v4_EN_ClientSDK

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The workflow of live streaming:

+---------+      +-----------------+       +---------+
| Encoder +-->---+ SRS/CDN Network +--->---+ Player  |
+---------+      +-----------------+       +---------+

The architecture of Encoder(publish/push stream) and Player(play/pull stream):

+-------------------------------------------+
|           Device(Out/In YUV/PCM)          |
+-------------------------------------------+
|   Codec(YUV/PCM to/from H.264/AAC stream) |
+-------------------------------------------+
|   Muxer(H.264/AAC to/from FLV/MP4/HLS)    |
+-------------------------------------------+
|          Transport(RTMP/HTTP/UDP)         |
+-------------------------------------------+

There are two different types of codec, one is hardware encoder, and the other is software encoder. Hardware encoder is inside the mobile device; while software encoder is FFMPEG/libx264. The performance of hardware encoder is high; while there are more available parameters expored in software encoder.

YASEA

YASEA is advanced SRS-SEA. YASEA can be used in product, while SRS-SEA is only experimental.

The basic features of encoder:

Android	iOS	Codec	Transport	Hardware Encoder	Software Encoder	Lowlatency
YES	NO	H.264+AAC	RTMP/FLV	YES	YES	NO

The advanced features of encoder:

美颜	横竖屏	摄像头 切换	对焦	动态码率	水印	贴纸
YES	NO	NO	NO	NO	NO	NO

Other features of encoder:

• 回声抑制。

Requirement: Android SDK level 16+, Android 4.1, the JELLY_BEAN

All SDKs are listed bellow:

• Android Encoder: YASEA

EXOPlayer

The EXOPlayer is a Android player which support HTTP-FLV and HLS.

The basic features of player:

Android	iOS	Codec	Transport	Lowlatency
YES	NO	H.264+AAC	FLV/HLS	YES

Using encoder YASEA and player EXOPlayer, we can make a Android solution for live streaming around 3s latency.

LFLiveKit

LFLiveKit is a encoder for iOS from LaiFeng.

Remark: The lf.swift project is a iOS library, but seems not popular as LFLiveKit.

IJKPlayer

ijkplayer is a player from bilibili, for both Android and iOS.

LIBRTMP

The LIBRTMP or SRS-LIBRTMP only provides transport over RTMP.

PC

Although the number of PC users are smaller, there are still some use scenarios for OBS or OBS Studio.

Remark: For publishing by OBS, the Stream Key should be filled by stream name.

The players for PC platform, either Flash(RTMP, FLV, HLS) or MSE(H5, DASH, videojs, FLV).

Winlin 2017.4