<p>The media capabilities of an attendee: audio, video, or content.</p> <note> <p>You use the capabilities with a set of values that control what the capabilities can do, such as <code>SendReceive</code> data. For more information, refer to and .</p> </note> <p>When using capabilities, be aware of these corner cases:</p> <ul> <li> <p>If you specify <code>MeetingFeatures:Video:MaxResolution:None</code> when you create a meeting, all API requests that include <code>SendReceive</code>, <code>Send</code>, or <code>Receive</code> for <code>AttendeeCapabilities:Video</code> will be rejected with <code>ValidationError 400</code>.</p> </li> <li> <p>If you specify <code>MeetingFeatures:Content:MaxResolution:None</code> when you create a meeting, all API requests that include <code>SendReceive</code>, <code>Send</code>, or <code>Receive</code> for <code>AttendeeCapabilities:Content</code> will be rejected with <code>ValidationError 400</code>.</p> </li> <li> <p>You can't set <code>content</code> capabilities to <code>SendReceive</code> or <code>Receive</code> unless you also set <code>video</code> capabilities to <code>SendReceive</code> or <code>Receive</code>. If you don't set the <code>video</code> capability to receive, the response will contain an HTTP 400 Bad Request status code. However, you can set your <code>video</code> capability to receive and you set your <code>content</code> capability to not receive.</p> </li> <li> <p>If meeting features is defined as <code>Video:MaxResolution:None</code> but <code>Content:MaxResolution</code> is defined as something other than <code>None</code> and attendee capabilities are not defined in the API request, then the default attendee video capability is set to <code>Receive</code> and attendee content capability is set to <code>SendReceive</code>. This is because content <code>SendReceive</code> requires video to be at least <code>Receive</code>.</p> </li> <li> <p>When you change an <code>audio</code> capability from <code>None</code> or <code>Receive</code> to <code>Send</code> or <code>SendReceive</code> , and an attendee unmutes their microphone, audio flows from the attendee to the other meeting participants.</p> </li> <li> <p>When you change a <code>video</code> or <code>content</code> capability from <code>None</code> or <code>Receive</code> to <code>Send</code> or <code>SendReceive</code> , and the attendee turns on their video or content streams, remote attendees can receive those streams, but only after media renegotiation between the client and the Amazon Chime back-end server.</p> </li> </ul>