Can't get appsink to emit new-sample?

[pisymbol .]

Pipeline snippet:

... ! omxh264enc control-rate=2 bitrate=30000000 ! video/x-h264,
stream-format=(string)byte-stream ! h264parse ! appsink name=appsink0
emit-signals=true

I am then using:

appsink0 = recorder_bin.get_by_name("appsink0")
appsink0.connect("new-sample", on_new_sample, 0)

def on_new_sample(sensor_id):
   """ Why is this so hard? """
   print(sensor_id)
   return Gst.FlowReturn.OK

Is there something else I should be doing to get appsink to emit the
'new-sample' callback? I do have an appsrc0 somewhere else I plan to send
buffers I catch in appsink0 to but I'm not sure that is relevant here.

-aps
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