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Thread: MPEG-DASH(MPD@type='dynamic)/MPD@availabilityStartTime

  1. #1

    Default MPEG-DASH(MPD@type='dynamic)/MPD@availabilityStartTime

    According to the standard MPD@availabilityStartTime should not be updated between MPD updates

    8.4.2
    Media Presentation Description constraints
    - When the MPD is updated, the value of MPD@availabilityStartTime shall be the same in the
    original and the updated MPD

    But wowza update MPD@availabilityStartTime after every segment goes out of SegmentTimeline for sergment duration value.

    But according to following requirements this increase segment availability start time more and more from it's valid value as both MDP segment start time grow and availabilityStartTime grows as well.

    5.3.9.5.3
    Media Segment information
    For services with MPD@type='dynamic', the Segment availability start time of a Media Segment is the sum
    of
     the value of the MPD@availabilityStartTime,
     the PeriodStart time of the containing Period as defined in 5.3.2.1,
     the MPD start time of the Media Segment, and
     the MPD duration of the Media Segment.

    This makes segment availability start time invalid after short period of time after live session start

  2. #2
    Join Date
    Jun 2011
    Posts
    1,037

    Default

    Hi,
    The availabilityStartTime requirement is actually new in Version 2 of the DASH spec, which we do not support as of yet.
    Our initial implementation worked with the previous versions of the players we had available.
    We are planning to update our DASH implementation based on the latest spec and latest dash.js player.
    Not sure when that will be though, but it is coming.

    Daren

  3. #3

    Default

    Daren,
    thanks a lot ! It makes sense now.

  4. #4

    Default

    Daren,

    Is there an updated timeline on when this issue might be fixed?

    Thanks,
    --Thomas

  5. #5
    Join Date
    Jun 2011
    Posts
    1,037

    Default

    Hi
    There isn't a update for this yet. No time line at the moment.

    Daren

  6. #6

    Default

    Daren,

    Thanks for getting back to me. Is there a version of Dash.js known to work with the latest Wowza Streaming Engine?

    Thanks,
    --Thomas

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