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Captioning - CEA 608 - Calculation of caption position and size is not always correct

Created by: epiclabsDASH

Environment

The MPD passes the DASH-IF Conformance Tool on http://dashif.org/conformance.html
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: https://vm2.dashif.org/livesim/testpic_2s/cea608_and_segs.mpd
Dash.js version: Nightly build
Browser name/version: Chrome/Firefox
OS name/version: Mac

Steps to reproduce

Open given stream in nightly build version of the player
Repeat the operation until error is reproduced (here, I get reproducing the issue around 10% of cases)

Observed behaviour

Size and position of captions are wrong calculated. They are wrongly placed at x: 0 and its size is bigger than expected.

This is not happening neither in 2.6.0 nor in 2.5.0.

Reported by Chuck Wilson in Slack Channel