Can I get smoother playback by converting a video to a non-interpolation codec?
Many different factors can contribute to stutter in video playback.  It could be a CPU issue (check your CPU when playing the video) in which case, a simpler codec or a player that can leverage the graphics card for decoding would help.  It could also be data rate related though.  In this case, using a simpler format would actually compound the problem as less compressed formats (easier to decode) require proportionally more disk space to store the same quality.  

If you are constrained by memory or disk I/O then you would actually make it stutter more by moving to a simpler format (and there would also be quality loss unless you made the file size much much higher due to loss of compression efficiency as well as a second generation encoding penalty.)