I have shot a few clips using a Panasonic LX100 at 50p Full HD.
I created a project in Blender 2.77 and am trying to slow down some of these strips to get a dramatic, smooth and stable effect, so I applied a speed control effect strip (speed factor: 1, multiply speed: 0.5) to them and the slowdown is previewed fine in the viewport (it seems to me, although my computer is not powerful enough to preview all frames).
When I render the project however (with an output frame rate of 25fps and "100 old / 100 new" time remapping settings), I can distinctly see that the playback of the strips I slowed down is jagged, ie. I see the distinct frames coming up, no smooth playback. The speed is fine but playback fps seem to be half of 25 fps.
How can I achieve a smooth slow-motion effect? I have double the needed frames (source footage 50p) so it should work to output slow and smooth 25fps video, right?