@rendez2k
thanks for sending the sample clip. It seems that the stuttering issue is caused by the 'convertfps=true' flag in the DirectShowSource call. Removing it, or using FFMpegSource, along with the NTSC->PAL 4% speed option on, video playback is smooth. Please confirm if it works for you as well.
As a matter of fact, 'convertfps=true' should be used when video framerate is variable (VFR). From the next release, I will add this flag only if it is really necessary.
Bye