This repository contains some scripts to aid in recording a presentation and then combining the results into a single video of the slides and speaker.

The aim is to record the desktop, to capture the presentation in high-fidelity, and to also video the presenter/speaker with a camera. The two videos can then be combined into one, with a template used for the background.

Recording a linux desktop is pretty simple if you’re using x11, but since moving to wayland, most existing tools will just capture a black screen. Instead, you need to either hook into the gnome dbus screen recording mechanism (using something like green-recorder), or better still capture from the drm kms video device directly.

ffmpeg has support for kms capture, so that that’s what I’ve used. The trickiest part is telling it which screen to record if you have a multi monitor setup.

./wayland-capture.sh <output_filename> will invoke the script, first prompting you to select the monitor to record

It uses VAAPI for hardware accelleration (realitically limiting it to intel graphics cards), so it shouldn’t slow your machine down much while presenting.

Use an ordinary video camera to capture the presenter/speaker while they give the presentation, then transfer the recording to your computer.

TODO: Implement a script to capture the presenter via a webcam

Prior to this step, you’ll want to edit your video files so that they start and end at the same point.

You’ll need to prepare a template image file (1920x1080, jpg or png) that will be the base of your final video. You can use this to display the title of the presentation and company logo etc.

./combine.sh --template <templatefile> --speaker <speaker_video> --presentation <presentation_video> <output_filename>

This command will stack your videos on top of the template image, so that the presentation video is scaled to 1280x720 and placed in the top left (x=30, y=30), and the speaker video is scaled to 566x318 and placed in the top right (x=1335, y=30).

TODO: Make the position and size of the video configurable. TODO: Hardware accellerate this step.