Implement --hls-prefer-livestreamer

[Kagami]

• I've verified and I assure that I'm running youtube-dl 2016.04.24
• At least skimmed through README and most notably FAQ and BUGS sections
• Searched the bugtracker for similar issues including closed ones

What is the purpose of your issue?

• Bug report (encountered problems with youtube-dl)
• Site support request (request for adding support for a new site)
• Feature request (request for a new functionality)
• Question
• Other

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Description of your issue, suggested solution and other information

FFmpeg seems to be very ineffecient on HLS streams, especially on a slow ones. For example, it drops a lot of segments on vlive.tv streams with middle/high quality (low-res streams are recorded fine). On the other hand livestreamer "hls://stream-url.m3u8" best -o out.ts works perfectly fine. So I think it would be great to have support for external livestreamer downloader. Note that HlsFD currently can't handle live streams.

(This is just a propose, I currently don't have any code for this.)

[yan12125]

Does livestreamer support other protocols? For example direct HTTP(S), DASH, MMS/RTSP, and RTMP?

[Kagami]

Yes, there are few more. Though RTMP seems to be handled via rtmpdump just like in youtube-dl.

[spookyahell]

I also think it would be great to be able to combine youtube-dl and livestreamer. For some videos I have to do it manually at this point, because ffmpeg will interrupt the download (even with "-timout" doesn't work good) and livestreamer will retry fetching and notify when it had trouble fetching a segment.

But: If at all, livestreamer would have to be implemented as a exterenal downloader and not just for the hls protocol.

[Kagami]

livestreamer is de facto dead, but there is streamlink fork with same functionality.