HLS (m3u8) out of sync

[roberto-sartori-gl]

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 to FairPlay.

What version of Shaka Player are you using? 4.10.9 (the demo website shows the issue)

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? Tried both.

If custom app, can you reproduce the issue using our demo app? Yes

What browser and OS are you using? Tested on Chrome/Chromium/Firefox on Windows and Linux.

For embedded devices (smart TVs, etc.), what model and firmware version are you using?

What are the manifest and license server URIs? An example (note that this is hosted by bitmovin and sometimes the URL doesn't work or the download speed is very low): https://cdn.bitmovin.com/content/assets/sintel/hls/playlist.m3u8

What configuration are you using? What is the output of player.getConfiguration()? The issue is present in the demo: https://shaka-player-demo.appspot.com/demo/#audiolang=en-US;textlang=en-US;uilang=en-US;asset=https://cdn.bitmovin.com/content/assets/sintel/hls/playlist.m3u8;panel=CUSTOM%20CONTENT;build=uncompiled

With subtitles enabled, it is possible to see that they don't match the audio (subtitles seem correct).

What did you do? I just opened the demo link.

What did you expect to happen? Video and audio should be synced.

What actually happened? Video and audio are not in sync.

Are you planning send a PR to fix it? I don't have a fix :)

Note: with other players, the issue is not present. I tested the JWPlayer demo and audio and video are in sync.