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[Hls-interest] Availability Duration of Partial Segments

Vijay Jayaraman <Vijay.Jayaraman@wowza.com> Thu, 15 April 2021 15:22 UTC

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From: Vijay Jayaraman <Vijay.Jayaraman@wowza.com>
To: "Hls-interest@ietf.org" <Hls-interest@ietf.org>
Thread-Topic: Availability Duration of Partial Segments
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Date: Thu, 15 Apr 2021 15:21:56 +0000
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Subject: [Hls-interest] Availability Duration of Partial Segments
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Hi All,

I have a question related to LLHLS ( 6.2.2. Live Playlists - https://tools.ietf.org/html/draft-pantos-hls-rfc8216bis-07#section-6.2.2 )

The spec states the following about part *tags* in the playlist.

EXT-X-PART tags SHOULD be removed from the Playlist after they are

   greater than three Target Durations from the end of the Playlist.

The spec states the following about the availability duration of media *segments*.
The Availability Duration of a Media Segment is the duration of the
   segment plus the duration of the longest-duration Playlist
   distributed by the server containing that segment.  If the server
   removes a Media Segment URI from a Playlist that contains an EXT-
   X-ENDLIST tag, clients MUST be able to download the corresponding
   Media Segment until the time of removal plus the segment's
   Availability Duration.

I couldn’t find specific information on the Availability Duration of *Partial Segments*.

  1.  When not using BYTERANGE for partial segments, what is the Availability duration of the partial segments?
  2.  When using BYTERANGE for partial segments, does the Availability Duration of Media Segments apply to Partial Segments as well?

Thanks,
-Vijay

Vijay Jayaraman
Staff Software Engineer
Wowza Media Systems | The solution you start with, the partner you scale with.
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