I've been a Kdenlive user since I've used Ubuntu 8.10 on an older machine of mine, and it worked great for what I needed it for.
Now that I've gotten a newer computer with a 64-bit processor running Ubuntu 9.04 64-bit, I have a problem with rendering my videos. It seems that only some formats such as Ogg Theora and RealVideo appear as usable, but other codecs like H.264, MPEG-4, etc. appear greyed out and therefore not usable. I didn't get this issue with non-64-bit 8.10 before.
Can anyone give me a hand on solving this issue?