chore: add metrics with posthog

README.md

@@ -84,6 +84,20 @@ export default makeScene2D(function* (view) {
 
 https://github.com/havenhq/revideo/assets/122226645/4d4e56ba-5143-4e4b-9acf-d8a04330d162
 
+## Telemetry
+
+To understand how people use Revideo, we **anonymously** track how many videos
+are rendered using the open-source tool
+[Posthog](https://github.com/PostHog/posthog). You can find our code
+implementing Posthog
+[here](https://github.com/redotvideo/revideo/tree/main/packages/ffmpeg/server/telemetry).
+
+If you want to disable telemetry, just set the following environent variable:
+
+```bash
+DISABLE_TELEMETRY=true
+```
+
 ## Learn More
 
 To learn more about Revideo, feel free to check out our

packages/ffmpeg/package.json

@@ -30,6 +30,7 @@
     "@revideo/core": "^0.2.0",
     "@revideo/vite-plugin": "^0.2.0",
     "fluent-ffmpeg": "^2.1.2",
+    "posthog-node": "^4.0.0",
     "uuid": "^9.0.1",
     "vite": "^4.5"
   }

packages/ffmpeg/server/FFmpegExporterServer.ts

@@ -13,6 +13,7 @@ import * as os from 'os';
 import * as path from 'path';
 import {v4 as uuidv4} from 'uuid';
 import {ImageStream} from './ImageStream';
+import {EventName, sendEvent} from './telemetry/posthog';
 
 const SAMPLE_RATE = 48000;
 
@@ -91,6 +92,7 @@ export class FFmpegExporterServer {
   }
 
   public async start() {
+    sendEvent(EventName.RenderStarted, {});
     if (!fs.existsSync(this.config.output)) {
       await fs.promises.mkdir(this.config.output, {recursive: true});
     }

packages/ffmpeg/server/telemetry/posthog.ts

@@ -0,0 +1,25 @@
+import {PostHog} from 'posthog-node';
+
+const Client = new PostHog('phc_YpKoFD7smPe4SXRtVyMW766uP9AjUwnuRJ8hh2EJcVv', {
+  host: 'https://eu.posthog.com',
+});
+
+export enum EventName {
+  RenderStarted = 'render-started',
+}
+
+export function sendEvent(eventName: EventName, eventProperties: object = {}) {
+  if (process.env.DISABLE_TELEMETRY === 'true') {
+    return;
+  }
+
+  try {
+    Client.capture({
+      distinctId: 'anonymous-user',
+      event: eventName,
+      properties: eventProperties,
+    });
+  } catch (e) {
+    console.error(e);
+  }
+}