Add arte.tv to InfoExtractors

[alab1001101]

arte.tv is a french/german television channel with live stream and possibility to watch selected broadcasts up to 7 days after broadcasting.

[phihag]

Merged, thanks!

[screen12345]

They seem to have changed their URL format. The extractor fails with:

youtube-dl.exe" --write-description --console-title --title --restrict-filenames --playlist-end 10 --no-part --format 44/18/5 http://www.arte.tv/guide/de/039614-000/last-cowboy-standing
WARNING: Falling back on generic information extractor.
[generic] last-cowboy-standing?autoplay=1: Downloading webpage
[generic] last-cowboy-standing?autoplay=1: Extracting information
ERROR: Invalid URL: http://www.arte.tv/guide/de/039614-000/last-cowboy-standing

URL I tested it with: http://www.arte.tv/guide/de/039614-000/last-cowboy-standing (valid until next Tuesday I guess, but other videos are available at http://www.arte.tv/guide/de/plus7 (German) or http://www.arte.tv/guide/fr/plus7 (French).

Suggesting to change the _VALID_URL regex from (?:http://)?videos\.arte\.tv/(?:fr|de)/videos/.*' to (?:http://)?www\.arte.tv/guide/(?:fr|de)/[0-9-](?:/.*)?. No idea how to change the _LIVE_URL, though.

[jaimeMF]

@screen12345 Can you submit a pull request?

[screen12345]

I'm sorry, but I can't because I haven't got the dev environment set-up...

[jaimeMF]

@screen12345 I have open and issue: #875, if you have more info comment there please.