A friend of mine uses windows and he uses several programs to do video conversions of video files he gets from newsgroups and then posts to them (encrypted as zip files) after they are completed...
He told me he doubts if there are programs in linux that match the ones he uses in windows...I told him i'd inquire on the ubuntu forum to see if anyone can make suggestions on appropriate linux available programs, so a list of linux ones that will do the job as well would be appreciated (assuming there are of course)....I've been trying to encourage him to try ubuntu but he always seems to feel that he would not have access to the same quality programs he gets in windows...

Here is what he uses

"I use a program from TMPGEnc called Video Mastering Works 5 for major conversion work. Another program that is sometimes necessary for audio demuxing is Pazera Audio Extractor. I also use the 7-Zip file manager program, and a program called QuickPar, both of which are used to slice and dice the files. For posting, I use Camelsystem's Power Post.

See what you can do, but I doubt if you will find anything like TMPGEnc's program--- it's a workhorse."