How to send EOS in pipeline?

[dlw]

I have the following pipeline:

intervideosrc->queue->videoconvert->omxh264enc->mp4mux->filesink

I want to stop the pipeline, remove the elements. Later, on command, I will
add the elements back in and restart the pipeline.

My plan is the following:
1. Send an EOS through the pipeline
2. Detect EOS on the filesink (probe_event)
3. Set all elements to NULL
4. Remove elements from pipeline.

*How do I send the EOS?  *I've tried
-gst_element_send_event(GST_ELEMENT(pipeline), gst_event_new_eos());
-gst_element_send_event(GST_ELEMENT(intervideosrc), gst_event_new_eos());
-gst_element_send_event(GST_ELEMENT(omxh264enc), gst_event_new_eos());

In addition to sending gst_event_new_flush_start().

I can't simply set the pipeline to GST_STATE_NULL because the omxh264enc
prevents this (I've made a simplified pipeline with just
queue->videoconvert->faksink and this has no problem changing to
GST_STATE_NULL. How do I get the encoder and muxer to wrap it up and let me
stop/restart the pipeline?



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