fix(screencast): bump chromium video quality (#4146)

Author: pavelfeldman

src/server/chromium/videoRecorder.ts

@@ -53,7 +53,7 @@ export class VideoRecorder {
     assert(!this._isRunning());
     const w = options.width;
     const h = options.height;
-    const args = `-loglevel error -f image2pipe -c:v mjpeg -i - -y -an -r ${fps} -c:v vp8 -qmin 0 -qmax 50 -crf 8 -vf pad=${w}:${h}:0:0:gray,crop=${w}:${h}:0:0`.split(' ');
+    const args = `-loglevel error -f image2pipe -c:v mjpeg -i - -y -an -r ${fps} -c:v vp8 -qmin 0 -qmax 50 -crf 8 -b:v 1M -vf pad=${w}:${h}:0:0:gray,crop=${w}:${h}:0:0`.split(' ');
     args.push(options.outputFile);
     const progress = this._progress;