Usually I do not use VFR sources (from mobile), but in this case this was the only source and I want to keep it.
I knew that I can use HandBrake to re-encode to CFR and I did this.
However, when checked I realised that HandBrake just duplicated some frames to meet requirements.
Are there any way to convert VFR to CFR with some kind of interpolation?
P.S. At this time I'm playing with InterFrame2 AviSynth script. Looks good.