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I was pleasantly surprised to find this type of video editing services at these reasonable prices, as I had been told by a friend in the television industry that they either didn’t exist or would be extremely costly. The communication with Digital Improvements from my initial inquiry to the final deliverable was always prompt and professional. In industry terminology the lip sync error is expressed as an amount of time the audio departs from perfect synchronization with the video where a positive time number indicates the audio leads the video and a negative number indicates the audio lags the video. Digital or analog audio video streams or video files usually contain some sort of synchronization mechanism, either in the form of interleaved video and audio data or by explicit relative timestamping of data. The processing of data must respect the relative data timing by e.
The AV-sync delay is normally fixed. External AV-sync error: If a microphone is placed far away from the sound source, the audio will be out of sync because the speed of sound is much lower than the speed of light. If the sound source is 340 meters from the microphone, then the sound arrives approximately 1 second later than the light. The AV-sync delay increases with distance. During mixing of video clips normally either the audio or video needs to be delayed so they are synchronized.
The AV-sync delay is static, but can vary with the individual clip. A video camera with built-in microphones or line-in may not delay sound and video paths by the same number of milliseconds. A video camera should have some sort of explicit AV-sync timing put into the video and audio streams. The AV-sync delay normally increases with time.
Particular video signal processing circuitry which is widely used and contributes significant video delays include frame synchronizers, digital video effects processors, video noise reduction, format converters and compression systems. The video monitor processing circuit may delay the video stream. Pixelated displays require video format conversion and deinterlace processing which can add one or more frames of video delay. A video monitor with built-in speakers or line-out may not delay sound and video paths by the same number of milliseconds. Some video monitors contain internal user-adjustable audio delays to aid in correction of errors. Some transmission protocols like RTP require an out-of-band method for synchronizing media streams. In RTP’s case, each media stream has its own timestamp using an independent clock rate and per-stream randomized starting value.
In film movies these timing errors are most commonly caused by worn films skipping over the movie projector sprockets because the film has torn sprocket holes. Errors can also be caused by the projectionist misthreading the film in the projector, although this is rare with competent projectionists. Audio to Video Synchronization is commonly corrected and maintained with an audio synchronizer. Television industry standards organizations have established acceptable amounts of audio and video timing error and suggested practices related to maintaining acceptable timing. In the television field, audio video sync problems are commonly caused when significant amounts of video processing is performed on the video part of the television program.
Typical sources of significant video delays in the television field include video synchronizers and video compression encoders and decoders. Particularly troublesome encoders and decoders are used in MPEG compression systems utilized for broadcasting digital television and storing television programs on consumer and professional recording and playback devices. 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 may even cause the viewer to not enjoy the program, decrease the effectiveness of the program or lead to a negative perception of the speaker on the part of the viewer. Because of these annoyances, AV-sync error is a concern to the television programming industry, including television stations, networks, advertisers and program production companies. For television applications, the Advanced Television Systems Committee recommends that audio should lead video by no more than 15 milliseconds and audio should lag video by no more than 45 milliseconds.