Problem with sound

Discussion in 'Other video questions' started by Shelly2Bt, Dec 14, 2001.

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  1. Shelly2Bt

    Shelly2Bt Guest

    Hi All

    I have converted avis to mpgs using TMPGEnc before with no problems. This time however although the sound is fine in the avi there is no sound in the mpg. Any ideas anyone?

    thanks
    Shelly
     
    Shelly2Bt, Dec 14, 2001
    #1
  2. dRD

    dRD I hate titles Staff Member

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    No audio codecs installed or AC3 audio in the source file.
     
    dRD, Dec 15, 2001
    #2
  3. Shelly2Bt

    Shelly2Bt Guest

    Thanks

    I don't understand that the sound in the avi is ok though. Can I fix the sound in the mpg or do I need to try to convert it with other software?

    Cheers
    Shelly
     
    Shelly2Bt, Dec 15, 2001
    #3
  4. Shelly2Bt

    Shelly2Bt Guest

    dRD - please help me!!!

    Thanks
    Shelly
     
    Shelly2Bt, Dec 15, 2001
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  5. dRD

    dRD I hate titles Staff Member

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    My guess is really that the audio is in AC3 and as far as I understand, TMPGEnc can't handle multichannel audio, so you need to downmix the audio somehow to regular stereo-WAV, probably by using VirtualDub to save WAV and select Full processing mode for audio and select the conversion correctly (44.1kHz, stereo). I'm not sure tho', just my initial thought.
     
    dRD, Dec 15, 2001
    #5
  6. Shelly2Bt

    Shelly2Bt Guest

    Hmmm - can you say that again in English??!!! Only kidding.

    So first I decode your message, then.....

    I'll give it a try - thanks for your help.

    Shelly
     
    Shelly2Bt, Dec 15, 2001
    #6
  7. dRD

    dRD I hate titles Staff Member

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    Heh :) To put it simple:

    MPEG-1 video, which is the thing that VCDs have, can only contain video file with _stereo_ or mono audio (read: 2 or 1 audio channels) and can't have AC3 audio. AC3 audio is a 5.1 surround audio, meaning that it contains 6 audio channels.

    And my guess is that your AVI contains AC3 audio track inside it and therefor TMPGEnc can't handle it. So, you need to "downmix" this 5.1 audio to stereo audio -- it basically means that some program combines 6 audio tracks into 2 audio tracks and saves that thing in WAV format and then you can load the original AVI to TMPGEnc as your video source and the saved downmixed WAV as your audio source.
     
    dRD, Dec 15, 2001
    #7
  8. Shelly2Bt

    Shelly2Bt Guest

    ahhh - so simple when you know how:)

    How come you know so much?!!
     
    Shelly2Bt, Dec 16, 2001
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  9. dRD

    dRD I hate titles Staff Member

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    Ok, to specify the solution (had to try it :) -- open the AVI with VirtualDub and save WAV. Then use Azid (download it and look at the guides at http://doom9.net/ ) to downmix the audio and save the downmixed WAV and use that as your audio source for TMPGEnc.
     
    dRD, Dec 16, 2001
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  10. dRD

    dRD I hate titles Staff Member

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    I've learned all the stuff from 1,000's of excellent guides and by using basic logic :) I helped out guys ripping DVDs even before I had my own DVD-ROM ;-)
     
    dRD, Dec 16, 2001
    #10
  11. Shelly2Bt

    Shelly2Bt Guest

    Thank you

    Do you know if there is somewhere else to the Azid GUI from as the link doesn't seem to work and I can't use Azid without it.

    Cheers
    Shelly
     
    Shelly2Bt, Dec 16, 2001
    #11
  12. dRD

    dRD I hate titles Staff Member

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    dRD, Dec 16, 2001
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  13. Shelly2Bt

    Shelly2Bt Guest

    Once again, thank you - it works from your link.

    Do you have a fan club:)
     
    Shelly2Bt, Dec 16, 2001
    #13
  14. Shelly2Bt

    Shelly2Bt Guest

    dRD - sorry to keep bothering you but...

    I now have Azid but it is asking me for an ac3 file which I don't have - do I?

    I now have an avi, a wav and a mpg with no sound.

    I think i'm just to stupid for this game!!!!

    Thanks
    Shelly
     
    Shelly2Bt, Dec 16, 2001
    #14
  15. dRD

    dRD I hate titles Staff Member

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    If you opened the AVI with VirtualDub and saved the WAV, it should be in AC3 format and that is the file that you should open. If you insist (or the program does), you can rename the .wav into .ac3 before you convert it with Azid.
     
    dRD, Dec 16, 2001
    #15
  16. Shelly2Bt

    Shelly2Bt Guest

    Thank you again

    Don't get all comfortable and think this is the last you will hear from me!!! Hee hee hee
    :)
     
    Shelly2Bt, Dec 16, 2001
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  17. dRD

    dRD I hate titles Staff Member

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    I wont, I promise ;-)
     
    dRD, Dec 16, 2001
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  18. Shelly2Bt

    Shelly2Bt Guest

    OK dRD what am i doing wrong now

    I followed the instructions in the doom9 guide but i don't get a wav file - it is 0 bytes.

    Cheers
    Shelly
     
    Shelly2Bt, Dec 16, 2001
    #18
  19. Shelly2Bt

    Shelly2Bt Guest

    Hi dRD

    I have now tried using the wav from VirtualDub as the audio in TMPGEnc - and it works.

    Thanks for all your help
    Cheers
    Shelly
     
    Shelly2Bt, Dec 16, 2001
    #19
  20. dRD

    dRD I hate titles Staff Member

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    Ok, cool.
     
    dRD, Dec 16, 2001
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