[HELP] Reducing frame rate 60fps ->30fps

[Selur]

Wild guess: Your video if vfr and not cfr and the time codes are messed up.
Try enabling Config->Internals->Handling->Ingore all input timecodes

Also instead of blindly dropping every second frame I would recommand to use:
a. Filtering->Vapoursynth->Restore->sRestore with Frate set to '30'
or
b. Filtering->Avisynth->Fra,es>Restore->sRestore with Frate set to '30'

Cu Selur