Abstract: A system includes a video advertisements control unit to enable serving of a video advertisement to a mobile electronic device. A tag sending unit sends a unique tag to multiple advertising supply side servers. A mobile video player loader unit automatically loads a mobile video player upon parsing of the unique tag. Waterfall loader unit automatically loads, concurrently, a unique waterfall data structure including a prioritized list of advertising demand-side resources. An advertiser selector unit analyzes the prioritized list, and selects a particular advertiser which offers to pay a maximum price for a video advertising impression relative to other advertisers on said prioritized list. A video advertisement reconstruction unit converts or reconstructs the video, as a sprite-sheet or as a set of discrete images. A player starter unit automatically triggers operation of a mobile video player that was loaded onto the mobile electronic device, to playback a reconstructed video item.