Invalid argument on capture

[metal3d]

Hello,

I'm very interested by your package but nothing works for me...

Here is a sample code:

package main

import (
	"log"
	"strings"

	"github.com/blackjack/webcam"
)

func main() {
	cam, err := webcam.Open("/dev/video0")
	if err != nil {
		panic(err.Error())
	}
	defer cam.Close()

	// Set the camera's resolution
	formats := cam.GetSupportedFormats()
	var format webcam.PixelFormat
	var width, height uint32

	for pf, f := range formats {
		f = strings.ToLower(f)
		log.Println("possible format", f)
		if strings.Contains(f, "jpeg") {
			format = pf
		}
	}
	sizes := cam.GetSupportedFrameSizes(format)
	for _, size := range sizes {
		log.Println("possible size:", size)
		if size.MaxWidth == 0 || size.MaxHeight == 0 {
			continue
		}
		width = size.MaxWidth
		height = size.MaxHeight
	}
	log.Println("Set resolution to: ", width, height, "and pixel format to: ", formats[format], format)

	cam.SetImageFormat(format, width, height)
	cam.SetFramerate(10)
	cam.SetBufferCount(1)

	err = cam.WaitForFrame(10)
	if err != nil {
		panic(err.Error())
	}
	frame, _, err := cam.GetFrame()
	if err != nil {
		log.Println(err.Error())
	} else {
		log.Println(len(frame))
	}
}

Whatever I try:

2022/05/18 14:00:43 possible format yuyv 4:2:2
2022/05/18 14:00:43 possible format motion-jpeg
2022/05/18 14:00:43 possible size: {1280 1280 0 720 720 0}
2022/05/18 14:00:43 possible size: {160 160 0 120 120 0}
2022/05/18 14:00:43 possible size: {176 176 0 144 144 0}
2022/05/18 14:00:43 possible size: {320 320 0 240 240 0}
2022/05/18 14:00:43 possible size: {352 352 0 288 288 0}
2022/05/18 14:00:43 possible size: {640 640 0 480 480 0}
2022/05/18 14:00:43 Set resolution to:  640 480 and pixel format to:  Motion-JPEG 1196444237
2022/05/18 14:00:43 invalid argument

Note that the error is raised on the GetFrame() call. I also try to not wait for the frame and to use ReadFrame but I've always got this error.

Can you tell me what I'm doing wrong ?