2.5 Master -- Playback skips first period of VOD asset

[TheJohnBowers]

Have you read the FAQ and checked for duplicate open issues?:
Yes, I don't see anything. I hope I haven't missed something.
What version of Shaka Player are you using?:
2.5 Master
Can you reproduce the issue with our latest release version?:
No
Can you reproduce the issue with the latest code from master?:
Yes
Are you using the demo app or your own custom app?:
Demo App
If custom app, can you reproduce the issue using our demo app?:
NA
What browser and OS are you using?:
Chrome macos
What are the manifest and license server URIs?:
https://content.downlynk.com/88ec75470b1a48efbe943986c4517be2.mpd?ad=superbowl&prettydash=1
https://content.downlynk.com/wv
What did you do?
Playback from 2.4.x and earlier does not skip the first period. Playback from master updated yesterday does skip the first period. Nothing interesting or informative is logged in the console.
What did you expect to happen?
Not skipping the first period.
What actually happened?
First Period was skipped.

[michellezhuogg]

Found that Latest nightly build skips the first period while v2.4.4 doesn't. Will work on fixing this.

[vaage]

I only just started looking into this...

My high-level findings so far:

• The difference between 2.4 and 2.5 is in what Playhead is saying our start time is.

Low-level findings:

• Playhead gets the start time from PresentationTimeline
• PresentationTimeline determines the start time from minSegmentStartTime_
• minSegmentStartTime_ which is updated from notifySegments
• notifySegments is called via SegmentList/SegmentTemplate/SegmentBase by DashParser

A more accurate problem statement:

• SegmentTemplate is not updating minSegmentStartTime_ when the segments have a known duration

I will sync-up with the Shaka Player team internally to determine next steps.

[joeyparrish]

Fix released in v2.5.0-beta2.