Reducing the frame rate : the smooth video Issue
In order of preference,


Generate animation at 25 FPS and capture it at 25 FPS.
Generate animation at 50 FPS and capture it at 50 FPS. Then, use FFmpeg to generate a 25 frames &amp; 50 fields per sec stream. Stream should be flagged as interlaced. x264 doesn't do interlaced well, so I suggest video codec ought to be MPEG-2 or DV.
Generate animation at 50 FPS and capture it at 25 FPS.