In this way, it will be possible to synchronize audio tracks and video streams with other users and create a joint virtual movie watching session. The audio and video played on the user’s device during the video call can be heard and seen by other participants.
Currently, this is a test version available to users who download the beta version from Google Play. But as stated on the WABetaInfo portal, the new functionality will soon be available to all users.
Source: Ferra

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