Shaka Player is displaying only one audio channel information even if manifest has Stereo + Dolby 5.1 + Dolby Atmos

[subhrakdas]

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

yes.

What version of Shaka Player are you using?

Version 2.5

Can you reproduce the issue with our latest release version?

yes, we can reproduce.

Can you reproduce the issue with the latest code from main?

yes, we can reproduce.

Are you using the demo app or your own custom app?

we are using our custom app.

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

yes, reproducible on demo application as well.

What browser and OS are you using?

LG WebOS / Chromium Browser

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

Model Number: LG Smart TV 32LM563BPTC
Firmware Version: 4.9.1-54309 (goldilocks2-gyeryongsan)

What are the manifest and license server URIs?

Manifest URL: https://d1k754bfxym1vm.cloudfront.net/VOD/india_art_demo/stream.mpd

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

{
   "drm":{
      "retryParameters":{
         "maxAttempts":2,
         "baseDelay":1000,
         "backoffFactor":2,
         "fuzzFactor":0.5,
         "timeout":0
      },
      "delayLicenseRequestUntilPlayed":false,
      "fairPlayTransform":true
   },
   "manifest":{
      "retryParameters":{
         "maxAttempts":8,
         "baseDelay":1000,
         "backoffFactor":2,
         "fuzzFactor":0.5,
         "timeout":0
      },
      "availabilityWindowOverride":null,
      "customFilter":{
         "filterEnable":true
      },
      "disableAudio":false,
      "disableVideo":false,
      "disableText":false,
      "forcePartialSegmentRequest":false,
      "dash":{
         "clockSyncUri":"https://time.akamai.com/",
         "ignoreDrmInfo":false,
         "xlinkFailGracefully":false,
         "defaultPresentationDelay":10,
         "ignoreMinBufferTime":true,
         "ignoreEssentialProperty":true,
         "autoCorrectDrift":true,
         "ignoreSuggestedPresentationDelay":false,
         "ignoreEmptyAdaptationSet":false
      },
      "hls":{
         "ignoreTextStreamFailures":false
      }
   },
   "streaming":{
      "retryParameters":{
         "maxAttempts":8,
         "baseDelay":1000,
         "backoffFactor":2,
         "fuzzFactor":0.5,
         "timeout":0
      },
      "rebufferingGoal":3,
      "bufferingGoal":30,
      "bufferBehind":15,
      "ignoreTextStreamFailures":true,
      "alwaysStreamText":false,
      "startAtSegmentBoundary":false,
      "smallGapLimit":1,
      "jumpLargeGaps":true,
      "durationBackoff":1,
      "forceTransmuxTS":false,
      "sourceBufferOffset":0,
      "separateAVBuffers":true,
      "safeSeekOffset":5,
      "stallEnabled":true,
      "stallThreshold":3,
      "stallBackoffFactor":1.25,
      "stallBackoffCount":3,
      "bufferChangeWindow":5,
      "preferNativeHls":false
   },
   "errorRecovery":{
      "recoverableErrorCodes":[
         
      ],
      "blackListCooldownPeriod":30,
      "permanentBlacklistThreshold":null
   },
   "offline":{
      "usePersistentLicense":true
   },
   "preferredAudioLanguage":"",
   "preferredTextLanguage":"",
   "preferredVariantRole":"",
   "preferredTextRole":"",
   "preferredAudioChannelCount":6,
   "restrictions":{
      "minWidth":0,
      "maxWidth":null,
      "minHeight":0,
      "maxHeight":null,
      "minPixels":0,
      "maxPixels":null,
      "minFrameRate":0,
      "maxFrameRate":null,
      "minBandwidth":0,
      "maxBandwidth":null
   },
   "playRangeStart":0,
   "playRangeEnd":null
}

What did you do?

We are trying to play Dolby 5.1 and Dolby Atmos content on supported TV devices after detecting device capabilities.

What did you expect to happen?

Shaka Player should list Dolby 5.1 and Dolby Atmos both audios and based of user's input switching between both should be possible, since both Dolby 5.1 and Dolby Atmos uses same number of channel counts.

What actually happened?

Shaka is only displaying one audio channel which is Dolby 5.1 even manifest has Dolby Atmos. We understood that Shaka uses preferredAudioChannelCount to filter out codecs but since 5.1 and Atmos both has similar number of channels we are expecting
both audio channels to be present there.

[avelad]

It seems that the DASH parser does the following: https://github.com/shaka-project/shaka-player/blob/main/lib/dash/dash_parser.js#L1220-L1234

In you manifest you have:

• Stereo with codecs="mp4a.40.2"
• Dolby with codecs="ec-3"
• Doby Atmos with codecs="ec-3" and <SupplementalProperty schemeIdUri="tag:dolby.com,2018:dash:EC3_ExtensionType:2018" value="JOC"/>

Until this is implemented codecs cannot be changed during the playback: #1528

Besides, a conversion is made for those with JOC and the audio/ec-3 format is changed to audio/eac3-joc

Is this wrong for you?

[subhrakdas]

I understood that during playback Codec switching is not possible, but is there any preferences we can set for Atmos, when 5.1 and Atmos both are present in a single manifest, as currently 5.1 only being played.

[avelad]

According to https://developerkb.dolby.com/support/solutions/articles/16000067758-what-is-dolby-digital-plus-joc-joint-object-coding-

I think that what is being done in the parser is wrong, besides that in HLS it is not done. I will send a PR throughout the day to correct this.

Thank you!