[FFmpeg-user] For discussion: A better video notation.

[Mark Filipak (ffmpeg)]

For discussion: A better video notation.

24PPS at 23.9FPS         (aka "24p") Cinema (i.e. 24PPS) mastered at 23.9FPS, 0.1% slow.
24PPS at 23.9FPS         (aka "30i") Soft-telecined: cinema with 29.9FPS metadata, 0.1% slow.
24PPS at 25FPS           (aka "25i") Cinema with 25FPS metadata, 4% fast.
24PPS at 29.9FPS         (aka "30i") Hard-telecined: cinema converted to 29.9FPS, 0.1% slow.
25PPS at 25FPS           (aka "25i") Cinema interpolated to 25PPS, no speed up.
29.9PPS at 29.9FPS       (aka "30p") 29.9PPS video at 29.9FPS (some documentaries).
50SPS at 25FPS           (aka "25i") PAL broadcast TV interlaced to 25FPS.
50SPS+24PPS at 25FPS     (aka "25i") Mix of 50SPS at 25FPS & 24PPS at 25FPS (some "Making of" docs).
59.9SPS at 29.9FPS       (aka "30i") NTSC broadcast TV interlaced to 29.9FPS.
59.9SPS+24PPS at 29.9FPS (aka "30i") Mix of 59.9SPS at 29.9FPS & 24PPS at 29.9FPS (some "Making of" docs).
IRREGULAR at 29.9FPS     (aka "30i") Having various frame/field repeats/discards with image loss.

-- 
I don't have a dog.
And furthermore, my dog doesn't bite.
And furthermore, you provoked him.