SlackBuildsOrg/multimedia/xjadeo

Xjadeo is a software video player that displays a video-clip in sync with an
external time source (MTC, LTC, JACK-transport).

Xjadeo is useful in soundtrack composition, video monitoring or any task that
requires to synchronizing movie frames with audio events.

Xjadeo supports a multitude of video file formats, display libraries and sync
sources. It includes an optional GUI called qjadeo that provides setup
options, file history, video import/transcoding and control of Xjadeo's
run-time parameters.

Optional dependencies are portmidi, lash and imlib2