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How to normalize or compress dynamic range across multiple clips and individual clips

Last post 03-12-2015, 10:51 by culpanr. 10 replies.
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  •  02-10-2014, 13:49 623633

    How to normalize or compress dynamic range across multiple clips and individual clips

    I can't seem to find a direct answer and wondering if this is because it can't be done?

    I have about 30 video clips on timeline.  Each one is a different volume level.  And each clip has varying volume levels.

    I hope to do two things-

    1> Within a single clip, the presenters voice is soft, and the audience clapping and laughing is very loud.  Is their a way to just compress the dynamic range so the clapping and laughing from audience is not so much louder than presenter. 

    2> can I select all 30 video clips and normalize the volume across all 30 clips?

    Thanks 

  •  02-10-2014, 14:49 623647 in reply to 623633

    Re:How to normalize or compress dynamic range across multiple clips and individual clips

    Hi and welcome aboard this forum.

    1) You have a leveler effect for this in the Audio effects

    2) You can't

  •  02-10-2014, 16:30 623669 in reply to 623647

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    saby:

    Hi and welcome aboard this forum.

    1) You have a leveler effect for this in the Audio effects

    2) You can't

    Thanks Saby,

    Just to be clear, I need to manually adjust the audio for each clip to make them more equal in volume right?

     

     

  •  02-10-2014, 16:32 623670 in reply to 623669

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    Yes.
  •  02-11-2014, 2:17 623694 in reply to 623670

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    Do you know of any videos that show how to use Leveler?  I have been playing with Leveler but can't figure out how to compress the louder peaks down.

    The presenter speaking is at -6dB.  The crowd clapping and laughing is maxed out in the red at 0 dB.  I would like to increase volume of speaker and cap the laughing/clapping at around -3dB.  What settings for:

    Target Volume, Compression, Expansion, and Threshold would you suggest?

    Thanks 

  •  02-12-2014, 15:43 623870 in reply to 623694

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    Sorry, I never had to use it myself, so no idea on how to get it work.
  •  02-12-2014, 16:49 623877 in reply to 623870

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    saby:
    Sorry, I never had to use it myself, so no idea on how to get it work.
    No problem.  I tried contacting Pinnacle but they charge for technical support.  I also googled,searched youtube, read the manual, and nothing.  I just can't find any description of how to use Leveler.  At least anything meaningful that goes into any detail.

     

  •  03-12-2015, 1:51 668265 in reply to 623670

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    On #2, why can't you detach the audio for all the clips, export audio only, and then put the exported audio onto a new timeline?  (and mute the original audio.)  Then you'll have only one audio clip to work with.

     Am I missing something??

  •  03-12-2015, 8:01 668283 in reply to 668265

    Re: Re:How to normalize or compress dynamic range across multiple clips and individual clips

    No, you're right. That's a valid workaround. Yes
  •  03-12-2015, 10:03 668296 in reply to 668283

    Re: How to normalize or compress dynamic range across multiple clips and individual clips

    Attachment: PS18 compressor.jpg

    The "Leveler" effect is one of the legacy effects carried forward from Pinnacle Studio 15 and earlier; you can find a little (not very good) information about how to use it in the Pinnacle Studio 15 manual (in the English manual it's on page 335). You can download Pinnacle Studio 15 manuals from this page in the Corel knowledge base.

    However, IMO the "Leveler" (along with several other legacy effects) has not been "ported" properly and the "calibration" / "meaning" of the knobs has been lost; instead of showing values in dB etc. you get a generic knob that adjusts from 0 to 1.

    But, for the "Leveler", here are the values shown in PS14 (I am guessing that a value of 0 on the knob in PS18 will equate to the lowest value in PS14, and a value of 1 in S18 will equate to the highest value in PS14. But whether it varies in a linear fashion in between is anybody's guess Sad:

    • Target Volume: -20dB to 0dB
    • Compression: 1:1 to 10:1
    • Expansion: 0.2:1 to 5:1
    • Threshold: -60dB to 0dB


    Note the PS18 does have another, newer tool that can achieve the same as "Leveler" - that tool is "Compressor" and you will find it in the media editor under the "Corrections" tab. There is some pop-up help if you hover the mouse pointer over any of the adjustment knobs and a little documentation in the PS18 user manual (in the English manual it's on pages 245 and 246).

    Regards,
    Richard

     


  •  03-12-2015, 10:51 668302 in reply to 668296

    Re: How to normalize or compress dynamic range across multiple clips and individual clips

    Fired up PS14 Ultimate and did some comparisons in the Leveler there and in PS18 Ultimate. Here is some "calibration" information if wanting to use the effect in PS18:

    Target Volume:
    This is the threshold at which compression will begin (audio levels above this will be compressed, those below will be allowed through unchanged). Control does appear to have a linear action:

    ADDED: Also appears to affect amplification of quieter signals that are below this level, but above the "Threshold" (last control). The maximum amount of amplification appears to be governed by the setting of this "Target Volume" control and the "Compression" control and is not separately adjustable.

    0 = -20dB
    0.25 = -15dB
    0.5 = -10dB
    0.75 =-5dB
    1.0 = 0dB

    Compression:

    Sets the "strength" of the compression for audio above the "Target Volume". Control does in fact have a linear adjustment range from 1:1 to 10:1, so for easy calculation purposes can be considered to be divided up into "ninths"

    0 = 1:1
    0.11 =  2:1
    0.22 = 3:1
    0.33 = 4:1
    0.44 = 5:1
    0.56 = 6:1
    0.67 = 7:1
    0.78 = 8:1
    0.89 = 9:1
    1.0 = 10:1

    Expansion:

    Controls a reduction of gain for very quiet signals (below the value set in "Threshold" (last control). Most useful for gently reducing background noises when working with off-screen dialogue. The control does appear to have a linear action - however because the lowest value is not a nice round number (0.2, not zero), the calculation is a bit more awkward.

    Knob value = (desired ratio - 0.2) / 4.8   - so some useful values:

    0 = 0.2:1
    0.06 = 0.5:1
    0.17 = 1:1
    0.27 = 1.5:1
    0.38 = 2:1
    0.58 = 3:1
    0.79 = 4:1
    1.0 = 5:1

    Threshold:

    Defines a "noise floor" for the "Expansion" function; for signals below this level the expansion (gain reduction) will be applied. Control does appear to have a linear action:

    0 = -60dB
    0.17 = -50dB
    0.33 = -40dB
    0.5 = -30dB
    0.67 = -20dB
    0.83 = -10dB
    1.0 = 0dB

    HTH
    Richard

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