V S
Slides Primary
 S V
Video Primary
 S
Slides Only
 V
Video Only
Blank
Start Recording
Stop Recording
16:9 F1 F2 F3 F4 F9 Ctrl
+
Enter		 Ctrl
+
Backspace
4:3 F5 F6 F7 F8
Example Usage Slides show important points Presenter is talking or gesturing a lot Slides show small text or code demos Q&A or presenter is talking beyond the slides Rarely used

OBS Basics

  • Start recording before the speaker starts talking
  • Stop recording after the Q&A
  • Perform frequent checks to ensure
    • The speaker microphone is working (either with the headphones or level meters) T1
    • The slides and video are not frozen T2
    • The recording is still ongoing ("REC" timer in the status bar)
  • Look out for all cabling, ensure they are safe and secure
  • Use the correct scene for the correct aspect ratio. Aspect ratio is incorrect when squares or circles look warped

OBS Issues

  • Look out for the "Encoding overloaded!" message in the status bar T3
  • Look out for out of sync audio and video within OBS
    • Usually not a problem, but inform the chat group S1

Standard Procedures

  1. Inform the chat group on every issue encountered, so we can account for all the encountered failure scenarios and improve the setup

Notes

  1. Might need to wait a while for video to reappear or audio to be heard. If it doesn't after 30s, restart OBS
  2. When you need to leave urgently
    • Try to get another volunteer to temporarily replace you
    • Use the "Slides Primary" scene and leave it recording

Troubleshooting

    • Check that the "Microphone" and "Slides Audio" audio sources are not muted or at a low volume
    • Check that all the cables are securely plugged in N1
    • Click on ▸ "Properties" and ensure the correct device is selected N1
      • "Microphone" audio source is either "PCM2902 Audio Codec Analog Stereo" or "Built-in Audio Analog Stereo"
      • "Slides Audio" audio source is "ACASIS"
    • If above fails, switch to emergency audio with the following steps:
      • Unmute "Emergency Audio"
      • Mute "Microphone" and "Slides Audio"
      • Once the talk ends, fix the problems
    • If above fails, restart OBS
    • Check that all the cables are securely plugged in N1
    • Right-click on the source ("Slides" or "Camera") ▸ "Properties" and ensure the correct device is selected N1
      • "Slides" source is "ACASIS"
      • "Camera" source is either "HD Pro Webcam C920" or "ACASIS"
    • If above fails, restart OBS
    • Ensure the laptop cooling airflow is not impeded
    • Close all other programs
    • If above fails, inform the chat group S1
    • Ensure the next recording uses the 720p profile ("Profile" option in the menu bar)
    • If the video blacks out or crashes, restart OBS