answering Q2:

1. PAL (Japan, Europe, Australia, NZ etc) 25 fps
2. NTSC (Taiwan, US, etc) 29.97 fps
3. FILM 23.976 fps

when you stansform from 1 to 3,
total time of movie will be longer
you will need to tranform sound as well,
otherwise you'll get shorter sound, compared to transformed video

Ans:
can be done, but harder to do