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Wirecast Audio Meter Scale?

I'm curious about the Wirecast Audio Meter scale.

The meter goes to +6. I'm assuming +6 dB, but it doesn't say. 

The distance from 0 to +6 is much less than between -0 and -6 (and there are eight hash marks from 0 to -6, to be picky about it).

In the digital systems I'm used to (Audition, Premiere Pro, Audacity, Pro Tools), the meters are calibrated in something called dBFS (deciBels Full Scale), where the loudest sound is Zero dBFS. The top of the meter is zero, and everything is a negative number below that. That makes sense, as there is no overshoot, no possibility of anything louder in a digital system.

OTOH, my Behringer X1622 mixer's meter is calibrated to +10. It has both analog and digital outputs, so I can kind of understand the need to emulate the old VU meter. 

I've experimented a bunch to get the compression and gating I want from the Wirecast Mixer and Dynamics FX. When I output to an mp4 file, and bring that into Audacity or Audition, I need to keep my audio peaks somewhere near... um, three hash marks below 0 to make an audio file in Audacity that peaks around 0 dBFS. I need to do more playing with that to report more accurately.

Before I ramble on (about things like the broadcast TV industry wanting their audio to peak around -10, not 0 dBFS), I wonder if there are some explanations and technical details about how Wirecast set up the audio mixer and meter calibration.

And if anyone else either understands it all, or is baffled by it, too.

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  • We really do need to explain the scale especially when people need to compare to other audio programs or hardware being used.

    Please do make the feature request for a "professional" explanation of our meter scale.

    Wirecast Feature Request Form

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  • Did this ever get done?  I'm trying to understand how the VU meters are calibrated too- it seems like they are linear (sort of) but very hard to compare to the output of my Allen and Heath or Yamaha mixers, or the Reaper and other DAWs I've used.

    It appears that Wirecast is just arbitrary and really doesn't have any calibration at all actually...

    Also, there appears to be automatic compression added to the signal going into Wirecast as well, and not a very good one either- it's way to harsh and rigid.  Can that be disabled?

    BTW, running WC version 14.2

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      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 4 mths ago
      • Reported - view

      Matthew N. Dudek The developers are still considering how to handle this.

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  • Hi All, still trying to nail down the audio issues we've been having, here's a good reference for the tech-types.

    I don't know if anyone at Telestream has ever done this before, but I took the time to plot out each of the major softwares in the channel to the NDI Audio Pattern Generator Standard, and from what I can see, Wirecast is the outlier in that it's VU Meter is calibrated differently than the others.  We did really well with the way OBS is calibrated because there is more variance in the area of near-full scale sound, making it easier to watch and adjust, whereas Wirecast's meter is calibrated too low to have that kind of control over it.  Wirecast uses a Linear scale whereas the other two use a logarithmic scale which is more accurate to the way sound actually works, which is logarithmic.

    See attached file for the details.

    Hopefully this helps.

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      • CraigSModerator
      • Telestream Desktop Forum Moderator
      • CraigS
      • 1 mth ago
      • Reported - view

      Matthew N. Dudek We are doing work on the audio meter scales. WIRE-18958 We will have this fixed in an upcoming version. Thanks for doing that work and comparisons. I'll show the PDF to developers for comparison.

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  • My take-away: mainly I just wish Wirecast would use the same logarithmic scale as the other products. It would make life so much easier...

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