It might help if you open smplayer in a terminal (from the command line) and repeat the steps above. It will likely give more info as to the cause of the crash. Copy the messages into a post here.
Also, before you change the setting to vdpau, open options > view logs > mplayer log. There might be some clues there. Mine looks like this
Code:
/usr/bin/mplayer -noquiet -nofs -nomouseinput -vc ffh264vdpau,ffmpeg12vdpau,ffwmv3vdpau,ffvc1vdpau, -sub-fuzziness 1 -identify -slave -vo vdpau -ao oss -nokeepaspect -framedrop -nodr -double -input nodefault-bindings:conf=/dev/null -stop-xscreensaver -wid 83886423 -monitorpixelaspect 1 -*** -embeddedfonts -***-line-spacing 0 -***-font-scale 1 -***-styles /home/crk/.config/smplayer/styles.*** -fontconfig -font Arial -subfont-autoscale 0 -subfont-osd-scale 20 -subfont-text-scale 20 -subcp ISO-8859-1 -vid 0 -subpos 100 -volume 100 -cache 2000 -osdlevel 0 -slices -channels 2 -af scaletempo,equalizer=0:0:0:0:0:0:0:0:0:0 -softvol -softvol-max 110 /home/crk/Videos/Moon(2009).mkv
MPlayer SVN-r31042-Ubuntu-RVM (C) 2000-2010 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Cache fill: 0.00% (0 bytes)
ID_VIDEO_ID=0
[mkv] Track ID 1: video (V_MPEG4/ISO/AVC), -vid 0
ID_AUDIO_ID=0
ID_AID_0_LANG=und
[mkv] Track ID 2: audio (A_DTS), -aid 0, -alang und
[mkv] Will play video track 1.
Matroska file format detected.
VIDEO: [avc1] 1024x426 24bpp 23.976 fps 0.0 kbps ( 0.0 kbyte/s)
ID_FILENAME=*****
ID_DEMUXER=mkv
ID_VIDEO_FORMAT=avc1
ID_VIDEO_BITRATE=0
ID_VIDEO_WIDTH=1024
ID_VIDEO_HEIGHT=426
ID_VIDEO_FPS=23.976
ID_VIDEO_ASPECT=2.4038
ID_AUDIO_FORMAT=8193
ID_AUDIO_BITRATE=0
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=6
ID_LENGTH=5829.80
ID_SEEKABLE=1
ID_CHAPTERS=0
Couldn't open video filter '***'.
***: cannot add video filter
[***] Init
[***] Updating font cache
==========================================================================
Forced video codec: ffh264vdpau
Opening video decoder: [ffmpeg] FFmpeg's libavcodec codec family
Selected video codec: [ffh264vdpau] vfm: ffmpeg (FFmpeg H.264 (VDPAU))
==========================================================================
ID_VIDEO_CODEC=ffh264vdpau
==========================================================================
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, s16le, 768.0 kbit/50.00% (ratio: 96000->192000)
ID_AUDIO_BITRATE=768000
ID_AUDIO_RATE=48000
ID_AUDIO_NCH=2
Selected audio codec: [ffdca] afm: ffmpeg (FFmpeg DTS)
==========================================================================
AO: [oss] 48000Hz 2ch s16le (2 bytes per sample)
ID_AUDIO_CODEC=ffdca
[Mixer] No hardware mixing, inserting volume filter.
Starting playback...
[VD_FFMPEG] Trying pixfmt=0.
Movie-Aspect is 2.40:1 - prescaling to correct movie aspect.
ID_VIDEO_ASPECT=2.4038
VO: [vdpau] 1024x426 => 1024x426 H.264 VDPAU acceleration
[VD_FFMPEG] XVMC-accelerated MPEG-2.
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