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What Digital Format is this??
Came across a recorded segment on my VHS. Frame advance showed it to have only 15 images recorded every sec. Each frame was repeated making it 30 frames per sec or 60 interlaced fields broadcast over the air.
For sure, it must have been shot using Digital Cameras. I did not know of the 15 fps digital format. I thought 25 fps was the min, which is suitable for PAL and 30 fps for NTSC.
I recall from my school years, 18 frames per sec is minimum for not to notice motion jumps. 24 fps of film is just to make sure that no one detects discrete frames and 48 flashes of film per sec is used to eliminate flicker. 15 fps is not too far off from the min 18. Knowing that the movie contains only 15 images per sec, I might detect the discrete motions next time, otherwise it wasn’t noticeable.
Obviously they used 15 fps (instead of 25 or 30 fps) format to maximize the tape capacity. Actually, I will prefer 15, 24, 25 or 30 fps (refresh rate of 60 Hz) progressive as opposed to 60 interlaced fields of NTSC broadcast or 50 interlaced fields of PAL broadcast.
HOW IS THE ABOVE RELEVANT TO INDIAN DVDs:
Extras (interviews etc) are shot using old style interlaced cameras and hence are interlaced video, always. Even if they have digital cameras, they still can shoot interlaced PAL/ NTSC signal, and they do. It will be better if they shoot the material for DVD extras in digital format. Shooting on Film is better but never done for extras. Even 15 frames per sec digital is better than PAL or NTSC.
Rana
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