6010: ENCRYPTED_CONTENT_WITHOUT_DRM_INFO on Comcast X1 Due to Safari Blocklist on Shaka 4.6.5

[Vasanthavanan-Devarajan]

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

If the problem is related to FairPlay, have you read the tutorial?
No it's not related to Fairplay DRM

What version of Shaka Player are you using?
4.6.5

Can you reproduce the issue with our latest release version?
Yes it's even reproduced with 4.7.0

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

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

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

What browser and OS are you using?
Device has Safari Version 8

For embedded devices (smart TVs, etc.), what model and firmware version are you using?
Comcast X1 infinity Setup Box

What are the manifest and license server URIs?
NA

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

What did you do?

Started (DASH+Widevine) Stream on the Comcast device, getting 6010 - ENCRYPTED_CONTENT_WITHOUT_DRM_INFO

What did you expect to happen?
Playback has to work without any issues.

What actually happened?

In our production environment, we're currently utilizing Shaka Player version 4.3.7 and are in the process of upgrading to version 4.6.5. However, we've encountered a playback issue specific to the Comcast X1 Infinity set-top box.

Upon investigating, we discovered that the media source support in Shaka Player is unexpectedly marked as null. This issue seems to stem from a recent change in Shaka Player's handling of Safari browser versions
(refer to PR: #5752).

Shaka Player now blocklists Safari versions below 10. The User Agent for Comcast's setup, which is
Mozilla/5.0 (Linux; x86_64 GNU/Linux) AppleWebKit/601.1 (KHTML, like Gecko) Version/8.0 Safari/601.1 WPE, is being identified as an older Safari version (Safari 8), leading to the media source being set to null. This, in turn, triggers the player to incorrectly handle srcEquals, resulting in the ENCRYPTED_CONTENT_WITHOUT_DRM_INFO error.

The relevant code references are:

Media Source Polyfill: Shaka Player Media Source Polyfill
Platform Utilities: Shaka Player Platform Utilities
For further context, here are older PRs related to this issue:

PR #2798
PR #2801
We have developed a fix for this issue on our end, confirming successful playback. We plan to submit a PR with our solution.

[Vasanthavanan-Devarajan]

PR has been raised for the above: #6034.
CC: @avelad @joeyparrish

[avelad]

Fixed with #6034