3.1.3: Seamless period transition issue in static MPD

[fabienvallee]

Environment

• The MPD passes the DASH-IF Conformance Tool on https://conformance.dashif.org/
• The stream has correct Access-Control-Allow-Origin headers (CORS)
• There are no network errors such as 404s in the browser console when trying to play the stream
• The issue observed is not mentioned on https://github.com/Dash-Industry-Forum/dash.js/wiki/FAQ
• The issue occurs in the latest reference client on http://reference.dashif.org/dash.js/ and not just on my page

• Link to playable MPD file:
• Dash.js version: 3.1.3
• Browser name/version: firefox/chromium
• OS name/version: linux

Seamless period transition seems to work quite well in the last release, this is really great!
However I face an issue with a static MPD.

Steps to reproduce

• Play a multiperiod static mpd ( not sure mine had anything special - there is a small gap at the end of the first period but I don't know if it's related).

Observed behaviour

• period transition is not seamless (no prebuffering, playback stops for buffering).
  Was seamless (w/ prebuffering) in previous versions.

Console output

The issue comes from the StreamController, in checkIfPrebufferingCanStart().
timelineConverter.calcSegmentAvailabilityRange always return invalid range.

dash.js/src/streaming/controllers/StreamController.js

Line 285 in 52301f5

const range = timelineConverter.calcSegmentAvailabilityRange(voRep, true);

I believe this is because the "dynamic" behavior is forced , it should be changed to:
timelineConverter.calcSegmentAvailabilityRange(voRep, adapter.getIsDynamic());

[fabienvallee]

Reproduced using the nightly ref player using

https://media.axprod.net/TestVectors/v7-Clear/Manifest_MultiPeriod_1080p.mpd

• seek to 11:00
• wait for period transition at 12:14 and check buffering graph

[dsilhavy]

Thanks for pointing this out, I have applied a fix for this: #3405

Would be great if you can check again in the nigthly build as soon as the fix is uploaded

[fabienvallee]

Tested nightly, looks good for me. Buffering not falling to 0s during period transition