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195
README.md
195
README.md
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@ -180,7 +180,7 @@ For external services to work with SRS:
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## Chnagelogs
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## Chnagelogs
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Please read [CHANGELOG](CHANGELOG).
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Please read [CHANGELOG](CHANGELOG.md#chnagelog).
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## Releases
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## Releases
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@ -240,104 +240,8 @@ Please read [CHANGELOG](CHANGELOG).
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## Compare
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## Compare
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Comparing with other media servers, SRS is much better and stronger, for details please read Product([CN][v4_CN_Compare]/[EN][v4_EN_Compare]).
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Comparing with other media servers, SRS is much better and stronger, for details please
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read Product([CN][v4_CN_Compare]/[EN][v4_EN_Compare]).
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<a name="stream-delivery"></a>
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**Stream Delivery**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| RTMP | Stable | Stable | Stable | Stable | Stable |
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| HLS | Stable | Stable | X | Stable | Stable |
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| HTTP FLV | Stable | X | X | X | X |
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| HLS(aonly) | Stable | X | X | Stable | Stable |
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| HDS | Experiment| X | X | Stable | Stable |
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| MPEG-DASH | Experiment| X | X | X | X |
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| SRT | Experiment| X | X | X | Stable |
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| HTTP Server | Stable | Stable | X | X | Stable |
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<a name="cluster"></a>
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**Cluster**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| RTMP Edge | Stable | X | X | Stable | X |
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| RTMP Backup | Stable | X | X | X | X |
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| VHOST | Stable | X | X | Stable | Stable |
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| Reload | Stable | X | X | X | X |
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| Forward | Stable | X | X | X | X |
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| ATC | Stable | X | X | X | X |
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| Docker | Stable | X | X | X | X |
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<a name="stream-service"></a>
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**Stream Service**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| DVR | Stable | Stable | X | X | Stable |
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| DVR API | Stable | Stable | X | X | X |
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| DVR MP4 | Stable | X | X | X | X |
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| EXEC | Stable | Stable | X | X | X |
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| Transcode | Stable | X | X | X | Stable |
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| HTTP API | Stable | Stable | X | X | Stable |
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| HTTP RAW API | Stable | X | X | X | X |
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| HTTP hooks | Stable | X | X | X | X |
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| GopCache | Stable | X | X | Stable | X |
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| Security | Stable | Stable | X | X | Stable |
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| Token Traverse| Stable | X | X | Stable | X |
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<a name="efficiency"></a>
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**Efficiency**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| Concurrency | 7.5k | 3k | 2k | 2k | 3k |
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|MultipleProcess| [Stable][v4_CN_ReusePort] | Stable | X | X | X |
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| RTMP Latency| 0.1s | 3s | 3s | 3s | 3s |
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| HLS Latency | 10s | 30s | X | 30s | 30s |
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<a name="stream-caster"></a>
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**Stream Caster**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| Ingest | Stable | X | X | X | X |
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| Push MPEGTS | Experiment| X | X | X | Stable |
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| Push RTSP | Experiment| X | Stable | X | Stable |
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| Push HTTP FLV | Experiment| X | X | X | X |
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<a name="debug-system"></a>
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**Debug System**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| BW check | Stable | X | X | X | X |
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| Tracable Log | Stable | X | X | X | X |
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<a name="docs"></a>
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**Docs**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| Demos | Stable | X | X | X | X |
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| WIKI(EN+CN) | Stable | EN only | X | X | Stable |
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<a name="others"></a>
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**Others**
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| Feature | SRS | NGINX | CRTMPD | AMS | WOWZA |
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| ----------- | ------- | ----- | --------- | -------- | ------ |
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| ARM/MIPS | Stable | Stable | X | X | X |
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| Client Library| Stable | X | X | X | X |
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Remark:
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1. Concurrency: We only benchmark the concurrency of single process.
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1. MultipleProcess: SRS supports multiple processes by [go-oryx][oryx].
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1. HLS aonly: HLS supports audio only mode without video stream.
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1. BW check: The bandwidth check feature is used to detect the bandwidth between server and client.
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1. Security: The security includes access control, token authentication and referer check.
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1. Reload: SRS and Nginx supports reload, but nginx-rtmp doesn't.
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## Performance
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## Performance
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@ -457,99 +361,30 @@ We used FMLE as encoder for benchmark. The latency of server was 0.1s+,
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and the bottleneck was the encoder. For more information, read
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and the bottleneck was the encoder. For more information, read
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[bug #257][bug #257-c0].
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[bug #257][bug #257-c0].
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<a name="hls-overhead"></a>
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**HLS overhead**
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About the overhead of HLS overhead, we compared FFMPEG and SRS.
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| Bitrate | Duration | FLV(KB) | HLS(KB) | Overhead |
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| ------- | -------- | ------- | -------- | --------- |
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| 275kbps | 600s | 11144 | 12756 | 14.46% |
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| 260kbps | 1860s | 59344 | 68004 | 14.59% |
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| 697kbps | 60s | 5116 | 5476 | 7.03% |
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| 565kbps | 453s | 31316 | 33544 | 7.11% |
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| 565kbps | 1813s | 125224 | 134140 | 7.12% |
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| 861kbps | 497s | 52316 | 54924 | 4.98% |
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| 857kbps | 1862s | 195008 | 204768 | 5.00% |
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| 1301kbps | 505s | 80320 | 83676 | 4.17% |
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| 1312kbps | 1915s | 306920 | 319680 | 4.15% |
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| 2707kbps | 600s | 198356 | 204560 | 3.12% |
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| 2814kbps | 1800s | 618456 | 637660 | 3.10% |
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| 2828kbps | 60s | 20716 | 21356 | 3.08% |
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| 2599kbps | 307s | 97580 | 100672 | 3.16% |
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| 2640kbps | 1283s | 413880 | 426912 | 3.14% |
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| 5254kbps | 71s | 45832 | 47056 | 2.67% |
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| 5147kbps | 370s | 195040 | 200280 | 2.68% |
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| 5158kbps | 1327s | 835664 | 858092 | 2.68% |
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The HLS overhead is calc by: (HLS - FLV) / FLV * 100%.
