DOCS and defaults: youtube-dl default format is now bestvideo+bestaudio/best

[yan12125]

References:
[1] #1321
[2] ytdl-org/youtube-dl#5447
[3] ytdl-org/youtube-dl@feccf29

Issue #1321 proposed to use bestvideo+bestaudio as the default format in invoking youtube-dl. Now youtube-dl's default format is bestvideo+bestaudio/best due to the proposal in [2]. As a result, either https://github.com/mpv-player/mpv/blob/master/DOCS/man/options.rst should be updated to conform to the latest changes in youtube-dl, or https://github.com/mpv-player/mpv/blob/master/player/lua/ytdl_hook.lua should enforce best format when passsing arguments.

Note that such changes are not included in the latest stable release 2015.04.17 yet, but it won't be long due to youtube-dl's rapid release schedule.

[ghost]

OK, the default is now actually "best", instead of letting youtube-dl decide.

[rrooij]

This breaks:

d453600

It's because the format option takes precedence over the -x option, when downloading a YouTube video.

[jaimeMF]

In that case, you could use -f bestaudio/best instead.

[rrooij]

@jaimeMF
Thanks for the suggestion.

I think that my commit should be reverted then, since people that don't want to waste bandwidth can use that format option instead of letting mpv pass the -x argument.