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Activity Forums VEGAS Pro Dolby 5.1, AC3 Confusion

  • Dolby 5.1, AC3 Confusion

    Posted by John Force on April 13, 2011 at 1:52 am

    I already asked this question (but not in these words) and got an answer. Now I find myself still confused on the subject. I will summarize:
    I have a clip I downloaded that has Dolby THX 5.1 audio. When I import it into Vegas Pro, I see all the separate audio tracks. When I render it to AC3 5.1 DVD, and reimport it into Vegas, I see only the “normal” stereo track (not the individual front, rear, LFE tracks that I see on the original file mentioned above). Is the 5.1 info still there (just encoded in the stereo tracks waiting to be decoded by my Dolby 5.1 stereo receiver)?
    Thanks.

    John Force replied 15 years, 1 month ago 2 Members · 3 Replies
  • 3 Replies
  • Stephen Mann

    April 13, 2011 at 3:51 am

    I don’t do any 5.1 work, but Vegas doesn’t “read” AC3 files.

    Steve Mann
    MannMade Digital Video
    http://www.mmdv.com

  • John Force

    April 13, 2011 at 3:51 pm

    >Vegas doesn’t “read” AC3 files

    Then why do all the 5.1 channels appear when I import the 5.1 clip I mentioned?
    (It’s a vob file with 5.1 channels, so I may be using the wrong terminology. I said AC3 because that’s what Vegas shows in the file properties.)
    Thanks.

  • John Force

    April 13, 2011 at 4:52 pm

    Here is (hopefully) a clearer description of my exact steps:

    1-New Project>File>Properties>Match Media = 5.1 on “Audio” tab.
    2-Import Media. All (individual) audio tracks import (Front L/R, C, Rear L/R, LFE).
    3-Edit my video clips.
    4-Render to NTSC DVD Widescreen with 5.1 Audio.
    Test:
    1-New Project>File>Properties>Match Media = 5.1 on “Audio” tab.
    2-Import Media (the rendered DVD). One stereo audio track imports (no C, Rear, LFE).

    Which leads me back to my original question:
    Are the 5.1 tracks “hidden” (encoded?) in the stereo track I now see?

    Thanks for the help.

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