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Use unique device path per registered camera #17

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letmaik opened this issue Apr 19, 2021 · 1 comment · May be fixed by #36
Open

Use unique device path per registered camera #17

letmaik opened this issue Apr 19, 2021 · 1 comment · May be fixed by #36

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@letmaik
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letmaik commented Apr 19, 2021

UnityCapture/Source/UnityCaptureFilter.cpp

Line 1106 in fe461e8

RegSetValueExA(hKey, "DevicePath", 0, REG_SZ, (LPBYTE)"foo:bar", (DWORD)sizeof("foo:bar"));

Applications which use the device path to differentiate cameras stumble since every registered Unity Video Capture instance uses the same device id. OBS has no problems with it, but for example Zoom shows all cameras but only allows to select the first one. Skype only shows the first one.

Quoting from the Microsoft docs:

The "DevicePath" property is not a human-readable string, but is guaranteed to be unique for each video capture device on the system. You can use this property to distinguish between two or more instances of the same model of device.

To be honest though, I'm not sure if this hack is needed anymore. The virtual camera from OBS doesn't have a device path and works in all apps incl Skype. Maybe it got fixed at some point in Windows? The forum thread referenced in the code is 9 years old.
@letmaik letmaik mentioned this issue Apr 19, 2021
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@mirh
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mirh commented Jan 11, 2022

Skype was indeed bugged/regressed when it started to require it, and it was fixed soon as you can read in the comments of the blog linked in the thread.
But unity still requires it.

@nagoya0 nagoya0 linked a pull request May 25, 2023 that will close this issue
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Fix Unity capture filter instances use the same device path nagoya0/UnityCapture
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@letmaik @mirh