Formats are currently supported: mkv, avi, mp4, wmv, gif and nut (And only WebM for Wayland's GNOME session). You can stop the recording process easily by right-clicking the icon and choosing "Stop Record". Or middle-clicking the recording icon in the notifications area
It uses the D-Bus API to connect to the built-in screencasting tool in GNOME Shell. It uses this to record video. To record audio, it launches an instance of ffmpeg in the background. After the recording is finished, it merges the two files into the WebM file.
Also, for GIF format, Green Recorder first records the required video as a raw video. And then it generated the GIF image from the raw video. In this way, you'll get an optimized GIF image size which is at least 10x better than the normal ffmpeg recording.
Add the PPA to your system, update the local repository index and install the Screen Recorder package:
|$ sudo add-apt-repository ppa:fossproject/ppa
$ sudo apt-get update
$ sudo apt-get install green-recorder
|$ sudo apt-get remove --autoremove green-recorder|