Cannot force Chromium Edge to use Widevine with dash.js v3

[tomraut]

Steps to reproduce

1. Try to set only one licenseSystem in action:

var protectionData = {};
protectionData['com.widevine.alpha'] = { serverURL: widevineLicenseUrl, httpRequestHeaders: headers }

2. Start some DRM protected stream with Chromium Edge & Windows 10. Manifest file should include both Widevine and PlayReady ContentProtection elements.

Observed behaviour

dash.js logs that it selects PlayReady as key system and won't start playback

There is a workaround for this issue and it is including "priority" attribute to protectionData like this:

protectionData['com.widevine.alpha'] = { serverURL: widevineLicenseUrl, httpRequestHeaders: headers, priority: 0 }

Note that with dash.js 2.9.3 same worked without having to include "priority" but apparently some changes made in #2953 broke this. I think this should work also without having to include "priority" in cases where there is only one key system provided in protectionData.

[tomraut]

@dsilhavy here you go :)

[dsilhavy]

Hi @tomraut ,
I have not had the chance to test it in Chromium Edge but in my opinion the behavior of dash.js is correct. The protection data you hand over from the application to the player is used to extend or replace attributes like DRM request headers and license servers. However, the main source of information is still the data coming from the MPD or the PSSH.

As an example: Since the server url for Widevine is not included in the init data it is necessary to set this information when calling the player. For Playready the server url is part of the init data which is why we do not need to hand over server information to the player.

dash.js will use the first DRM system for which the requestMediaKeySystemAccess promise is succesfully resolved. This seems to be Playready in this case. In order to change DRM priorities you can use the priority attribute as you did in your example.

[tomraut]

Fair enough, let's keep current behaviour as it is. I'll fix our integration by adding priority attribute.