Video sharing is described. In an embodiment, mobile video capture devices such as mobile telephones capture video streams of the same event. A video sharing system obtains contextual information about the video streams and uses that to form a video output from the streams, that output being for sharing by other entities. For example, the formed video provides an enhanced viewing experience as compared with an individual one of the input video streams. In embodiments the contextual information may be obtained from content analysis of the video streams, from stored context information and from control information such as device characteristics. In some embodiments the video streams of a live event are received and the output video formed in real time. In examples feedback is provided to video capture devices to suggest that the zoom, viewing position or other characteristics are adjusted or to achieve this automatically.