an@jan /media/sda6/src/mplayer $ gmplayer -ac hwac3 dvdnav://
MPlayer dev-SVN-r24891-4.2.2 (C) 2000-2007 MPlayer Team
CPU: AMD Turion(tm) 64 Mobile Technology ML-30 (Family: 15, Model: 36, Stepping: 2)
CPUflags:  MMX: 1 MMX2: 1 3DNow: 1 3DNow2: 1 SSE: 1 SSE2: 1
Compiled for x86 CPU with extensions: MMX MMX2 3DNow 3DNowEx SSE SSE2

Playing dvdnav://.
libdvdnav: Using dvdnav version 0.2.1cvs from http://dvd.sf.net
libdvdnav: DVD Title: DVDVOLUME
libdvdnav: DVD Serial Number: 43E4C7E2
libdvdnav: DVD Title (Alternative): 
libdvdnav: Unable to find map file '/home/jan/.dvdnav/DVDVOLUME.map'
libdvdnav: DVD disk reports itself with Region mask 0x00c00000. Regions: 1 2 3 4 5 6
Remember to disable MPlayer's cache when playing dvdnav:// streams (adding -nocache to your command line)
DVDNAV, switched to title: 1
MPEG-PS file format detected.
VIDEO:  MPEG2  720x576  (aspect 3)  25.000 fps  7500.0 kbps (937.5 kbyte/s)
==========================================================================
Opening video decoder: [mpegpes] MPEG 1/2 Video passthrough
VDec: vo config request - 720 x 576 (preferred colorspace: Mpeg PES)
Could not find matching colorspace - retrying with -vf scale...
Opening video filter: [scale]
The selected video_out device is incompatible with this codec.
Try appending the scale filter to your filter list,
e.g. -vf spp,scale instead of -vf spp.
VDecoder init failed :(
Opening video decoder: [libmpeg2] MPEG 1/2 Video decoder libmpeg2-v0.4.0b
Selected video codec: [mpeg12] vfm: libmpeg2 (MPEG-1 or 2 (libmpeg2))
==========================================================================
==========================================================================
Forced audio codec: hwac3
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
No accelerated IMDCT transform found
hwac3: switched to AC3, 448000 bps, 48000 Hz
AUDIO: 48000 Hz, 2 ch, ac3, 448.0 kbit/29.17% (ratio: 56000->192000)
Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
==========================================================================
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
Starting playback...
VDec: vo config request - 720 x 576 (preferred colorspace: Planar YV12)
VDec: using Planar YV12 as output csp (no 0)
Movie-Aspect is 1.78:1 - prescaling to correct movie aspect.
VO: [xv] 720x576 => 1024x576 Planar YV12 
==========================================================================                                                                                                         
Forced audio codec: hwac3
Opening audio decoder: [hwac3] AC3/DTS pass-through S/PDIF
No accelerated IMDCT transform found
AUDIO: 48000 Hz, 2 ch, ac3, 192.0 kbit/12.50% (ratio: 24000->192000)
Selected audio codec: [hwac3] afm: hwac3 (AC3 through S/PDIF)
==========================================================================
AO: [alsa] 48000Hz 2ch ac3 (1 bytes per sample)
A:   0.4 V:   0.5 A-V: -0.127 ct:  0.031  15/ 15 11% 10% 32.1% 4 0