I've been having the same kind of issues but with folders containing audio clips. I have seen no ill effects when browsing folders with video files. After some initial trial and error learning how to perform a backtrace, the one for Nautilus I have attached here. Hope it helps. I don't know enough to make heads or tails of it.
For anyone else that needs help in creating a backtrace, I installed nautilus-dbg from the repositories and followed the directions for backtracing at https://wiki.ubuntu.com/Backtrace for an already running process. ** Attachment added: "Backtrace of Nautilus crash/hang" http://launchpadlibrarian.net/11787140/gdb-nautilus.txt -- nautilus video preview engenders crashes https://bugs.launchpad.net/bugs/164452 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs