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+# Owncast Backend Architecture
+
+Work in progress documentation detailing the backend architecture of Owncast.
+
+## Structure
+
+WIP
+
+## Diagram
+
+```mermaid
+%% Owncast backend architecture.
+%% See https://jojozhuang.github.io/tutorial/mermaid-cheat-sheet/
+%% for a cheat sheet on creating this diagram.
+%% Paste this document in https://mermaid.live as a quick way to edit.
+
+%% This is a graph style diagram, Top Down.
+graph TD
+
+
+%% Define Nodes and Subgraphs
+
+subgraph VideoPipeline[Video Pipeline]
+    VideoTranscoder(fa:fa-video Video Transcoder)
+    RTMPService[fa:fa-video RTMP Service]
+    FFMpeg[fa:fa-video ffmpeg]
+end
+
+subgraph ChatService[fa:fa-comment Chat Service]
+end
+
+subgraph Dependencies
+    subgraph Webhooks[fa:fa-webhook Webhooks]
+        InboundWebhooks[Inbound]
+        OutboundWebhooks[Outbound]
+    end
+
+    App{Application}
+    ChatService--->App
+    Webhooks--->App
+    ConfigRepository(fa:fa-hard-drive Config Repository)--->App
+    UserRepository(fa:fa-hard-drive User Repository)--->App
+    Database(fa:fa-hard-drive Database)--->ConfigRepository
+    Database--->UserRepository
+    ApplicationState(fa:fa-list Application State)--->App
+    GeoIP(fa:fa-globe GeoIP Lookup)--->App
+    Statistics(fa:fa-list Statistics)--->App
+end
+
+subgraph VideoStorageProviders[Video Storage Providers]
+    LocalStorage((fa:fa-hard-drive Local Storage))
+    S3Storage((fa:fa-hard-drive S3 Storage))
+end
+
+subgraph ActivityPub
+    ActivityPubInboundHandlers[fa:fa-hashtag Inbound]
+    ActivityPubOutboundHandlers[fa:fa-hashtag Outbound]
+end
+
+subgraph Authentication
+    IndieAuth[fa:fa-key IndieAuth]
+    FediAuth[fa:fa-key FediAuth]
+end
+
+subgraph Notifications
+    DiscordNotifier[fa:fa-comment Discord]
+    BrowserNotifier[fa:fa-browser Browser]
+end
+
+subgraph WebServer[Web Server]
+    ActivityPubHandlers[fa:fa-file ActivityPub Handlers]
+    StaticFiles((fa:fa-file Static Files))
+    WebSocket[WebSocket]
+
+    subgraph WebAssets[Web Assets]
+        EmbeddedStaticFiles((fa:fa-file Embedded\nStatic Assets))
+        OnDiskStaticFiles((fa:fa-file On Disk\nStatic Assets))
+        WebApplication[fa:fa-file  Web\nApplication]
+        PublicFiles[fa:fa-file Public\nDirectory]
+    end
+
+    subgraph HTTPHandlers[fa:fa-browser HTTP Handlers]
+        subgraph AdminAPIs[Admin APIs]
+        end
+        subgraph ChatAPIs[Chat APIs]
+            ChatUserRegistration[Chat User Registration]
+            Emoji[Emojis]
+            subgraph ChatAuthAPIs[Chat Authentication]
+                FediAuth
+                IndieAuth
+            end
+        end
+        subgraph VideoAPIs[fa:fa-video Video APIs]
+            ViewerPing[Viewer Ping]
+            PlaybackMetrics[Playback health metrics]
+        end
+        ActivityPubHandlers
+        ApplicationConfig[Application Config]
+        ApplicationStatus[Application Status]
+        Directory[Directory API]
+        Followers[Followers]
+    end
+end
+
+subgraph Streamer
+    BroadcastingSoftware>fa:fa-video BroadcastingSoftware]
+end
+
+subgraph Viewer
+    VideoPlayer[fa:fa-video Video Player]
+    WebBrowser[fa:fa-browser Web Browser]
+end
+
+
+
+%% All the services and packages require access
+%% to dependencies through a Application reference.
+App-.->HTTPHandlers
+App-.->RTMPService
+App-.->ActivityPub
+App-.->Authentication
+App-.Stream went\nonline.->Notifications
+App-.->DirectoryNotifier[Directory Notifier]
+
+LocalStorage--HLS-->OnDiskStaticFiles
+
+RTMPService>RTMP Ingest]--RTMP-->VideoTranscoder
+VideoTranscoder--HLS-->VideoStorageProviders
+VideoTranscoder--RTMP-->FFMpeg
+FFMpeg--HLS-->VideoTranscoder
+
+%% Viewers
+VideoPlayer-->VideoStorageProviders
+WebBrowser-->WebAssets
+
+%% Streamers
+BroadcastingSoftware--RTMP-->RTMPService
+
+%% Style the nodes
+
+%% Define reusable styles for node types
+classDef bigtext font-weight:bold,font-size:20px
+classDef repository fill:#4F625B,color:#fff
+classDef webservice fill:#6082B6,color:#fff
+classDef rtmp fill:#608200, color:#fff
+classDef inbound fill:#6544e9,stoke:#fff,color:#fff
+classDef outboundservice fill:#2386e2,stroke:green,color:#fff
+classDef storage fill:#42bea6,color:#fff
+
+%% Assign styles to nodes
+class App bigtext
+class UserRepository repository
+class ConfigRepository repository
+
+class WebSocket inbound
+class HTTPHandlers inbound
+class ActivityPubInboundHandlers inbound
+class InboundWebhooks inbound
+
+class ActivityPubOutboundHandlers outboundservice
+class DiscordNotifier outboundservice
+class BrowserNotifier outboundservice
+class OutboundWebhooks outboundservice
+class DirectoryNotifier outboundservice
+
+class BroadcastingSoftware rtmp
+class RTMPService rtmp
+
+class Database storage
+class LocalStorage storage
+class S3Storage storage
+
+%% Customize the theme styles
+%%{init: {'theme':'base', 'themeVariables': {'darkMode': true, 'lineColor': '#c3dafe', 'tertiaryTextColor': 'white', 'clusterBkg': '#2d3748', 'primaryTextColor': '#39373d', "edgeLabelBackground": "white", "fontFamily": "monospace"}}}%%
+```