videorate doesn't drop or duplicate frames in live stream?

[gotsring]

I'm using gstreamer 1.16.2 and C++ to process a IP cam video feed. I use the
videorate element to even out the live stream which averages ~30 FPS. I need
a smooth 20 FPS, so videorate should duplicate frames during the occasional
dropouts and drop the excess frames, so I have a pipeline as follows:

souphttpsrc location=http://192.168.1.145/mjpeg is-live=true ! queue !
jpegdec ! videorate ! 'video/x-raw, framerate=20/1' ! d3dvideosink

All this seems to do is re-timestamp all frames with a duration of 50ms, so
nothing is ever dropped or duplicated, messing up anything I do downstream.
I'm guessing this is probably because the incoming frames have no
timestamps. 

Adding the do-timestamp option in souphttpsrc causes jpegdec to fail (messes
with jpeg data header? still looking into this)

Inserting a timecodestamper element in front of videorate spams a bunch of
gst_time_code_is_valid assertion fails. Desite the messages, the pipeline
still runs, but the behavior is the same as the original pipeline, i.e. the
timestamps are altered, but no frames are duplicated or dropped.

Is there a property in videorate that I'm missing that can perform
rate-smoothing based on an internal clock with no reliance on frame
timestamps, or some other way to add timestamps to frames before they enter
videorate? 



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