Why is Audio out of sync when VOB's play fine?

Discussion in 'DivX / XviD' started by ugc, Jan 28, 2006.

  1. ugc

    ugc Regular member

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    after using shrink to get "Movie Only" onto hd, then playing the VOB's, ALL is great. Audio and Video "in sync".

    Then why when you convert to xvid, on some movies, the audio is way off?

    I don't get it.

    This is a general question. I have used many programs to convert to xvid, and all of them, at some time, on certain movies, have had this issue. I am having this problem right now with the movie "Transporter 2".
     
  2. aldaco12

    aldaco12 Active member

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    Tha fact that the movie has a constant A/V delay (which is taken into account in the VOBs, but could have been ignored, when you extracted the audio and converted it to MP3 (or riff/WAW).

    Please note that the trivial (and free) ReJig authoring program has an option , under IFO mode 'correct AC3 delay' which will demux an AC3 stream with zero A/V delay.

    Usually, the delay must is taken into account during DVD authoring. But, in AVIs, the delay must be reduced to zero. This, either extracting a 0-delay AC3 [with ReJig] and compressing it to MP3 or correcting manually the delay during AC3 --> MP3 compression for the AVI (both HeadAC3he and BeSweet can, provided you know the delay, in ms. The ripper programs usually tell you the delay information, on a 'information' TXT file).

     
    Last edited: Jan 30, 2006
  3. ugc

    ugc Regular member

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    thanks for the reply. That is very helpful.
     

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