As for Cinelerra, i would grab a rpm and "rpm2targz" for slackware and then hand install it that way. It always worked for me. Other than Cinelerra, there is Kino, Broadcast 2000 (old), Jahshaka, Mainactor (Commercial) and then there is the Apple products for linux that cost a lot for home use - i think the program is called Shake.
If you need help, i can post a link to a Cinelerra download that has been built and already been rpm2targz. I also have a couple Cinelerra builds for 64bit if you need those as well.