Obviously, formatDuration is only applicable to media items that are time-based.
formatDuration does not describe the time required to utilize a resource in a setting (such as a classroom), but is rather a strict playback time, TimeStart to TimeEnd.
recommends flexibility in expressing time stamps. Radio producers
often prefer the simple HH:MM:SS designation. Television producers
prefer the SMPTE time code standards HH:MM:SS:FF. Some multimedia
architectures express time in HH:MM:SS.mmm, where the mmm represents
Consequently, the best practice is to match the
time stamp designation to your preferred method:
- HH:MM:SS:FF (SMPTE Timecode nondrop frame-NTSC)
- HH;MM;SS;FF (SMPTE Timecode drop frame-NTSC)