Dunno how long it takes to get approval for a jpeg, but I've sussed it.
The error report said Can't append avi because different sampling rates, quoting 2 sample rates identical to 6 decimal places. I forgot framerate is a rational value. Interestingly the 2 hex numbers in the error report (which did the trick) do not divide to give the stated fps (29.85614), but precisely 29. Maybe someone can make sense of that.
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