Assertion: 'inchannels <= mMixMatrixCurrent.numin()'

FMOD Engine
1

I receive this error in the debug callback

assertion: 'inchannels <= mMixMatrixCurrent.numin()' failed

File and line info
Trace : < assert c:\jk\workspace\Build__1.10__API_Win\lowlevel_api\src\fmod_dsp_connectioni.cpp:575]

What does it mean and how can it be resolved?

2

You are seeing an internal consistency check fail, could you provide a way to reproduce it?
Once we know the cause we will be better positioned to recommend workarounds or action a fix.

3

I get this in Unity too, is there a way to get more logs?

[FMOD] assert : assertion: 'inchannels <= mMixMatrixCurrent.numin()' failed

UnityEngine.Debug:LogError (object)
FMODUnity.RuntimeUtils:DebugLogError (string) (at Assets/Plugins/FMOD/src/RuntimeUtils.cs:580)
FMODUnity.RuntimeManager:DEBUG_CALLBACK (FMOD.DEBUG_FLAGS,intptr,int,intptr,intptr) (at Assets/Plugins/FMOD/src/RuntimeManager.cs:104)
4

The FMOD initialization settings in Unity have an option for changing the logging level, you can get all the FMOD logging by setting it to Log.

5

Can’t see anything related, what about you?

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Seems to happen after first song is opened from file.

6

Which version of FMOD for Unity are you using?

7

Tried (the newest as of right now) 2.02.24 and 2.02.21

8

You mentioned that it ‘seems to happen after first song is opened from file’:
Is the song being played through a bank or ogg file?
Are you using any dsp effects on the song?

9

From file, MODE.NONBLOCKING | MODE.CREATESTREAM .

I have a dsp reading data all the time for FFT and visualization. Anything wrong here?

public KSDspCapture(ChannelGroup channelGroup)
{
	// Assign the callback to a member variable to avoid garbage collection
	readCallback = CaptureDSPReadCallback;

	// Allocate a data buffer large enough for 8 channels, pin the memory to avoid garbage collection
	// 8 channel * data for 8192 length
	uint bufferLength;
	RuntimeManager.CoreSystem.getDSPBufferSize(out bufferLength, out var _).Throw();
	uint multi = (uint)math.ceil(8192f / bufferLength);
	bufferLength = bufferLength * multi * 8;
	buffer = new((int)bufferLength, Allocator.Persistent);

	// Get a handle to this object to pass into the callback
	// Define a basic DSP that receives a callback each mix to capture audio
	DSP_DESCRIPTION desc = new DSP_DESCRIPTION();
	desc.numinputbuffers = 1;
	desc.numoutputbuffers = 1;
	desc.read = readCallback;

	RuntimeManager.CoreSystem.createDSP(ref desc, out captureDSP).Throw();

	channelGroup.getDSP(CHANNELCONTROL_DSP_INDEX.HEAD, out var channelGroupDsp).Throw();
	captureDSP.addInput(channelGroupDsp, out channelToCaptureConnection, DSPCONNECTION_TYPE.SEND_SIDECHAIN).Throw();

	RuntimeManager.CoreSystem.getMasterChannelGroup(out var master).Throw();
	master.getDSP(CHANNELCONTROL_DSP_INDEX.TAIL, out var masterTail).Throw(); //move this to before fader
	masterTail.addInput(captureDSP, out var con, DSPCONNECTION_TYPE.SIDECHAIN);

	captureDSP.setActive(true).Throw();

	dspHandle = captureDSP.handle;
	DspsLookup.Add(dspHandle, this);
10

The only thing that stands out is it looks like you aren’t passing a handle through the usedata of the FMOD.DSP_DESCRIPTION like we do in the DSP Capture example, although I assume your DspsLookup is taking care of that instead.

Are you able to trim down a project, that does the bare minimum to throw the error, which you are able to share with us? I have been unable to reproduce the issue here so far.