a couple of questions getting started with gstreamer development

[Chuck Crisler]

I am trying to experiment with some pipelines to get some basic working
experience with gstreamer in my environment (CentOS 5.6/CentOS 6.0). I
tried the following very basic pipeline:

gst-launch -v videotestsrc pattern=snow ! xvimagesink

The error I received was:

ERROR: from element /pipeline0/xvimagesink0: Could not initialize Xv output
...
xvimagesink.c(1342): gst_xvimagesink_get_xv_support ():
/pipeline0/xvimagesink0: No port available

What have I done wrong? Also, where is the source for these plugins so I
can look it up in the future (though I still may not really understand the
error)?

Next question: I have seen references to mpeg2dec but can't seem to locate
it on either of my systems (CentOS 5.6 and Fedora 16). I am still setting
everything up and may have missed it. Where should I be able to find it and
the documentation for it?

Thank you very much,
Chuck Crisler
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