Videoconvert i420->rgb not working

[Edward Anon]

I have a pipeline that takes an h264 encoded RTP stream and passes it too
my application. The relevant portion is:
... -> avdec_h264 -> videoconvert -> appsink.


The appsink expects video/raw rgb.

>From one device the stream comes in as Y444 and then all works as expected.
However, when I switch to an embedded device (as the source of the stream)
I get I420. In this case I get a not negotiated error and the videoconvert
element complains it cannot make the conversion.

I'm not sure why this would happen as videoconvert takes I420 input and
should be able to output RGB. I thought maybe scaling was an issue so tried
adding a videoscale element after the videoconvert but tht did not help.

Any thoughts?
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