[enhancement] Add streamlink as a alternative to youtube-dl

[jiahaoliang]

streamlink is similar to youtube-dl in many different ways.

Although the video sources they supported are mostly the same, there are still some plugins available in streamlink that is missing in youtube-dl (live stream from douyu.com or 1080p from youtube for example). Also it's always a good thing to add a duplicate extractor in case youtube-dl is broken in any way.

On Raspberry Pi, I can simply pipe streamlink and omxplayer to make it work
# streamlink -p "omxplayer --timeout 20" https://www.youtube.com/watch?v=QMDf5MSE0LQ best

[console][info] Found matching plugin youtube for URL https://www.youtube.com/watch?v=QMDf5MSE0LQ
[console][info] Available streams: audio_mp4, audio_webm, 144p (worst), 180p, 360p, 720p, 1080p (best)
[console][info] Opening stream: 1080p (muxed-stream)
[console][info] Creating pipe streamlinkpipe-23988
[console][info] Starting player: omxplayer --timeout 20
....(omxplayer plays it as expected)

Interested in exploring how to add streamlink as a secondary extractor as well as a general framework to integrate other extractors in the future.

Hints and guidelines are always appreciated.

[mheine]

Looks interesting! I've have some trouble with stuttering playback from livestreams on twitch.tv, so this might be another option. My suggestion would be to add a configuration option that sets the extractor to streamlink (but where the default would still be youtube-dl)

[jarondl]

Seems like @vincelwt started something in the past (in c4f76b9 livestreamer is the predecessor of streamlink).

This seems like a great idea, but I would try to use their Python API instead of calling the cli.