Abstract: An audio-video system and method employs a dual-control interface for directly controlling the play speed of a video track while switching among a plurality of audio tracks independently of the video. The dual-control interface enables the user to adjust the play speed of the video track to match or synchronize with the tempo of a selected audio track at any point in time. The video speed and audio selection commands can be recorded as a file or on disk along with the underlying video and audio resources for playback or editing on PCs or game consoles. An Internet-enabled version can connect to streaming audio and/or video resources from Internet websites, for play on wireless mobile devices or Internet browsers. An Auto Beat feature may be used to automatically detect the beat of a currently selected audio track and convert it to the video track play speed.

Abstract: An audio-visual system and method employs a dual-control interface for directly controlling the video speed of an underlying video resource for video output, and for switching among any of a plurality of audio resources at different points in time independently of the video output. The video speed control allows a user to adjust the running speed of the video track to match or synchronize with the tempo or duration of a selected audio track at any point in time. The video speed and audio selection commands can be recorded and distributed on disk along with the audio-video application and underlying video and audio tracks. It can thus be operated for play on PCs or game consoles, or used as media for play on wireless mobile devices or Internet browsers. The audio-visual system is particularly suitable for making personally editable music video and/or playing video games, audience participation (karaoke) games, and the like.