Subtitles remain on the screen while there is no dialogue - LG WebOS #8827
Description
Have you read the FAQ and checked for duplicate open issues?
Yes
If the problem is related to FairPlay, have you read the tutorial?
Not related
What version of Shaka Player are you using?
v4.3.4 (shaka-player.compiled.min.js)
Can you reproduce the issue with our latest release version?
Yes
Can you reproduce the issue with the latest code from main?
Yes
Are you using the demo app or your own custom app?
Custom
If custom app, can you reproduce the issue using our demo app?
Can't test it
What browser and OS are you using?
LG WebOS
For embedded devices (smart TVs, etc.), what model and firmware version are you using?
Smart TV: LG WebOS 7+ (2022 and newer models)
WebOS OS Version: 7.3.0 and up (tested on multiple LG 2022 TVs)
What are the manifest and license server URIs?
What configuration are you using? What is the output of player.getNonDefaultConfiguration()?
What did you do?
I'm using Shaka Player to play DASH content with external WebVTT subtitles.
Starting from version 4.3.4 and above, we noticed the following issue (only on LG TVs running WebOS 7+):
- When a subtitle cue ends, it does not disappear from the screen.
- The text remains visible until the next subtitle appears, regardless of the
endTimein the VTT file. - This causes ghost subtitles to stay on screen during silent scenes.
What did you expect to happen?
Subtitle cues should disappear when the end time is reached (as expected by the spec and as happens on other platforms).
What actually happened?
On LG TVs with WebOS 7+, subtitle cues remain visible after their end time, until a new subtitle is rendered.
This behavior does not occur on:
- LG WebOS 6.x (2021 models)
- Chrome, Firefox, other smart TVs
Are you planning to send a PR to fix it?
No