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  1. Hi

    I have this avi movie which I just cannot get synced correctly, the file is completely out of sync by about 3 sec. I have tried using YAAI , and VirtualDub but I cannot even get the audio track to change, let alone sync the thing up. Can anyone here with more experience then me see why I cannot edit the sound track in this movie, any tips, advise welcome.

    *** MediaInfo Mac // Plain text file report
    2009-06-30 18:49:51 +0100
    Information for File:

    General / Container Stream # 1
    Total Video Streams for this File -> 1
    Total Audio Streams for this File -> 1
    Video Codecs Used -> XviD
    Audio Codecs Used -> MPEG-1 Audio layer 3
    File Format -> AVI
    Play Time -> 29mn 11s
    Total File Size -> 233 MiB
    Total Stream BitRate -> 1 115 Kbps
    Encoded with -> VirtualDubMod (build 2540/release)
    Encoding Library -> VirtualDub build 30091/release

    Video Stream # 1
    Codec (Human Name) -> MPEG-4 Visual
    Codec (FourCC) -> XVID
    Codec Profile -> Streaming Video@L1
    Frame Width -> 512 pixels
    Frame Height -> 384 pixels
    Frame Rate -> 29.970 fps
    Total Frames -> 52500
    Display Aspect Ratio -> 4/3
    Scan Type -> Progressive
    Colorimetry -> 4:2:0
    Codec Settings (Summary) -> BVOP / Packed Bitstream
    Codec Settings (Packet BitStream) -> Yes
    QF (like Gordian Knot) -> 0.156
    Codec Settings (BVOP) -> Yes
    Codec Settings (QPel) -> No
    Codec Settings (GMC) -> No warppoints
    Codec Settings (Matrix) -> Default
    Video Stream Length -> 29mn 11s 751ms
    Video Stream BitRate -> 918 Kbps
    Bit Depth -> 24 bits
    Video Stream Size -> 192 MiB (82%)
    Video Encoder -> XviD0037

    Audio Stream # 1
    Codec -> MPEG Audio
    Codec (FourCC) -> 55
    Codec Profile -> Joint stereo
    Audio Stream Length -> 29mn 11s 760ms
    Audio Stream BitRate -> 184 Kbps
    Audio Stream BitRate Mode -> VBR
    Number of Audio Channels -> 2
    Sampling Rate -> 48.0 KHz
    Bit Depth -> 16 bits
    Audio Stream Size -> 38.2 MiB (16%)
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  2. VirtualDub:

    1) File -> Open Video File
    2) Video -> Direct Stream Copy
    3) Audio -> Interleaving... set "Delay audio track by" 3000 to delay the audio by 3 seconds, -3000 to advance the audio by 3 seconds. You can verify the skew via the preview functions.
    4) File -> Save as AVI
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  3. Mod Neophyte Super Moderator redwudz's Avatar
    Join Date
    Sep 2002
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    I usually convert the MP3 VBR (Variable Bit Rate) audio to CBR, especially if I have sync problems. Since you are using VirtualDub, I would save out the VBR audio with full processing to a WAV and use something like Audacity to convert to CBR (Constant Bit Rate) MP3, then add this back into VD and delete the old audio, save out the files with Direct Stream Copy and see if that helps. VBR audio can cause a lot of sync problem when converting to other formats.

    If the sync is still off and the sync error is a constant amount the duration of the video, then you apply your offset. If it were 3 seconds, then that would be 3000ms offset. You can use a player like MPC to correct the sync, then plug that number into VD for the correction.

    It the sync error varies during playback, gradually getting worse after conversion to CBR, then the length of your audio and video files may be different. You can adjust the audio length with a program like Audacity.

    If you need to use Mac programs to do this, there are probably equivalent ones. I could move this thread to the Mac forum if you wanted. Or you could start a new thread there
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