Download the latest commit from master branch to get updates. No stable release exists at the moment as Stingray is still in early development stage.
Stingray requires SDL2 and libav/ffmpeg (libavcodec, libavformat, libavutil)
On debian / ubuntu :
The usual should do :stingray is then available as `/usr/bin/stingray`. The video conversion helper is in `/usr/bin/stingray-converter`.