com.widevine.alpha.experiment key system setup

[Jason239]

Have you read the Tutorials?
yes

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

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

not related

What version of Shaka Player are you using?
4.6.2

What browser and OS are you using?
Windows 11 / Chrome

Please ask your question

I'm trying to do a Widevine L1 playback test, but when I set the key system as below in Shaka player, I get a 6012 error. If set it to the com.widevine.alpha key system, it work fine.
Internally, the com.widevine.alpha.experiment key system doesn't seem to be working, is it because it's an experimental key system and is prevented from being used?

playerConfig = {
                drm: {
                    servers: {
                        'com.widevine.alpha.experiment': licenseUri
                        
                    },
                    advanced: {
                        'com.widevine.alpha.experiment': {
                            'distinctiveIdentifierRequired': false,
                            'persistentStateRequired': true,
                            videoRobustness: 'HW_SECURE_ALL',
                            audioRobustness: 'HW_SECURE_CRYPTO'
                        }
                    }
                },
                streaming: {
                    autoLowLatencyMode: true,
                },
            };

[avelad]

To use com.widevine.alpha.experiment you have to use the following config:

playerConfig = {
    drm: {
        servers: {
            'com.widevine.alpha': licenseUri
            
        },
        advanced: {
            'com.widevine.alpha': {
                'distinctiveIdentifierRequired': true,
                'persistentStateRequired': true,
                videoRobustness: 'HW_SECURE_ALL',
                audioRobustness: 'HW_SECURE_CRYPTO'
            }
        },
        keySystemsMapping: {
            'com.widevine.alpha': 'com.widevine.alpha.experiment'
        }
    },
    streaming: {
        autoLowLatencyMode: true,
    },
};

[Jason239]

I also tried using keySystemsMapping.
Once I put only keySystemsMapping, when I call player.load, I get error TypeError: undefined is not iterable (cannot read property Symbol(Symbol.iterator)) so if I add preferredKeySystems like below, I get 6002 error.

playerConfig = {
                drm: {
                    servers: {
                        'com.widevine.alpha': licenseUri,
                    },
                    advanced: {
                        'com.widevine.alpha': {
                            'distinctiveIdentifierRequired': false,
                            'persistentStateRequired': true,
                            videoRobustness: 'HW_SECURE_ALL',
                            audioRobustness: 'HW_SECURE_CRYPTO'
                        }
                    },
                    preferredKeySystems: [
                        'com.widevine.alpha.experiment',
                        'com.widevine.alpha'
                    ],
                    keySystemsMapping: {
                        'com.widevine.alpha': 'com.widevine.alpha.experiment'
                    }
                },
                streaming: {
                    autoLowLatencyMode: true,
                },
            };

Even in this case, error.data[0] contains undefined is not iterable (cannot read property Symbol(Symbol.iterator)) error message.
Adding com.widevine.alpha.experiment to advanced results in the same error.

[avelad]

I think that you need use distinctiveIdentifierRequired = true to used Widevine L1 (https://github.com/StaZhu/enable-chromium-hevc-hardware-decoding?tab=readme-ov-file#requestmediakeysystemaccess)

[Jason239]

Oh, okay but the error code is still the same if I modify that value.
If I implement the player myself by configuring the key system to call the EME API directly as shown below in my browser, it works fine.

const config = [{
                    initDataTypes: ['cenc'],
                    audioCapabilities: [{
                        contentType: 'audio/mp4;codecs="mp4a.40.2"',
                        robustness: 'HW_SECURE_CRYPTO'
                    }],
                    videoCapabilities: [{
                        contentType: 'video/mp4;codecs="avc1.640028"',
                        robustness: 'HW_SECURE_ALL'
                    }],
                    persistentState: 'required',
                }];

                let keySystem;
                try {
                    keySystem = await navigator.requestMediaKeySystemAccess('com.widevine.alpha.experiment', config);
                } catch (error) {
                    logger('Failed to get access for com.widevine.alpha.experiment');
                }

Is there anything else wrong with my Shaka player setup? I don't understand the error message undefined is not iterable.
I'm getting the same error if I compile and use latest source including added in #7627

[aykut-33]

I am getting the same error. Any updates?

[avelad]

I found a error in the code... I'll create a PR to fix it very soon!

[MarianoFacundoArch]

@aykut-33 @Jason239 Did you do any modification at a widevine licence delivery level? Did you have to deliver with a PlayReady Licence? Or should it work out of the box with a Widevine licence?