letv] Use sanitized_Request
[lynda] Use sanitized_Request
[metacafe] Use sanitized_Request
[minhateca] Use sanitized_Request
[miomio] Use sanitized_Request
[meovideo] Use sanitized_Request
[mofosex] Use sanitized_Request
[moniker] Use sanitized_Request
[mooshare] Use sanitized_Request
[movieclips] Use sanitized_Request
[mtv] Use sanitized_Request
[myvideo] Use sanitized_Request
[neteasemusic] Use sanitized_Request
[nfb] Use sanitized_Request
[niconico] Use sanitized_Request
[noco] Use sanitized_Request
[nosvideo] Use sanitized_Request
[novamov] Use sanitized_Request
[nowness] Use sanitized_Request
[nuvid] Use sanitized_Request
[played] Use sanitized_Request
[pluralsight] Use sanitized_Request
[pornhub] Use sanitized_Request
[pornotube] Use sanitized_Request
[primesharetv] Use sanitized_Request
[promptfile] Use sanitized_Request
[qqmusic] Use sanitized_Request
[rtve] Use sanitized_Request
[safari] Use sanitized_Request
[sandia] Use sanitized_Request
[shared] Use sanitized_Request
[sharesix] Use sanitized_Request
[sina] Use sanitized_Request
[smotri] Use sanitized_Request
[sohu] Use sanitized_Request
[spankwire] Use sanitized_Request
[sportdeutschland] Use sanitized_Request
[streamcloud] Use sanitized_Request
[streamcz] Use sanitized_Request
[tapely] Use sanitized_Request
[tube8] Use sanitized_Request
[tubitv] Use sanitized_Request
[twitch] Use sanitized_Request
[twitter] Use sanitized_Request
[udemy] Use sanitized_Request
[vbox7] Use sanitized_Request
[veoh] Use sanitized_Request
[vessel] Use sanitized_Request
[vevo] Use sanitized_Request
[viddler] Use sanitized_Request
[videomega] Use sanitized_Request
[viewvster] Use sanitized_Request
[viki] Use sanitized_Request
[vk] Use sanitized_Request
[vodlocker] Use sanitized_Request
[voicerepublic] Use sanitized_Request
[wistia] Use sanitized_Request
[xfileshare] Use sanitized_Request
[xtube] Use sanitized_Request
[xvideos] Use sanitized_Request
[yandexmusic] Use sanitized_Request
[youku] Use sanitized_Request
[youporn] Use sanitized_Request
[youtube] Use sanitized_Request
[patreon] Use sanitized_Request
[extractor/common] Remove unused import
[nfb] PEP 8
When using 'bestvideo/best,bestaudio', 'bestvideo/best' must be set as the current_selector (instead of appending it to the selectors), otherwise when it gets the ',' it would append 'None' to the selectors.
'bestvideo+bestaudio/best' was incorrectly interpreted as 'bestvideo+(bestaudio/best)', so it would fail if 'bestaudio' doesn't exist instead of falling back to 'best'.
