`stream.GetVideoTracks()` is panicing

[Onyz107]

Your environment.

• Version: v0.7.2
• Browser: 1.84.132 Chromium: 142.0.7444.60 (Official Build) (64-bit)
• Other Information -

[signal 0xc0000005 code=0x0 addr=0x30 pc=0x7ff6ff9de64d]

goroutine 1 [running]:
main.main()
        C:/Users/zaid2/OneDrive/Desktop/GoProjects/Practice/main.go:25 +0x2d
exit status 2

What did you do?

I simply copied and pasted the example usage code in the README.md and ran the program.

What did you expect?

I expected it to save the snapshot as a PNG to the disk

What happened?

It complained about a memory address or a nil pointer dereference on line 25 which is:
track := stream.GetVideoTracks()[0]

Full code:

package main

import (
	"image/jpeg"
	"os"

	"github.com/pion/mediadevices"
	"github.com/pion/mediadevices/pkg/prop"

	// This is required to register camera adapter
	_ "github.com/pion/mediadevices/pkg/driver/camera"
)

func main() {
	stream, _ := mediadevices.GetUserMedia(mediadevices.MediaStreamConstraints{
		Video: func(constraint *mediadevices.MediaTrackConstraints) {
			// Query for ideal resolutions
			constraint.Width = prop.Int(600)
			constraint.Height = prop.Int(400)
		},
	})

	// Since track can represent audio as well, we need to cast it to
	// *mediadevices.VideoTrack to get video specific functionalities
	track := stream.GetVideoTracks()[0]
	videoTrack := track.(*mediadevices.VideoTrack)
	defer videoTrack.Close()

	// Create a new video reader to get the decoded frames. Release is used
	// to return the buffer to hold frame back to the source so that the buffer
	// can be reused for the next frames.
	videoReader := videoTrack.NewReader(false)
	frame, release, _ := videoReader.Read()
	defer release()

	// Since frame is the standard image.Image, it's compatible with Go standard
	// library. For example, capturing the first frame and store it as a jpeg image.
	output, _ := os.Create("frame.jpg")
	jpeg.Encode(output, frame, nil)
}

EDIT: I added a check to mediadevices.GetUserMedia:

	stream, err := mediadevices.GetUserMedia(mediadevices.MediaStreamConstraints{
		Video: func(constraint *mediadevices.MediaTrackConstraints) {
			// Query for ideal resolutions
			constraint.Width = prop.Int(600)
			constraint.Height = prop.Int(400)
		},
	})
	if err != nil {
		panic(err)
	}

And this is the result:

PS C:\Users\zaid2\OneDrive\Desktop\GoProjects\Practice> go run .\main.go
panic: failed to open device: failed to connect filters

goroutine 1 [running]:
main.main()
        C:/Users/zaid2/OneDrive/Desktop/GoProjects/Practice/main.go:23 +0x145
exit status 2