Microsoft Stream: Comment on a video or audio file in SharePoint and OneDrive
OneDrive for Business, SharePoint Online, Stream, SharePoint Development
From Microsoft Corporation
Technical Bulletin MC317765 · Published Jan 25, 2022
Message Summary
This feature allows you to have threaded conversations on a video or audio filed saved in OneDrive for Business or SharePoint Online through a cohesive and familiar commenting experienced like the one used in Word, Excel, and PowerPoint.
This message is associated with Microsoft 365 Roadmap ID 88521.
When this will happen:
We expect this to begin rolling out for general availability in early February and expect that rollout to be completed by late February.
We expect this to begin rolling out to GCC, GCC-H and DoD in early March and we expect that rollout to be complete by mid-March.
How this will affect your organization:
Users will see a Comments button in the upper right-hand corner of any video or audio file stored in OneDrive for Business or SharePoint Online.
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Selecting this button expands a panel where users will be able to have threaded conversations through comments, for which file owners have full edit permissions over. 
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NOTE: The backend used for this feature is the same as the existing backend for comments found in the details pane of some files saved in OneDrive for Business and SharePoint Online:
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What you need to do to prepare:
You might want to notify your users so that they can leverage this feature. This feature can be disabled by editors and owners in a per-file basis through the Video Settings button above Comments depicted in the first image.
There is also an existing tenant level setting to disable comments altogether (see “CommentsOnFilesDisabled”). Due to the shared backend, this setting will disable both commenting features. Viewers without edit access have been given permission to add comments on both commenting options in video and audio files as they are usually meant to be consumed by viewers without edit access. However, we provide a SharePoint Online PowerShell command to change the behavior so that only viewers with edit access can comment: “ViewersCanCommentOnMediaDisabled”. This is being added to the same documentation linked above.
