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Shortcuts / Scripting Set Master Volume
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Joined: 10/20/2021(UTC) Posts: 5  Location: Ontario Thanks: 1 times
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When using the Shortcut / scripting function "SetMasterVolume", Integer values between 0 and 100 are permitted. Setting a Value of 0 or 100 produces the expected result, but any number in between does not work as expected. For example, the following script: Quote:
'======================================
' Set Volume Script =
'======================================
'State variables
Dim state as new system.xml.xmldocument
Dim CurrentVolume As Double
Dim TextLine As String
TextLine = "Setting new volume of 40"
Console.WriteLine(TextLine)
API.Function("SetMasterVolume", Value:=40)
'=========Get Current Volume========
'Current status
state.loadxml(API.XML())
CurrentVolume = (state.SelectSingleNode("//audio/master/@volume").Value)
TextLine = "The Volume Actually Set is " + CurrentVolume.ToString()
Console.WriteLine(TextLine)
Produces this result: Quote:
Starting Script "Set Volume"
Setting new volume of 40
The Volume Actually Set is 2.56
Stopping Script "Set Volume"
I Testes all of the values from 0 to 100 usning the following script: Quote:
'======================================
' Test Volume Script =
'======================================
'State variables
Dim state as new system.xml.xmldocument
Dim CurrentVolume As Double
Dim NewVolume As Integer
Dim TextLine As String
Console.WriteLine("Set Volume,Actual Volume")
'=========Set Current Volume From 0 to 100========
For NewVolume = 0 To 100
API.Function("SetMasterVolume", Value:=NewVolume)
'Get Actual Volume========
state.loadxml(API.XML())
CurrentVolume = (state.SelectSingleNode("//audio/master/@volume").Value)
TextLine = NewVolume.ToString() + "," + CurrentVolume.ToString()
Console.WriteLine(TextLine)
Next
I plotted the results in Excel and got the following relationship:  Volume Settings Plot.jpg (24kb) downloaded 1 time(s).I suspect that the input to the SetMasterVolume function is an integer, but is being interpreted by vMix as a float value.
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Rank: Advanced Member
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Joined: 12/27/2012(UTC) Posts: 5,085  Location: Belgium Thanks: 284 times
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 1 user thanked doggy for this useful post.
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Rank: Newbie
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Joined: 10/20/2021(UTC) Posts: 5 Location: Ontario Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
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@doggy: Thank you for pointing me to that link. It was very helpful in explaining what is happening I have a follow-up question regarding volume settings: My goal is to make two shortcut keys to incrementally increase and decrease the final sound level so that it can be managed from the xMix Web Controller. Should I set the scripts to increment the sound level by a fixed amplitude, volume or decibel? I have no audio experience, but my reading on the internet suggests I should use fixed volume increments, similar to a fixed distance on a fader. What do others suggest?
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Rank: Advanced Member
Groups: Registered
Joined: 12/27/2012(UTC) Posts: 5,085 Location: Belgium Thanks: 284 times
Was thanked: 920 time(s) in 759 post(s)
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Originally Posted by: GregS  @doggy: Thank you for pointing me to that link. It was very helpful in explaining what is happening I have a follow-up question regarding volume settings: My goal is to make two shortcut keys to incrementally increase and decrease the final sound level so that it can be managed from the xMix Web Controller. Should I set the scripts to increment the sound level by a fixed amplitude, volume or decibel? I have no audio experience, but my reading on the internet suggests I should use fixed volume increments, similar to a fixed distance on a fader. What do others suggest? IMO just do a value +=1 for up and -=1 for down in the shortcuts (can change 1 to another for bigger steps )
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Rank: Newbie
Groups: Registered
Joined: 10/20/2021(UTC) Posts: 5 Location: Ontario Thanks: 1 times
Was thanked: 1 time(s) in 1 post(s)
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To close the loop on this topic: I found that just changing the "Master Volume" by 1 was too coarse because about 4 clicks of the button went from full volume to mute. I ended up converting the Audio>Master>Volume (Amplitude*100) to Volume using the formula: Quote:CurrentVolume = ((CurrentAmplitude/100)^0.25)*100 . Changing this by 2 gave a comfortable resolution. The final code is here: Quote:
'======================================
' Decrease Volume Script =
'======================================
'Input variable
Dim VolumeChange As Double = -2
'State variables
Dim CurrentAmplitude As Double
Dim CurrentVolume As Double
Dim NewVolume As Long
Dim TextLine As String
'=========Get Current Amplitude ========
'Current status
Dim state as new system.xml.xmldocument
state.loadxml(API.XML())
CurrentAmplitude = (state.SelectSingleNode("//audio/master/@volume").Value)/100
TextLine = "The current Amplitude is " + CurrentAmplitude.ToString()
Console.WriteLine(TextLine)
'=========Convert Amplitude to Volume ========
CurrentVolume = (CurrentAmplitude^0.25)*100
TextLine = "The current Volume is " + CurrentVolume.ToString()
Console.WriteLine(TextLine)
'=========Set New Volume========
NewVolume = CurrentVolume + VolumeChange
TextLine = "Setting new volume of " + NewVolume.ToString()
Console.WriteLine(TextLine)
API.Function("SetMasterVolume", Value:=NewVolume)
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