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Recording.md

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How to record material for virtual presentations

Please report any issues with these instructions here on github.

General instructions

  1. Upload your video recording to YouTube (preferably) or any other web storage with reasonable uplink
    • Be sure your video title contains following information: Talk name - 1st Speaker name - 2nd speaker name. Please, use mp4 video format.
  2. We advise you to use a external microphone (not your laptop's microphone). The audio quality is usually better when using external one.
  3. Once you have uploaded your video, go to 'Accepted proposals' on the CfP site to submit the link to your recorded video.
  4. If you experience any issues, send us email at [email protected] and we will work with you to figure out alternate options.

Using OBS Studio to Record Video

  1. Download the installer for your system and install OBS Studio: OBS Installation Instructions
  2. Open OBS Studio and run through the AutoConfig Wizard
    1. Select Optimize for recording as the focus is on recording our screen.
    2. Select 1920x1080 for the Base Resolution, and 30 for the FPS. Resolution Settings.
    3. Once it is done testing, click on Apply Settings.
  3. Next, we will be configuring the OSB settings. Start by click on Settings
    1. Click on Output
      • Select an output path.
      • Select mp4 as the Recording Format
      • Select x264 for the Encoder
      • The bitrate is a fine balance between video size and quality. Generally the default of 2500 Kbps is enough for most demos. If your recording requires a higher resolution/framerate the Youtube's Recommended upload encoding settings provide a good guide. Output Settings
    2. Click on Audio
      • Select your microphone under the Mic/Auxiliary Audio setting
    3. Click on Video
      • Set the Base resolution to 1920x1080
      • Set the Output resolution to 1920x1080
      • Set the FPS to 30
    4. Note: You can also setup hotkeys via the Hotkeys tab to start/stop recordings if you find using the keyboard simpler.
  4. Scene and Source Setup
    1. Add the Screen Capture Source by clicking the + in the Sources box
    2. Pick the screen you are looking to capture (if you have additional monitors)
      • Right click on the live screen capture with OBS and choose Transform -> Center. Then, right click on the capture and choose Transform -> Fit to Screen
      • Note: Wayland users may run into an issue with OBS showing a black screen. Switching to Xorg is a quick fix for the issue.
  5. Alternative to using a standalone camera
    1. Add your webcam to the corner if you want.
      • To do so, you can just click on the + and adding a video capture device. Resize as desired.
    2. OBS Studio makes it easy to switch between scenes. If you would like to record a different ‘thing’ for your recording you might want to add scenes and flip through them while recording live.

Alternatives

If the OBS studio does not work for you (e.g. because you're running on Wayland), there are some alternatives.

Using wf-recorder (for Wayland)

  1. Install wf-recorder using your package manager.
    1. For Fedora Linux, and similar
      • You need to enable rpmfusion-free first.
      • Afterwards, install it using: $ dnf install wf-recorder.
    2. For other, see installation instructions on the project page.
  2. Set the microphone
    1. Either in your system setings, set the default microphone to the desired one.
    2. Alternatively, on Fedora and similar, you can use Pulse Audio Volume Control to setup your microphone.
      • To install: $ dnf install pavucontrol
      • To run: $ nohup pavucontrol &
      • Ensure your device is available and working in the Input Devices tab.
      • For troubleshooting: you can switch your device to appropriate mode in Configuration tab.
      • After starting the recording you can set the input on the Recording tab.
  3. Start the recording.
    1. Run a terminal in a directory you want to save the video in.
    2. Type into the terminal, and confirm the following command to start the recording of both your screen and audio (microphone+from computer). wf-recorder -a -f "my-talk.mp4"
      • If you have multiple monitors, please select the one you want to record. Type the number and enter to confirm.
      • If you want the recording to end on its own after 20 minutes, you can prefix the command with timeout -s INT 1200 wf-recorder ...
      • If you want to start the recording after 5 seconds, you can prefix the above command with sleep 5 ; wf-recorder ...
      • E.g. the combination of the above would look like: sleep 5 ; timeout -s INT 1200 wf-recorder -a -f "my-talk.mp4"
  4. End the recording by pressing CTRL+C in the terminal.

Using QuickTime Player (for macOS)

  1. Download instructions.
  2. For recording, follow these Instructions.
    • You need to allow microphone in System preferences.
    • Select correct microphone (please check its output).
    • Please select whole screen for recording (to preserve width/height ratio)

Using external video camera and screen recording

  1. Additionally to screen recording, you can use an external camera and microphone (even from a phone), and we'll put them together.
    • In such case, make sure you record audio (voice) in each recording, so we can match them properly.
    • We'll put the two recordings into a common template (example).
  2. We can also make some video/audio adjustments for you if necessary (raise audio volume, wide angle cropping, start-end trimming).
    • If you have any wishes, please mention them in CfP portal form.

Recording audio separately

Prefered way is for audio to be recorded both together, but it's possible to send your audio track separately (or mix it yourself). You can use this guide for that.