This is a real head-scratcher. Hopefully I've supplied all the relevant info.
Summary:
Dragon Player - audio fine but no video
All other video players works correctly: vlc, mplayer, flash ...
Details:
Debian Wheezy 3.0.0-6.dmz.1-liquorix-amd64
Using Alsa not Pulse
Code:
01:00.1 Audio device: ATI Technologies Inc RV710/730
Subsystem: ASUSTeK Computer Inc. Device aa38
Kernel driver in use: HDA Intel
01:00.0 VGA compatible controller: ATI Technologies Inc RV710 [Radeon HD 4350]
Subsystem: ASUSTeK Computer Inc. Device 02a8
Kernel driver in use: radeon
Phono Audio Output HDA ATI SB (ALC887 Analog)
cat /proc/asound/cards
0 [SB ]: HDA-Intel - HDA ATI SB
HDA ATI SB at 0xfbdf4000 irq 16
1 [HDMI ]: HDA-Intel - HDA ATI HDMI
HDA ATI HDMI at 0xfbeec000 irq 44
KDE 4.6.5
Dragon Player 2.0
audio works fine
no video
VLC
both audio and video work
MPlayer
both audio and video work
KMplayer
Phonon Movie Player
audio works fine
no video
Mplayer Movie Player
both audio and video work
GMplayer
Works with X11(Ximage/Shm)
Works with X11/Xv
Works with OpenGL
X11/VIDIX sound no video
VDPAU sound no video