Hi,

 >> For example, if I need to setup and run a video playback pipeline, is
 >> this the right command:

 >> gst-launch filesrc location=test.ogg ! oggdemux name=demux demux. !
 >> MixVideoDecoderH264 ! queue ! vaimagesink demux. ! queue ! vorbisdec !
 >> pulsesink

 'MixVideoDecoderH264'?
Usually theora is the video codec used in ogg containers. 'theoradec' plugin 
will decode that.

 >> My question is also around the used Qt Multimedia APIs, how a Meego
 >> video application that uses QtM APIs controls the gstreamer pipelines?

Internally meegovideo uses 'playbin2'

 >> I have to be sure that Meego video sets up correctly the pipeline.
 >> Is it using the right HW accelerated gst element?

Just run $ gst-launch playbin2 uri=file://$PWD/test.ogg -v
This will give you details of what plugins playbin2 chooses to demux and decode.

 >> How the needed properties are passed when the playbin2 is used?
Based on the caps and the RANK of the plugins, sorry I don't know in detail.

Regards,
Sharavana,
Aricent Technologies,
Bangalore.

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