The problem is still persist. It is reproducible in the following steps:
1. Using the clean official Raspbian image (2012-12-16-wheezy-raspbian.zip)
2. Upgrading all packages (sudo apt-get update && sudo apt-get dist-upgrade)
3. Updating the firmware (using rpi-update) script
5. compile hello_pi demos
6. run hello_video demo, although it display video, it exits with segmentation fault error
As it seems the OMX_Deinit() function cause this. I'm stuck with my raspberry because of this. I'm doing my term project with RPi, and I'm intended to do some coding with the OMX api.
I'll be thankful for your participation to resolve this issue.