Blu Ray has many substandards. You can for example have 24 fps, 25fps or 30fps (29.97 fps). So the fist one is cinematic standard for source files scanned by frame from the cinema film tape. The second one is for PAL source files. The third one is for source NTSC files. So for example if there is an old film released on BLU which was originally scanned from the cimena film tape it will probably be saved in 24 fps. If it was released before on DVD and all what is avaliable are the high resolution PAL or NTSC files it will be released in 25 fps or 30 fps.
NTSC and PAL standards were invented for broadcasting analog TV. But then they were used to record analog tv programmes and later on to digitally record the programmes. PAL is not only about number of lines. It is basically what people now call 50i. Picture is saved as 50 half frames. NTSC is 60i - 60 interlaced frames. Interlaced signal and half frames were invented to reduce radio band used for one TV channel back in analog tv times.
Over the years PAL and NTSC have evolved and they still exist even on BLU RAYS. Of course every BLU RAY player will play both standards. So why would you worry about them?
The problem starts when you record something on a digital device. Some of them allow you to choose between 25 fps and 30 fps. But many of them record in 30 fps (29.97) or 60 fps. Then to keep quality and avoid recompression the best way is to just record your BLU RAY in the same format as source files. And this is whay I have been trying to do.
So please... if you do not know the answer to my question just do not post anything in this topic. I do not need a lecture that there is no NTSC BLU or 30 fps BLU. There is and I can record them now. But I am just looking for an easier way which does not involve editing the project file in the text mode.