I've done some more digging. Using the gstreamer debugging options, I've
at least identified a difference between totem and rhythmbox here.

I can see totem somehow translates the smb:// url to the fuse mount path
and just uses the filesrc gstreamer source element to read the file (and
can successfully play it):

0:00:00.722405619  2515 0x7ffd6bfd3730 INFO                 filesrc 
gstfilesrc.c:374:gst_file_src_set_location: filename : /home/john/.gvfs/music 
on lion/Music/Therapy/Therapy - Nurse/Teethgrinder.mp3
0:00:00.722418749  2515 0x7ffd6bfd3730 INFO                 filesrc 
gstfilesrc.c:375:gst_file_src_set_location: uri      : 
file:///home/john/.gvfs/music%20on%20lion/Music/Therapy/Therapy%20-%20Nurse/Teethgrinder.mp3


rhythmbox doesn't use the fuse mount - instead using the gio_src gstreamer 
source element. It appears to be continue reading it fine, though as explained 
above the output goes silent after about 1 or 2 seconds.

0:00:01.292036091  2468       0xf8c8d0 DEBUG                gio_src
gstgiosrc.c:335:gst_gio_src_get_stream:<source> opened location
smb://lion/music/Music/Therapy/Therapy%20-%20Nurse/Teethgrinder.mp3


But I can have gstreamer play the file successfully using giosrc using 
gst-launch:

gst-launch-0.10 giosrc location="smb://lion/music/Music/Therapy/Therapy
- Nurse/Teethgrinder.mp3" ! flump3dec ! autoaudiosink

I've attached debug logs of my gst-launch and the rhythmbox commands
attempting to play the same file - using the options
GST_DEBUG_NO_COLOR=1
GST_DEBUG="gio_src:5,gio_base_src:5,basesrc:5,gnomevfs:5,filesrc:5"

There are some differences between the two, but I'm not sure what is
relevant. In particularly, one appears to be in push mode and one pull.
They both read the file in 4k chunks, but rhythmbox does it from a weird
initial offset for some reason (perhaps due to it reading metadata info
though). Nothing obviously conclusive to me though.

** Attachment added: "gst-launch-and-rhythmbox-debug-logs.tar.gz"
   
https://bugs.launchpad.net/ubuntu/+source/rhythmbox/+bug/977866/+attachment/3221312/+files/gst-launch-and-rhythmbox-debug-logs.tar.gz

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https://bugs.launchpad.net/bugs/977866

Title:
  no sound while playing music from a gvfs mounted samba share

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