GStreamer errors

[Rezaul]

Hiii
I am new to GStreamer libraries and have recently installed GStreamer and its plugins(inc ffmpeg, good, bad, ugly) to my fedora 13 machine
1.Installation was quite fine and I can play mp3 using alsasink but not osssink... Can anyone suggest why is it so...
2.When I run following command I get these errors...
i)
gst-launch -v filesrc location=/home/Rezz/song.avi ! avidemux name=demux ! queue max-size-buffers=1200 max-size-time=0 max-size-bytes=0 ! faad ! alsasink 
 
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
ERROR: from element /GstPipeline:pipeline0/GstAviDemux:demux: Internal data stream error.
Additional debug info:
gstavidemux.c(4501): gst_avi_demux_loop (): /GstPipeline:pipeline0/GstAviDemux:demux:
streaming stopped, reason not-linked
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
/GstPipeline:pipeline0/GstAviDemux:demux.GstPad:audio_00: caps = NULL
/GstPipeline:pipeline0/GstAviDemux:demux.GstPad:video_00: caps = NULL
Freeing pipeline ...
 
ii)
gst-launch filesrc location=/home/Rezz/aaa.mpeg ! decodebin ! ffmpegcolorspace ! xvimagesink

Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...

(gst-launch-0.10:30466): GStreamer-WARNING **: pad mpegaudioparse0:src returned caps which are not a real subset of its template caps

(gst-launch-0.10:30466): GStreamer-WARNING **: pad mpegaudioparse0:src returned caps which are not a real subset of its template caps

---and nothing happens after that .. what to do??

Please suggest...

[^thehatsrule^]

This is the wrong place to find support for fedora...

[Rezaul]

kk...