Qxmp is a light media player (based on Mplayer) for Linux and Unix workstations. With it, you can easily play a wide variety of video and audio files and streams using a simple and clean interface. Only Mplayer and Qt are required (no database, gstreamer, or taglib). It provides a light playlist editor and bookmarks manager.
iShowU is software to capture and record video from your screen into a Quicktime movie in real-time. Create tutorials, make a demo for the Web, record your favorite game, collaborate on UI design, or show tech support what's really going on with that broken program. It allows you to capture and record anything you can see on your screen, along with audio from any compatible source.
avidentify is a command line tool that extracts and prints various meta-information about media files: width, height, frame rate, video codec, audio codec, audio sample rate, audio bitrate, file format, etc. It uses ffmpeg's libavformat library to read the video files, thus MPEG, AVI, WMV, MP3, Ogg, and many other file formats are supported. avidentify is similar to MPlayer's midentify tool, but it has far fewer dependencies.