url specifies the url of the thumbnail. It is a required attribute.
height specifies the height of the thumbnail. It is an optional attribute.
width specifies the width of the thumbnail. It is an optional attribute.
time specifies the time offset in relation to the media object. Typically this is used when creating multiple keyframes within a single video. The format for this attribute should be in the DSM-CC's Normal Play Time (NTP) as used in RTSP [RFC 2326 3.6 Normal Play Time]. It is an optional attribute.
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