Viewer Experience of Incorrectly Synchronized AV-sync
The result typically leaves a filmed or televised character moving his or her mouth when there is no spoken dialog to accompany it, hence the term "lip flap" or "lip-sync error". The resulting audio video sync error can be annoying to the viewer and can even lead to the viewer's not enjoying the program, to the program's not being effective, and to the speakers being perceived negatively. The lack of effectiveness problems are of particular concern when product commercials and political candidates are viewed. Television industry standards organizations, such as the Advanced Television Systems Committee, have become involved in setting standards for audio video sync errors.
Because of these annoyances, AV-sync error is of concern to the television programming industry, including television stations, networks, advertisers and program production companies. Unfortunately the advent of high definition flat panel display technologies (LCD, DLP and plasma) which can delay video more than audio have moved the problem into the viewer's home and beyond control of the television programming industry alone. Consumer products companies now offer audio delay adjustments to compensate for video delay changes in TV's, a/v receivers, and several companies manufacture dedicated digital audio delays made exclusively for lip-sync error correction.
Read more about this topic: Audio To Video Synchronization
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