I connected a webcam via USB cable to the computer. Unity notices the presence of the USB camera because it signals it to me with a generic "USB 28289 Device" in the Inspector of AR Camera. Initially it gave me an error of "webcam profile not found". So I modified the webprofiles.xml file adding the following code:

<webcam deviceName = "USB 28189 Device">

        <Windows>

            <! - size of the web cam texture requested from Unity ->

            <RequestedTextureWidth> 320 </ requestedTextureWidth>

            <RequestedTextureHeight> 240 </ requestedTextureHeight>

            <! - size of the texture Unity's web cam texture will be rescaled to ->

            <ResampledTextureWidth> 320 </ resampledTextureWidth>

        </ Windows>

        <Osx>

            <! - size of the web cam texture requested from Unity ->

            <RequestedTextureWidth> 320 </ requestedTextureWidth>

            <RequestedTextureHeight> 240 </ requestedTextureHeight>

            <! - size of the texture Unity's web cam texture will be rescaled to ->

            <ResampledTextureWidth> 320 </ resampledTextureWidth>

        </ Osx>

    </ Webcam>

In this way the "profile not found" error has disappeared. However when I run the application in Unity I get the following error:

- Composite

and in practice no video footage appears on the screen. How can I solve this problem? Where did I go wrong?

Thanks in advance for an answer.