[Objective-C] 初試一下 youtube live streaming (二) 實作步驟

找到幾篇有關於直播的教學，但都2014了，還是可以參考一下。
以下簡述使用Youtube直播步驟。

http://yhsiang.logdown.com/posts/2014/04/16/stream-to-youtube-with-live-streaming-api

https://youtube-eng.googleblog.com/2014/10/watchme-live-stream.html

http://justinyang1221.blogspot.tw/2014/10/live-stream-youtubestreaming-to-youtube.html

將即時串流推送到串流伺服器 (推流)
https://github.com/jgh-/VideoCore
https://github.com/LaiFengiOS/LFLiveKit => 最好操作整合，很多人拿來二次開發
https://github.com/pili-engineering/PLMediaStreamingKit

顯示即時串流 (拉流)
https://github.com/Bilibili/ijkplayer

完整流程

以下是最後實作完驗證過的流程，這篇也講的很清楚。
http://octuplus.co/Detalles/2084/Cannot-make-transition-of-my-Youtube-broadcast-to-live-using-Youtube-API

So a bit unclear rule is:

1. ensure you have broadcast and livestream created and ready.
   and ensure that broadcast lifecycle status is not COMPLETE, otherwise recreate broadcast ... so ensure that your broadcast lifecycle status is ready
2. bind broadcast to livestream
3. start publishing video to livestream
4. wait for livestream status active
5. transition to testing (yes, you have to do it instead of moving to live)
6. wait for broadcast lifeCycleStatus to become testing
7. transition to live
8. wait for broadcast lifeCycleStatus to become live

You cannot skip testing and cannot transition from complete to testing or ready.