here is the current hardware requirements for cinelerra from the community version website
http://cinelerra.org
Hardware requirements
Cinelerra is by no means a "light" program. The demands of reading, decoding and playing video on your system can be quite taxing and very resource hungry. Performance and thus usability of Cinelerra is directly related to the speed, I/O, video and memory of your hardware and to the type of stress that you expect to put on the system. For some users working with audio only or light video formats, a small system might prove sufficient, but to anyone trying to work on DV with several tracks of audio plus a healthy set of effects and transitions, it would be completely useless. As a general rule, it is suggested running cinelerra on systems with not less than the following specs:
* CPU speed
At least 500 MHz CPU speed, anything less would be useless. Dual-core and SMP processors greatly improve Cinelerra speed.
* Memory
When working with video, a large amount of memory available can help speed up things by avoiding unnecessary disk swaps and keeping material ready accessible. To get a basic idea of what Cinelerra can do you should have at least 256 Megabytes of memory. To really use Cinelerra for larger projects much larger (> 1 Gb) memory space would be required.
* Storage
Storage requirements are based on your particular video editing needs. If you expect to produce long pieces in heavy formats (DV uses about 3.5 Megs per second, or 12 Gigs per hour) you should get large (>200 Gb) and fast disk drive. For smaller projects you might get away with 1 Gb. Video editing can be quite I/O intensive. For better results be sure to use a fast drive and to configure it appropriately.
* Video adapters
Since version 2.1, Cinelerra can benefit from OpenGL hardware acceleration. Make sure the video card you use supports OpenGL2.0 in order to benefit from that acceleration. Nvidia series 7 (ie. 7600GS) are known to work well. If you are interested on producing a composite signal to send directly on a TV or Video Recorder, make sure your video card of choice supports it.
* Multiple monitors
You can use XFree86's Xinerama features to work on multiple monitor heads. This feature can be a very effective way of increasing productivity.
* TV-Out
If your Adapter supports a TV-Out option, connecting a TV or S-Video monitor to it is a great way to view your material as it will be seen on TV screen.
* Video grabbers
If you have an analog video camera, or want to grab video from a trusty old VCR, you need some sort of video grabber. Video grabbers are supported through Video4Linux in Cinelerra.
* Firewire
Firewire is the fastest way to download material into your system. Unless you will be downloading all you media materials from a CD or any other pre-captured format (or use an analog video grabber), you will need firewire on your system.
* DV cameras
There is an large variety of DV cameras that can be used with Cinelerra. As a matter of fact almost any camera that can connect to firewire will work. What is important is to be sure to set the appropriate parameters on the video grabbing system to match the particulars of your camera.