GammaRec

GammaRec is a video capture recording and preview utility. The main use case is recording a feed from a capture device while compositing the source into a stream layout using window capture or streaming software such as OBS.

Install

GammaRec is written in Python and relies heavily on Gtk and Gstreamer. You may need to install some prerequisites depending on your distribution:

$ sudo apt-get install \
    gstreamer1.0-libav \
    gstreamer1.0-plugins-ugly \
    gstreamer1.0-gtk3 \
    python3 \
    python3-pip
$ pip3 install gammarec

To run GammaRec, just launch the desktop entry, or run from command line:

$ gammarec

Wayland

GammaRec supports native Wayland rendering via its fallback element, gtksink, however, performance takes a hit and you will not be able to window capture using OBS's xcomposite plugin. As a workaround, the desktop entry launches in backward compatibility mode. If you are launching from command line, the same behavior can be acheived by setting the WAYLAND_DISPLAY environment variable to x11:

$ WAYLAND_DISPLAY=x11 gammarec

Lossless encoding

GammaRec supports lossless encoding for both video and audio.

To enable lossless video encoding, open the encoding options dialog and set the Target to quality and the Quantizer to 0. You do not need to specify a value for the Bitrate field.

To enable lossless audio encoding, set the Audio codec to pcm. You do not need to specify a value for the Audio bitrate field.