Recording a video and making a video call on your phone are two very different things. In order for someone on the other side of the globe to see and hear you in a video, the video has to be compressed and encrypted first. What this means is that quality loss can't be prevented when videos are sent from one device to another.
Events and Moments videos work the same way.
Additionally, other factors like device model, lighting condition, and connection speed may all influence the quality of the video.
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