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Browse: Home / v2 / Elements / pbcoreDescriptionDocument / pbcoreInstantiation / instantiationEssenceTrack / essenceTrackTimeStart

essenceTrackTimeStart

The descriptor essenceTrackTimeStart provides a time stamp for the beginning point of playback for a time-based media item, such as digital video or audio. Use in combination with essenceTrackDuration to identify a sequence or segment of a media item that has a fixed start time and end time.

XPATH LOCATION:

/ pbcoreDescriptionDocument / pbcoreInstantiation / instantiationEssenceTrack / essenceTrackTimeStart

USAGE RULES:

Occurs:

1 time or less

May Contain:

Contained by:

Contained with:

[Any elements used MUST appear in this relative order]

EXAMPLES:

  • <essenceTrackTimeStart>00:00:32:05</essenceTrackTimeStart>

VOCABULARIES:

PBCore 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 milliseconds.

Consequently, the best practice is to match the time stamp designation to your preferred method:

  • HH:MM:SS
  • HH:MM:SS.mmm
  • HH:MM:SS:FF (SMPTE Timecode nondrop frame-NTSC)
  • HH;MM;SS;FF (SMPTE Timecode drop frame-NTSC)

One response to “essenceTrackTimeStart”

  1. Marcos Sueiro
    Marcos Sueiro November 2, 2011 at 5:16 pm |

    It is unclear to me how to use this element without a corresponding reference at the asset or instantiation level, unless it is implied that the complete asset or instantiation starts at 00:00:00, in which case it should be specifically pointed out in the description here.
    In the example above, it is unclear what 00:00:32:05
    refers to. 00:00:32:05 from where?

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