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The overhead should be larger than this benchmark(48kbps audio is best overhead), for we fix the [#512][bug #512].
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## Architecture
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## Architecture
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SRS always use the simplest architecture to solve complex domain problems.
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The stream architecture of SRS.
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* System arch: the system structure and arch.
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* Modularity arch: the main modularity of SRS.
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* Stream arch: the stream dispatch arch of SRS.
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## System Architecture
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```
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```
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+------------------------------------------------------+
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+----------+ +----------+
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| Application |
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| Upstream | | Deliver |
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| Origin/Edge/HTTP-FLV/StreamCaster |
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+---|------+ +----|-----+
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+---------------+---------------+-----------+----------+
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+---+------------------+------+---------------------+----------------+
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| RAW API/ | EXEC/ | DVR/HLS | FLV/TS/ |
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| API/hook | Transcoder | HDS/DASH | AMF0/JSON|
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+---------------+---------------+-----------+ RTMP/RTSP|
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| http-parser | FFMPEG/x264 | NGINX/ts | protocol |
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+---------------+---------------+-----------+----------+
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| Network(state-threads) |
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+------------------------------------------------------+
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| All Linux/Unix(RHEL,CentOS,Ubuntu,Fedora...) |
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+------------------------------------------------------+
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```
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## Modularity Architecture
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```
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+--------------------+---------------------------------+
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| SRS/SRT server | Programs in Main |
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+--------------------+-------+-------------------------+
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| App(For SRS) | Modules(1) |
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+----------------------------+-------------------------+
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| Protocol Stack(RTMP/HTTP/RTSP/JSON/AMF/Service) |
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+------------------------------------------------------+
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| Kernel(File, Codec, Stream, LB services) |
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+------------------------------------------------------+
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| Core(Macros and very low-level APIs) |
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+------------------------------------------------------+
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```
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Remark:
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1. Modules: SRS supports code-level modularity, read [modules][modules].
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## Stream Architecture
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```
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+---------+ +----------+
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| Publish | | Deliver |
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+---|-----+ +----|-----+
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+----------------------+----------------------------+----------------+
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| Input | SRS(Simple RTMP Server) | Output |
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| Input | SRS(Simple RTMP Server) | Output |
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+----------------------+----------------------------+----------------+
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+----------------------+----------------------------+----------------+
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| | +-> DASH ----------------+-> DASH player |
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| | +-> DASH ----------------+-> DASH player |
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| Encoder(1) | +-> RTMP/HDS -----------+-> Flash player |
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| Encoder(1) | +-> RTMP/HDS -----------+-> Flash player |
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| (FMLE,FFMPEG, -rtmp-+->-+-> HLS/HTTP ------------+-> M3U8 player |
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| (FMLE,OBS, --RTMP-+->-+-> HLS/HTTP ------------+-> M3U8 player |
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| Flash,XSPLIT, | +-> FLV/MP3/Aac/Ts ------+-> HTTP player |
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| FFmpeg,XSPLIT, | +-> FLV/MP3/Aac/Ts ------+-> HTTP player |
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| ......) | +-> Fowarder ------------+-> RTMP server |
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| ......) | +-> Fowarder ------------+-> RTMP server |
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| | +-> Transcoder ----------+-> RTMP server |
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| | +-> Transcoder ----------+-> RTMP server |
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| | +-> EXEC(5) -------------+-> External app |
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| | +-> EXEC(5) -------------+-> External app |
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| | +-> DVR -----------------+-> FLV file |
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| | +-> DVR -----------------+-> FLV file |
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| | +-> BandwidthTest -------+-> Flash |
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| | +-> BandwidthTest -------+-> Flash |
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| | +-> WebRTC --------------+-> Flash |
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+----------------------+ | |
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| WebRTC Client | +--> RTMP | |
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| (H5,Native...) --RTC-+---+---> WebRTC ------------+-> WebRTC Client|
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+----------------------+ | |
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+----------------------+ | |
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| MediaSource(2) | | |
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| MediaSource(2) | | |
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| (RTSP,FILE, | | |
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| (RTSP,FILE, | | |
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@ -591,6 +426,8 @@ Maintainers of SRS project:
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* [John](https://github.com/xiaozhihong): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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* [John](https://github.com/xiaozhihong): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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* [B.P.Y(Bepartofyou)](https://github.com/Bepartofyou): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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* [B.P.Y(Bepartofyou)](https://github.com/Bepartofyou): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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* [Lixin](https://github.com/xialixin): Focus on [GB28181](https://github.com/ossrs/srs/issues/1500) module.
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* [Lixin](https://github.com/xialixin): Focus on [GB28181](https://github.com/ossrs/srs/issues/1500) module.
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* [Mozhan](https://github.com/lipeng19811218): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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* [Jinxue](https://github.com/chen-guanghua): Focus on [WebRTC](https://github.com/simple-rtmp-server/srs/wiki/v4_CN_WebRTC) module.
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A big THANK YOU goes to:
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A big THANK YOU goes to:
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