Cinelerra - Capture, Compose Edit video & Audio

Turn your Linux box into a complete audio and video production environment. This is the developer resource for all things related to the system. Cinelerra does primarily 3 things: capturing, compositing, and editing audio and video with sample level accuracy. It's a movie studio in a box. Cinelerra also includes a video compositing engine, allowing the user to perform common compositing operations such as keying and mattes.
Its features include:

• Compositing + editing
• Still image panning
• VU meters
• Unlimited tracks
• 16 bit YUV compositing
• floating point compositing
• Background rendering on clusters
• Free form editing
• Firewire, MJPEG, bttv video I/O
• Firewire, OSS, Alsa audio I/O
• Batch capturing
• Batch rendering
• SMP utilization
• Realtime effects
• Quicktime, AVI, MPEG, and image sequence I/O
• OpenEXR images
• OGG Vorbis audio
• 64 bit internal audio representation
• Headroom monitoring
• LADSPA plugins
• Bezier masks
• Track routing like a real console
• Track nudge for audio and video
• Reverse audio and video in realtime
• Bidirectional, variable speed scrubbing
• Different overlay modes
• Nested sequences

Alternative websites:
http://sourceforge.net/projects/heroines/
http://www.heroinewarrior.com/cinelerra.php