Another detail: when tried it with gst-launch printing out messages:

jakob@leptop:~$ gst-launch ladspa-sine-fcac ! autoaudiosink -v -m
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
Got Message from element "autoaudiosink0" (state-changed): GstMessageState, old-state=(GstState)GST_STATE_NULL, new-state=(GstState)GST_STATE_READY, pending-state=(GstState)GST_STATE_VOID_PENDING;
Got Message from element "ladspa-sine-fcac0" (state-changed): GstMessageState, old-state=(GstState)GST_STATE_NULL, new-state=(GstState)GST_STATE_READY, pending-state=(GstState)GST_STATE_VOID_PENDING;
Got Message from element "pipeline0" (state-changed): GstMessageState, old-state=(GstState)GST_STATE_NULL, new-state=(GstState)GST_STATE_READY, pending-state=(GstState)GST_STATE_PAUSED;
Got Message from element "ladspa-sine-fcac0" (state-changed): GstMessageState, old-state=(GstState)GST_STATE_READY, new-state=(GstState)GST_STATE_PAUSED, pending-state=(GstState)GST_STATE_VOID_PENDING;

And after that it hangs.

On Mon, Sep 29, 2008 at 7:54 PM, Jakob Leben <jakob.leben@gmail.com> wrote:
If I simply connect ladspa-sine-fcac to autoaudiosink and play the pipeline there is no sound (I checked that the oscillator properties are freq:440, amp:1.0).

Do i need another element? Looks like oscillator doesn't push buffers or is not pulled or something.

Jakob Leben