[Boon Ong] “Given PAL duration at 30sec and been converted to NTSC, what timing should it be?
“
30 seconds.
PAL runs at (approx.) 25 frames per second, and NTSC at (approx.) 30 frames per second.
But the SECONDS (time) is what should remain constant.
You need to “standard convert” from one standard to the other.
Part of the standards conversion is a change in the rate at which the frames are presented in real-time.
30 full seconds should playback as 30 full seconds, regardless of the frame rate.