Note: Pop!_OS has a heavily customized GNOME Shell, your mileage may vary.
sudo apt update && sudo apt upgrade
sudo apt install -y ubuntu-restricted-extras
Reference: https://support.system76.com/articles/codecs/
# Build time dependencies (Git, Meson)
sudo apt install git meson
# GTK4 media backend
sudo apt install libgtk-4-media-gstreamer
# GstPlay and GstAudio
sudo apt install gir1.2-gst-plugins-base-1.0 gir1.2-gst-plugins-bad-1.0
# Build dependencies
sudo apt install libgstreamer1.0-dev libgstreamer-plugins-base1.0-dev libgstreamer-plugins-good1.0-dev libgstreamer-plugins-bad1.0-dev libgtk-4-dev
# Build & install
git clone https://github.com/Rafostar/clapper.git
cd clapper
meson builddir --prefix=/usr/local
sudo meson install -C builddir
Reference: https://github.com/Rafostar/clapper
Refer to the README