update readme

README.md

@@ -23,41 +23,33 @@
 
 ## Architecture
 
+### Overview
+
 ```mermaid
 graph
     Streamers{Streamers} --> Fly
-    Fly[Elixir App - Fly] --> RTMP
-    Fly --> Web[Web Server - Phoenix]
-    Fly --> Db[Postgres - Fly]
-    RTMP[RTMP Server - Membrane] -->|First mile delivery| Tigris[Object Storage - Tigris]
+    Fly[Fly<br>Elixir App] --> RTMP
+    Fly --> Web[Phoenix<br>Web Server]
+    Fly --> Db[Fly<br>Postgres]
+    RTMP[Membrane<br>RTMP Server] -->|First mile delivery| Tigris[Tigris<br>Object Storage]
     Viewers{Viewers} -->|Last mile delivery| Tigris
     Viewers --> Fly
 ```
 
+### Livestream pipeline
+
 ```mermaid
 graph
-    Encoder{Encoder} -->|RTMP packets| Source[RTMP Source]
+    Encoder{Encoder<br>e.g. OBS} -->|RTMP| Source[FLV Demuxer]
     Source -->|video| H264Parser[H264 Parser]
     Source -->|audio| AACParser[AAC Parser]
     H264Parser --> H264Payloader[H264 Payloader]
     AACParser --> AACPayloader[AAC Payloader]
     H264Payloader --> CMAFMuxerVideo[CMAF Muxer]
     AACPayloader --> CMAFMuxerAudio[CMAF Muxer]
-    CMAFMuxerVideo --> HLSSink
-    CMAFMuxerAudio --> HLSSink
-    HLSSink[HLS Sink] --> Tigris{Tigris Object Storage}
-```
-
-```mermaid
-graph
-    App[Application] --> RTMP[RTMP Server]
-    App --> Endpoint[Web Server]
-    App --> Repo[Ecto Repo]
-    App --> Telemetry
-    App --> PubSub
-    App --> Presence
-    App --> DNSCluster[DNS Cluster]
-    App --> FlyRPC[Fly RPC]
+    CMAFMuxerVideo --> fMP4
+    CMAFMuxerAudio --> fMP4
+    fMP4[Fragmented MP4] -->|HLS| Tigris{Tigris Object Storage}
 ```
 
 <!-- GETTING STARTED -->
@@ -73,6 +65,7 @@ Here is what you need to be able to run Algora TV.
 - Elixir (Version: >=1.12)
 - OTP
 - PostgreSQL
+- FFmpeg
 
 ## Development