Subtitler:I have a NTSC program converted to PAL

I have a NTSC program converted to PAL. I use change framerate, but timecode is still slipping.

It depends on how the NTSC-PAL conversion was made. If it was a time-accurate video-conversion, then you can set:

If the conversion was made with a simple pulldown like MPEG conversions and the duration has changed, you need to make it in two steps. First correct the duration, then the framerate: