How does AV Adjust work?

With AV Adjust you can correct the time offset between picture and sound by means of choosing and defining simultaneous points or segments in both video and audio tracks. Just mark them in any frame of the video track and assign the changes to be made to the audio track.

Your "tools" to do this are markers. The video track serves as the main time reference and remains unchanged while the sound by setting markers can be shifted in time, cut out, as well as "stretched" or "compressed" in some segments. In the latter case, the program interpolates the correction values of the picture/sound offset between the markers by means of a spline function, so that the playback speed does not change suddenly anywhere.

AV Adjust provides a total of four marker kinds:

 
Marker kind Description Function
Spline interpolation point Define a position in the video track where both the picture and sound are to be played at the same time.
Relative cut Change alignment between picture and audio track by a given value.
Double track shift Define a new picture/sound offset for the second ("double") audio track.
Sound track choice Select the sound track(s) to be used.

With these few functions all kinds of troubles with the synchronous run are history. Namely:

 
Constant offset: The sound comes too early or too late by an unchanging amount of time, i.e. the time difference between picture and sound remains constant.
Offset leap: The time offset between picture and sound changes suddenly, e.g. as a result of "lost" frames or sound segments while digitizing.
Speed difference: Gradual "drifting apart" of picture and sound, mostly caused by a faulty timing while recording.
Speed droops: Irregular variations of the picture/sound alignment.

As a result, you can either save your video with the corrected audio track, or only the audio data as an uncompressed WAV file. Because the video track is not changed by AV Adjust, the quicker and memory-effective WAV output is a better option when you plan to handing it over together with the original video stream, for example, to an MPEG encoder, or to a DVD authoring software.

AV Adjust comes with a detailed documentation which explains usage and possibilities illustrated in numerous examples. Of course, this documentation is also included in the free trial version. Furthermore, in the tutorial section you can find sample files which guide you through a practical introduction to working with AV Adjust and explain various ways of solution.


Features

  • Two audio tracks: In addition to the primary audio track you can use a second freely positionable sound track, which is called double audio track. This track is faded in whenever there are gaps in the primary audio track due to cuts. Besides, you can change between the two audio tracks by means of option markers.
  • Automatic crossfading: Changes between the primary and the secondary (double) audio tracks use a cross fade function by default with a duration of one video frame, no matter whether initiated by AV Adjust or by you (using option marker). Annoying "switch noises" are thereby out of question. A a result you get a cleanly cut sound.
  • Frame server support: The input engine of AV Adjust is compatible with common frame server programs like AviSynth. Therefore, file formats that AV Adjust doesn't support directly can also be imported.
  • Cutting functionality: While the production of the result file, parts of the video can be skipped. This offers a simple way to cut out unwanted scenes, like commercials etc.
  • Support of alias files: AV Adjust allows to exchange the video file in an existing project for a smaller working version (a so-called alias file), which makes the work more fluent and, in many cases, a frame server unnecessary.
  • Project analysis, optimization tools: Several functions help you to locate critical zones in your AV Adjust project. This will enable you to find and correct mistakes in time as well as to optimize the result of your work.