There is no support for video/x-msvideo in totemMullYPlugin so this video don't play:
URL: http://www.pancrace.tv/


** Message: totem_plugin_new_instance
** Message: totemPlugin ctor [0xa25c628]
** Message: totemMullYPlugin ctor [0x9311898]
mode 1
mime type: video/divx
argv[0] type video/divx
argv[1] src free/demo.avi
argv[2] mode null
argv[3] autoplay false
argv[4] previewimage picts/PANCRACE-TV.jpg
argv[5] previewmessage Cliquez ici pour jouer la demo
argv[6] previewmessagefontsize 14
argv[7] allowcontextmenu false
argv[8] pluginspage http://go.divx.com/plugin/download/
argv[9] height 394
argv[10] width 512
** Message: plugin_get_value 14 (e)

** Message: SetWindow [0xa25c628]
** Message: waiting for data to come
** Message: leaving plugin_set_window
** Message: SetWindow [0xa25c628]
** Message: existing window
** Message: resize
** Message: leaving plugin_set_window
** Message: SetWindow [0xa25c628]
** Message: existing window
** Message: resize
** Message: leaving plugin_set_window
** Message: plugin_new_stream
** Message: plugin_new_stream type: video/x-msvideo url: http://www.pancrace.tv/free/demo.avi
** Message: Guessed mime-type 'video/x-msvideo' for 'http://www.pancrace.tv/free/demo.avi'
** Message: plugin_new_stream type: video/x-msvideo not supported, exiting

Other information:
Totem-CVS, Gstreamer-CVS, Gst-plugins-*-CVS and Gst-ffmpeg-CVS

The file play's fine in the standard Totem Movie Player when downloaded. But when streamed it have some audio problem (bug #362674).