The video's dimensions must not exceed 800x600. This is so video files keep a decent filesize and do not increase the beatmap's size by too much.Explaining better.
The rule cover up only a single aspect ratio: the 4:3 (means that width/height proportion is 4:3, and is used by old CRT TVs and older monitor ), and the max resolution is 800X600.
Differently, new PCs and TVs have another aspect ratio, 16:9 to be more similiar to cinema's widescreen, and the resolution limit of those type of videos was 854X480 as an "agreement" within the community.
And still the rules didn't cover the usable formats ("container" more correctly) and the fact they shouldn't have the audio on.
- Video's dimensions must not exceed 800x600(4:3) or 854X480(16:9). This is so video files keep a decent filesize and do not increase the beatmap's size by too much.
- The extension of the video should be "avi" or "flv" and it shouldn't have an Audio Track, as the beatmap audio arleady provide that, so the video load on the Computer is decreased.