My source media is 1440x1080i29.97 HDV. I'm rendering to 720p59.94. The playback has a strange speeding up and slowing down cadence which I can't explain. It happens whether the project properties are 1080i or 720p. The de-interlace looks good (interpolated, not blended).
A person walking, for instance, looks in the source media like:
step - - step - - step - - step - - step - - step - - step - - step -
While in the render it looks like
step-step-step - - - step-step-step - - - step-step-step - - -
Any hints?