Choosing an audio track with fewer channels than `preferredAudioChannelCount` results in no audio on Firefox.

[oscnord]

Have you read the FAQ and checked for duplicate open issues? Yes

If the problem is related to FairPlay, have you read the tutorial?

What version of Shaka Player are you using?

Latest version (as of today) v4.10.1

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 app

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

What browser and OS are you using? Browser: Firefox v127.0.2 OS: macOS 14.5 (23F79)

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

What are the manifest and license server URIs?

Example setup: https://www.oscarnord.com/shaka-test/ Stream that is used in above example: https://storage.googleapis.com/shaka-demo-assets/tos-surround/dash.mpd

What configuration are you using? What is the output of player.getConfiguration()?

Default with the inclusion of:

{
  "preferredAudioChannelCount": 6
}

What did you do?

Start the player and choose a 2 channel audio track. In Chrome and Safari it works as expected but in Firefox audio segments are fetched but no audio is playing.

What did you expect to happen? Audio-tracks with channels < preferredAudioChannelCount should still be playable.

What actually happened?

No sound when selecting a 2 channel audio track. Switching back to the surround track however works and then audio playing.

Are you planning send a PR to fix it? Don't know if this is related to Shaka Player och if it's a bug in Firefox.

[avelad]

If you start with 6 channels, then change 2, the browser does not play the sound, if you then change to 6, the 6 channel does play. If you start with 2 channels, all other channel transitions work fine. This is a Firefox bug. Sorry!

[oscnord]

Thanks for the quick response @avelad I've created a ticket in Bugzilla. https://bugzilla.mozilla.org/show_bug.cgi?id=1906273

[shaka-bot]

Closing due to inactivity. If this is still an issue for you or if you have further questions, the OP can ask shaka-bot to reopen it by including @shaka-bot reopen in a comment.