how to edit xvid audio (ac3) file (too low volume)

Discussion in 'DivX / XviD' started by kthan, Aug 4, 2006.

  1. kthan

    kthan Member

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    I had some XviD viles (with AC3, 448kbps) and they had too low volumes (I can barely hear the sound even at max volumes).

    Does this something to do with its higher bitrate? How to resolve this issue? I opened Soundforge 8 (to nomalize the file again), but this cannot read the file. Is there any plug-in to read XviD? Or, do I have to save it to wav. and reprocess (but, I don't think I can reproduce xvid<ac3> again in soundforge).

    Since I will view the files in DivX-compatible player, I need to keep XviD format (not encode with MPEG2). Please advise me the best (easiest) way to do it.
     
    kthan, Aug 4, 2006
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  2. celtic_d

    celtic_d Regular member

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    XviD has nothing to do with audio. It is a video codec only. If you want to deal with the audio, then anything you use doesn't need to support XviD. Only AC3.

    What container?
     
    celtic_d, Aug 5, 2006
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  3. The_OGS

    The_OGS Active member

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    Hi kthan,
    If you have an AVI with AC3 audio, this is a known issue.
    AC3 audio is not supported natively by Windows, and you must have an AC3 codec installed. Many use a popular software DVD player or programs like NeroVision Express will install one.
    Anyway, it sounds like (no pun intended) you need the latest AC3Filter:
    http://www.afterdawn.com/software/video_software/codecs_and_filters/ac3filter.cfm
    It has adjustable AC3 playback gain - just what everyone needs, actually.
    You are correct, you could extract the AC3 to WAV normalized to -0dB, and then encode WAV to maybe VBR MP3, and re-mux with video again - but that's a bunch of work, LoL
    Regards
     
    The_OGS, Aug 6, 2006
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  4. MysticE

    MysticE Active member

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    >> You are correct, you could extract the AC3 to WAV normalized to -0dB, and then encode WAV to maybe VBR MP3,

    If you go to that trouble stick to CBR for the audio, AVI's with VBR mp3 audio can be a pain in the neck.
     
    MysticE, Aug 7, 2006
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  5. The_OGS

    The_OGS Active member

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    I have ~200 AVIs with VBR MP3 audio, no problems at all.
    But you are right, some people require playback on different devices and the tolerance of each for VBR audio must be determined.
    Also, when people feel the AVI is a 'starting point' and intend to then decompress/expand/transcode it to their requirements, VBR can be more likely to create synch issues.
    But for simply backing up MPEG2 to MPEG4 AVI, you can't compromise quality to enhance (someone else's) potential future compatibility requirements, y'know?
    My VBR AVIs are for PC playback and are perfectly suitable for streaming over my small private LAN, so no worries...
    L8R
     
    The_OGS, Aug 7, 2006
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