I know dragon player based on phonon, and I installed gstreamer0.10 as backend.
I have installed
gstreamer0.10-good
gstreamer0.10-base
gstreamer0.10-ugly
gstreamer0.10-bad
gstreamer0.10-ffmpeg

Now I can see the video, but no sound when sound track is DTS, TRUEHD.
Any ideas to solve this?

try VLC and/or sMplayer - not a solution, but alternatives

you need libgstdtsdec.so per gstreamer website, in my distro it's in pkg gstreamer-0_10-plugins-bad-orig-addon