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  • Category: Software & Apps

    How audio and video are merged?


    Have you ever been curious about how the audio and the video get merged in a recording? Our technical experts can abridge you with the most authentic explanation.

    When a singer sings a song, his video and audio both are recorded. As these are the two different inputs of recording one is video and other is audio, it is likely that there may be some time difference between the two and if not corrected or synchronized the lip movement may not match with the song.

    What is the method or software by which these two are merged with each other and well synchronized? Is it done by the electronic circuitry itself or some application in the system?
  • #12746
    What you call as the Audio-Video merge is generally termed as Audio-to-video synchronization, lip sync or audio-video sync. It refers to a relative timing of an audio or sound and its related video or image in parts during its creation, its post-production mix, during its transmission, its reception and while it is play-back processing. It is generally referred as a time when both the sound and the video are having a time-related cause and effect relationship.

    The AV-sync can create an issue in broadcasting a program on television, while video conferencing, or even in a film.
    The Digital or analog audio video streaming or those video files usually contain a type of explicit AV-sync timing, either in the shape of an interleaved video and audio data or it can be done as an explicit relative time-stamping of data. The processing of a particular data has to follow the relative data timing by either taking action like stretching between or creating an interpolation of the data it has received. If this processing of data does not follow the time, then the AV-sync error takes place. It will then increase in whenever data it loses because of the transmission errors or due to the missed timed processing.


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