VideoHelp Forum
+ Reply to Thread
Results 1 to 6 of 6
  1. I was ripping an old family video from a CD/DVD and I found the video to be ahead of the sound track. I believe an easy fix would be to load the video on Avidemux and reduce the delay of the soundtrack. I am yet to try that because as soon as I imported the video on Avidemux, I found that no sound was playing even though the original video on VLC Media Player had sound. Then I discovered about the meaningless time stamps on the video. I am attaching the mediainfo findings below for reference.
    Complete name : D:\pujo 2006.VOB
    Format : MPEG-PS
    File size : 1 023 MiB
    Duration : 14 s 688 ms
    Overall bit rate mode : Variable
    Overall bit rate : 585 Mb/s

    ID : 224 (0xE0)
    Format : MPEG Video
    Format version : Version 2
    Format profile : Main@Main
    Format settings : BVOP
    Format settings, BVOP : Yes
    Format settings, Matrix : Default
    Format settings, GOP : M=3, N=12
    Format settings, picture structure : Frame
    Duration : 14 s 504 ms
    Bit rate mode : Variable
    Bit rate : 573 Mb/s
    Maximum bit rate : 9 579 kb/s
    Width : 704 pixels
    Height : 576 pixels
    Display aspect ratio : 4:3
    Frame rate : 25.000 FPS
    Standard : PAL
    Color space : YUV
    Chroma subsampling : 4:2:0
    Bit depth : 8 bits
    Scan type : Interlaced
    Scan order : Top Field First
    Compression mode : Lossy
    Bits/(Pixel*Frame) : 56.486
    Time code of first frame : 00:30:14:22
    Time code source : Group of pictures header
    GOP, Open/Closed : Open
    Stream size : 991 MiB (97%)
    Color primaries : BT.601 PAL
    Transfer characteristics : BT.470 System B/G
    Matrix coefficients : BT.470 System B/G

    ID : 189 (0xBD)-128 (0x80)
    Format : AC-3
    Format/Info : Audio Coding 3
    Commercial name : Dolby Digital
    Muxing mode : DVD-Video
    Duration : 14 s 688 ms
    Bit rate mode : Constant
    Bit rate : 256 kb/s
    Channel(s) : 2 channels
    Channel layout : L R
    Sampling rate : 48.0 kHz
    Frame rate : 31.250 FPS (1536 SPF)
    Compression mode : Lossy
    Delay relative to video : -424 ms
    Stream size : 459 KiB (0%)
    Service kind : Complete Main

    Format : DVD-Video

    Even though it shows here the duration to be 14s I can absolutely confirm it is more than that as I myself had been watching the video for more than 5 minutes before discovering all this. What can I do in this case to properly timestamp the video and correct the sound delay ? Even the seek function in VLC seems to be broken for this particular video file.
    Since I am not sure which topic should I post it under, I am currently posting under the topic "Software Playing" as the error might be attributed to specific media player as well, but again I am not so sure about it.
    Any help and advice on this matter would be appreciated. Thanks
    P.S. A picture of the VLC dialog box in Fullscreen mode
    Quote Quote  
  2. Member
    Join Date
    Mar 2008
    United States
    Search Comp PM
    Try to remux the file, seems it has some issues, based on the info in mediainfo.

    Set the "output format" to Mpeg-PS Muxer, create an mpg file, and try that
    Quote Quote  
  3. Thanks a lot @davexnet , that tip definitely worked out for me and the time stamps looks to be corrected now.
    But are you sure that I won't be losing picture quality over this remuxing process ?
    Quote Quote  
  4. Member
    Join Date
    Mar 2008
    United States
    Search Comp PM
    No change to the picture. It's not re-encoded just rewrapped in the different container
    Quote Quote  
  5. Member
    Join Date
    May 2005
    Australia-PAL Land
    Search Comp PM
    But are you sure that I won't be losing picture quality over this remuxing process ?
    Provided you have the AVIDemux Video Output on Copy, you won't get any recoding.

    That looks like a standard VOB to me; ~1000mb, it should give you a video length of around 20 minutes. If it is being smart-copied/rendered, it will fly through it in quick time, probably a minute or so. If it was being re-encoded, it would take much longer.

    You can see this difference yourself: do one export with the Video Output set to "Copy", then do another export with Video Output set to "Mpeg2ff". "Copy" took 1 minute on my system with "Mpeg2ff", the full re-encode, taking around 15 minutes.
    Quote Quote  
  6. Alright, thanks for the information.
    Quote Quote  

Similar Threads

Visit our sponsor! Try DVDFab and backup Blu-rays!