Among the new features introduced by NX 4, there is the possibility to record the session.

The start, pause and stop of recording can be managed via the NX toolbar, a rollaway utility bar that allows the user to access session settings and services.

Registered sessions are saved by default in WebM format. Ogg and MPEG-1 formats are supported too.

However, the video file of the session can be played also by the NX built-in video player. Access to the control panel for managing the play of the video is available from the NX toolbar.

To create a video the NX agent adopts a similar method to the implementation behind the streaming of videos . The encoding format is the same, the difference is that the encoded frames are not streamed through the transport layer, but they are written to a file.

Similarly, playback of an NX session video file in NX Player uses the same libraries as those adopted in video streaming for encoding and decoding.