在 AWS Device Farm 中，如果摄像头变黑，这意味着什么？

Question

我使用 cordova 和 "cordova-plugin-camera-preview" 插件制作了一个应用程序。我试图在 AWS Device Farm 上对其进行测试，但该插件应该显示视频捕获的屏幕截图是黑色的，当测试完成时它没有显示错误。

这是什么意思？

这是我用来获取视频捕获的两个函数（适用于我的 phone）：

function captura_video() {
            try{     

                window.canvas_video_temp = document.createElement("canvas");
                window.contexto_video_temp = canvas_video_temp.getContext("2d");

                var promisifiedOldGUM = function(constraints) {
                    var getUserMedia = (navigator.getUserMedia || navigator.webkitGetUserMedia || navigator.mozGetUserMedia);

                    if(!getUserMedia) {
                        return Promise.reject(new Error('Este dispositivo no esta preparado para el manejo de camara'));
                    }

                    return new Promise(function(resolve, reject) {
                        getUserMedia.call(navigator, constraints, resolve, reject);
                    });
                }

                if(navigator.mediaDevices === undefined) {
                    navigator.mediaDevices = {};
                }

                if(navigator.mediaDevices.getUserMedia === undefined) {
                    navigator.mediaDevices.getUserMedia = promisifiedOldGUM;
                }

                window.videoElement = document.getElementById("pantalla_video");

                navigator.mediaDevices
                .getUserMedia(window.constraints)
                .then(
                    stream => {
                        window.videoElement.srcObject=stream;
                        window.videoElement.onloadedmetadata = () => {
                            if(window.interruptor_buscador == true){
                                auxiliar_1();
                            }else if(window.interruptor_enlace == true){
                                auxiliar_2();
                            }
                            window.videoElement.play();
                            bucle_cuadros();
                        };
                    }
                ).catch(
                    err => {
                        alert("Error mediaDevices: " + err.code);
                    }
                );
            }catch(err2){
                alert("Error de captura de video: " + err2.message);
            }
        }


        function bucle_cuadros(){
            try{
                if (window.videoElement.readyState === window.videoElement.HAVE_ENOUGH_DATA) {
                    //SOME DIRTY THINGS HERE
                }
                requestAnimationFrame(bucle_cuadros);
            }catch(err){
                alert("Error bucle_captura: " + err.message);
            }
        }

这是AWS Device Farm提供的截图：谢谢

Answer 1

你是截屏还是用相机拍照？

https://aws.amazon.com/device-farm/faqs/

Q: Can I use the device camera?

Yes, you can use the device cameras, both front- and rear-facing. Due to the way the devices are mounted, images and videos may look dark and blurry.

我认为 Device Farm 中应该会出现此图像。

HTH

-詹姆斯

在 AWS Device Farm 中，如果摄像头变黑，这意味着什么？

In AWS Device Farm if camera goes black, what it means?

preview

cordova

aws-device-farm

cordova-plugin-camera