The difference between "p" and "i" it's in the way the frames are displayed. P comes from progresive, meanning that a frame that it's displayed line by line, while I comes from interlaced, meaning that every frame it's splitted in 2, each sub-frame it's interlaced with the other.
Here is an example of how lines are displayed
P mode:
- line 1
- line 2
- line 3
I mode
- line 1
- line 3
.
.
- line 719
-line 2
-line 4
.
.
- line 720
1080p it's the most processor consuming.
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