DASH live stream broken with presentationTimeOffset

[randeeppr]

Hi,

We are trying to play a unencrypted dash live stream from envivio encoder but we are getting assertion failed errors.

mpd is as follows.

<MPD xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"     xmlns="urn:mpeg:dash:schema:mpd:2011" xsi:schemaLocation="urn:mpeg:dash:schema:mpd:2011     DASH-MPD.xsd" type="dynamic" minimumUpdatePeriod="PT10.000S" minBufferTime="PT5.000S"     maxSegmentDuration="PT10.080S" availabilityStartTime="2015-08-01T15:24:12Z"     timeShiftBufferDepth="PT60.000S" profiles="urn:mpeg:dash:profile:isoff-live:2011">
<Period id="0" start="PT0S">
<AdaptationSet mimeType="video/mp4" segmentAlignment="true" startWithSAP="1"     maxWidth="720" maxHeight="576" maxFrameRate="25" par="16:9">
<SegmentTemplate timescale="90000" initialization="$RepresentationID$/Header.m4s" media="$RepresentationID$/$Time$.m4s" presentationTimeOffset="676091987">
<SegmentTimeline>
<S t="676099187" d="900000" r="5"/>
</SegmentTimeline>
</SegmentTemplate>
<Representation id="video1" width="720" height="576" frameRate="25" sar="64:45" scanType="progressive" bandwidth="1500000" codecs="avc1.64001E"/>
</AdaptationSet>
<AdaptationSet mimeType="audio/mp4" lang="en" segmentAlignment="true" startWithSAP="1">
<SegmentTemplate timescale="90000" initialization="$RepresentationID$/Header.m4s" media="$RepresentationID$/$Time$.m4s" presentationTimeOffset="676091987">
<SegmentTimeline>
<S t="676100881" d="898560"/>
<S t="676999441" d="904320"/>
<S t="677903761" d="898560" r="2"/>
<S t="680599441" d="904320"/>
</SegmentTimeline>
</SegmentTemplate>
<Representation id="audio1" audioSamplingRate="16000" bandwidth="96000" codecs="mp4a.40.2">
<AudioChannelConfiguration schemeIdUri="urn:mpeg:dash:23003:3:audio_channel_configuration:2011" value="2"/>
</Representation>
</AdaptationSet>
</Period>
</MPD>

And we are getting the following error on the shaka player.

• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 765.0079998970032 latestAvailableSegmentEndTime 5179.632011111111
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 765.0079998970032 latestAvailableSegmentEndTime 5179.573188888889
  Starting each stream from 5164.593189108234
  Timestamp correction -5119.493188111111
  Assertion failed:
  video.currentTime (45.100000888889554) should be within the stream limits {"start":5119.94301121983,"end":5119.94301121983}
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 766.0079998970032 latestAvailableSegmentEndTime 5179.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 766.0079998970032 latestAvailableSegmentEndTime 5179.632011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Player error CustomEvent {detail: Error: The browser failed to decode the media content.
  at shaka.player.Player.onError_ (http://1…, srcElement: null, target: s…a.p…r.Player, currentTarget: s…a.p…r.Player}bubbles: truecancelBubble: falsecancelable: falsecurrentTarget: shaka.player.PlayerdefaultPrevented: falsedetail: Error: The browser failed to decode the media content.
  at shaka.player.Player.onError_ (http://172.16.0.6/shaka-player-master/lib/player/player.js:403:15)eventPhase: 0path: Array[0]returnValue: truesrcElement: nulltarget: shaka.player.PlayertimeStamp: 1438440908170type: "error"proto: CustomEvent
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 776.0039999485016 latestAvailableSegmentEndTime 5189.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 776.0039999485016 latestAvailableSegmentEndTime 5189.616011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 786.0039999485016 latestAvailableSegmentEndTime 5199.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 786.0039999485016 latestAvailableSegmentEndTime 5199.600011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 796.0039999485016 latestAvailableSegmentEndTime 5209.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 796.0039999485016 latestAvailableSegmentEndTime 5209.584011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 806.0039999485016 latestAvailableSegmentEndTime 5219.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 806.0039999485016 latestAvailableSegmentEndTime 5219.632011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 816.0079998970032 latestAvailableSegmentEndTime 5229.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 816.0079998970032 latestAvailableSegmentEndTime 5229.616011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 826.0039999485016 latestAvailableSegmentEndTime 5239.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 826.0039999485016 latestAvailableSegmentEndTime 5239.600011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 836.0090000629425 latestAvailableSegmentEndTime 5249.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 836.0090000629425 latestAvailableSegmentEndTime 5249.584011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 846.0039999485016 latestAvailableSegmentEndTime 5259.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 846.0039999485016 latestAvailableSegmentEndTime 5259.632011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 856.0039999485016 latestAvailableSegmentEndTime 5269.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 856.0039999485016 latestAvailableSegmentEndTime 5269.616011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:
  Updating manifest...
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 866 latestAvailableSegmentEndTime 5279.573188888889
  @availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 866 latestAvailableSegmentEndTime 5279.600011111111
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Updated SegmentIndex 2: 0 -> 6 SegmentReference(s).
  Updated SegmentIndex 3: 0 -> 6 SegmentReference(s).
• video/mp4; codecs="avc1.64001E" is supported
• audio/mp4; codecs="mp4a.40.2" is supported
  Manifest updated!
  Assertion failed:

Http headers are given below.

curl -I http://172.16.0.11/dash/test1/manifest.mpd
HTTP/1.1 200 OK
Content-Length: 0
Server: Halo Origin Server
Content-Type: text/xml
Access-Control-Allow-Origin: *
Access-Control-Allow-Headers: Origin,Content-Type,Access-Control-Allow-Origin,Range,Accept
Access-Control-Expose-Headers: Access-Control-Allow-Origin, Content-Length, Content-Type, Date, Range, Server, Transfer-Encoding
Access-Control-Allow-Methods: GET,POST,PUT,DELETE,OPTIONS
Date: Sat, 01 Aug 2015 15:37:07 GMT
Connection: keep-alive

Do we need to change anything?

Regards,
Randeep

[randeeppr]

Looks like its the issue with time. its either trying to play from the past or from future. Can someone help me identifying this.

[randeeppr]

What does this actually says

@availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 3876.003000020981 latestAvailableSegmentEndTime 16023.052288888888
@availabilityStartTime seems to be inaccurate; some segments may not be available yet: currentPresentationTime 3876.003000020981 latestAvailableSegmentEndTime 16023.104544444444

Is the player trying to play the segments which is not generated yet? or the ones which were too old?

[tdrews]

Thanks for the report we'll take a look.

[tdrews]

I believe there may be an issue with how the player handles the presentationTimeOffset attribute for live content with SegmentTemplate + SegmentTimeline.

• Does the content playback in 1.3.x?
• Are you able to host any content that uses presentationTimeOffset to a public location?

[joeyparrish]

@randeeppr We are still waiting for your feedback on this.

• Is this still an issue for you?
• Does the content play in 1.3.x?
• Are you able to share sample content with us that triggers this bug for you? If not publicly, then a private email will suffice.

[randeeppr]

Hi Joey,
It is solved. We were using Envivio encoder for the live stream. Envivio support has changed something and its working now.

Thank you.

[joeyparrish]

We have found that we do, in fact, have a bug in Shaka Player around our handling of presentationTimeOffset, specifically for live streams. I've updated the tags and title to reflect this, and I'm reopening the issue until we can publish a fix.