Originally Posted by NinjitsuStylee
I should mention that the segmentation fault happens arbitrarily in the middle of encoding, not necessarily at the beginning. This particular file died at 30% completion. Earlier it died at 7%, and even before at around 25%. It's pretty much random.
Hmmm, that smells like the file has "something" (whatever it may be) in the encoding that is tripping up mencoder. Since you indicate it's at random places and with different files (at least, that's what I gather) then maybe it's in one of the binaries used? (DLL, libavcodec, etc.) I notice you're also on an older mencoder, it's possible it's a bug that's been fixed -- my FC6 system here shows 1.0rc1-4.1.1.
Feel free to PM me a link to download a (small) sample video that's crashing on you and I'll run it through my stuff, see what happens. This would at least tell us if it's something in your rig that isn't being friendly...