[HELP] "Real" PAL<>NTSC framerate conversion with speed changing?

[DannyHicks]

Thanks for your fast reply!

I'm not sure we're on the same page. I don't want a speed-change. I want to convert PAL to NTSC and vice versa in a way it will cause the video to change in speed, as more or less frames should be played in 1 second. I don't want to affect the total number of frames.

You see, a converter, asked to convert 25 fps to 24 fps (actually 23.97.. fps, can do one of the following:

1. Throw away a one frame every second.
   
2. Keep all frames, making the clip like 4.3% (I think) longer.
   

It's the second thing I'm looking for. I'm not sure we're talking about the same thing here. I'm also not sure if "23.976" isn't precisely enough. There might be more decimals after it.

Note: I assume the source:

• is cfr and not vfr
  
• progressive, not telecine or interlaced
  

I have to admit these terms go beyond my knowledge of video encoding (if that's the right word even).