Troubleshoot OGV playback?

[Andrés G. Aragoneses]

Hi there,

I've got an opensource GStreamer-based app which plays OGV perfectly with
GStreamer 1.0, but it doesn't (plays audio, and see video in black) with
GStreamer 1.2.

I know it's not a system problem because other opensource app (totem) plays
the video fine with 1.2.

So how can I start troubleshooting this problem with my app?

Thanks
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