HenryHu, I just noticed that you wrote:
mplayer-vdpau-3402051.tar.gz, Mplayer dev-SVN-r28348-4.2.1
That MPlayer version and patch-set is extremely old. I believe if you upgrade to the latest MPlayer SVN, your problem should be solved.
That said, irrespective of any bugs in the VDPAU integration into MPlayer, our driver should not behave in the manner you observed. Whilst I can reproduce the MPlayer crash you mentioned with your old version, I don't actually see that behaviour. Unfortunately, this means we probably can't fix that issue.