i tried to use mpeg2subt to see subs from a DVB capture (a mpeg PS containing subs)

i knew it contains subs as with mpegdemux, it used to tell me :
** (totem:8573): WARNING **: don't know how to handle video/x-dvd-subpicture
** (totem:8573): WARNING **: unknown stream found

so, i choosed dvddemux instead, which handles subs, and the following pipeline
crashed :

gst-launch filesrc location=MCM\ POP\ -\ October\ 25\ 01\ 59\ 34.mpg ! dvddemux
name=demux ! mpeg2subt ! ffmpegcolorspace ! xvimagesink
EXECUTION du tube en cours ...
ERROR (0x8050900 - 306408:32:15.543270000)        GST_PADS(22244)
gstpad.c(3280):gst_pad_pull:<mpeg2subt0> pull on pad mpeg2subt0:video but it was
unlinked
ERROR: from element /pipeline0/mpeg2subt0: Internal GStreamer error: pad
problem.  File a bug.
Additional debug info:
gstpad.c(3280): gst_pad_pull: /pipeline0/mpeg2subt0:
pull on pad mpeg2subt0:video but it was unlinked
ERROR (0x8050900 - 306408:32:15.756690000)       scheduler(22244)
gstoptimalscheduler.c(2627):gst_opt_scheduler_iterate:<GstOptScheduler@0x82084f0>
in error state
Execution ended after 1 iterations (sum 213728000 ns, average 213728000 ns, min
213728000 ns, max 213728000 ns).

got latest CVS of everything (gst core, plugins, ffmpeg and totem)