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Audio Fade Script: API.XML Audio Numbers in a different scale to Volume Shortcut Scale
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Joined: 8/15/2013(UTC) Posts: 97   Location: Could be Australia could be Europe/UK! Thanks: 1 times
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Hi Guys, I have a script that fades the background music at the end of the broadcast to play the outro for the production that has its own audio. I have made a script that fades from where the audio level of the background music is set for the production. (eg if it is set at 70, it should fade to zero from 70.) I have a script that gets the audio level from API.XML but the numbers reported in API.XML are in a different scale to the numbers I need to set via the shortcut API. Volume Set via API---------Volume Reported via API.XML or Shortcut 100---------------------------------100 90---------------------------------65.60999 80---------------------------------40.96 70---------------------------------24.01 60---------------------------------12.96 50---------------------------------6.25 40---------------------------------2.56 30---------------------------------0.8100001 20---------------------------------0.16 10---------------------------------0.01 It seems that the API volume set is a linear 0-100, but the fader volume in vMix and the reported number are logarithmic. It is a bit of a pain in the ass. Any suggestions on how to make this work elegantly? If the dev team could add an Audio Fade function that would eliminate my need to do this script :) It is a lot of stuffing around to just automatically fade an audio channel out. My Script: Code:Dim doc As New XmlDocument()
dim bgmi = Input.Find("MUSIC")
doc.LoadXml(API.XML())
Dim node As XmlNode = doc.SelectSingleNode("/vmix/inputs/input[@title='MUSIC']")
Dim volume As Integer = node.Attributes.GetNamedItem("volume").Value
Console.WriteLine(volume)
Do While volume > 0
Console.WriteLine(volume)
bgmi.Function("SetVolume", volume)
volume = volume - 1
sleep(10)
Loop
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Rank: Advanced Member
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Joined: 8/15/2013(UTC) Posts: 97 Location: Could be Australia could be Europe/UK! Thanks: 1 times
Was thanked: 7 time(s) in 7 post(s)
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OK so my dad is an engineer and he worked out that it is a power curve relationship. So to get the correct volume level to set with the preset I need to do the volume reported, multiplied by one million to the power of 0.25 or Code:(volume * 1000000) ^ 0.25
Bunch of googling later I have the following working script: Code:Dim doc As New XmlDocument()
doc.LoadXml(API.XML())
Dim node As XmlNode = doc.SelectSingleNode("/vmix/inputs/input[@title='MUSIC']")
Dim volume As Long = node.Attributes.GetNamedItem("volume").Value
Dim y As Integer = (volume * 1000000) ^ 0.25
Do While y > -1
Input.Find("MUSIC").Function("SetVolume", y)
y = y - 1
sleep(8)
Loop
I had to set y = -1 in the loop as I can only set the volume as an integer (whole number) and it was rounding to 0 and exiting the loop before zeroing the volume. So it jumps to 0 if the volume slider is below 1, but I can live with that. Hope this helps someone else!
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Joined: 12/15/2018(UTC) Posts: 7  Was thanked: 2 time(s) in 2 post(s)
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Thank you for this script. I was able to reverse it for a fade-up function as well, I tried setting the less-than volume to 101 just in case. I changed the sleep time to 30 instead of 8, and that's giving me a slower transition time. I hope others are able to find this script as it works very well.
One question, is there an if/or function where we could have a single script raise or lower the volume based on its current state? If volume > -1, fade down, right? Or If volume < 101, fade up. I'm not sure there is a way to accomplish this, but it would make for a great single button script if it could be made to work.
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Rank: Advanced Member
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Joined: 12/27/2012(UTC) Posts: 5,220  Location: Belgium Thanks: 291 times
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Originally Posted by: on_call 
One question, is there an if/or function where we could have a single script raise or lower the volume based on its current state? If volume > -1, fade down, right? Or If volume < 101, fade up. I'm not sure there is a way to accomplish this, but it would make for a great single button script if it could be made to work.
vMix scripts are written in vb.net. Search google for IF THEN ELSE logic
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Rank: Advanced Member
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Joined: 5/14/2013(UTC) Posts: 140 Location: uk Thanks: 2 times
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Why not use the SetVolumeFade shortcut/command ???
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Rank: Advanced Member
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Joined: 8/15/2013(UTC) Posts: 97 Location: Could be Australia could be Europe/UK! Thanks: 1 times
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Originally Posted by: Henny Why not use the SetVolumeFade shortcut/command ??? I don't think this shortcut was available back then! This feature came in on vMix 21!
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Audio Fade Script: API.XML Audio Numbers in a different scale to Volume Shortcut Scale
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