上周我买了'AVerMedia Capture Card（C985 LITE）'，我把摄像机连接到这个采集卡的HDMI输入端。
当我使用AVerMedia的RECentral软件Amcap，ffmpeg进行测试时，它确实有效。
但是，当我使用AVerMedia的AVerCapSDKDemo，VLC，Windows Movie制造商，Windows directshow进行测试时，它无效。
然后，我尝试通过互联网示例代码和我的c ++代码（使用和不使用openCV）获取相机帧（实时）。所有代码都适用于通用USB网络摄像头，但无法使用此捕获卡。 结果显示每个c ++代码都可以看到这个捕获卡，但看不到连接到卡的摄像头。
我测试过的条件不起作用，如下：
关于我的项目，我想实时跟踪道路上的汽车， 因此我决定使用支持全高清的C985采集卡。
有人有任何建议吗？
非常感谢。
致以最诚挚的问候，
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编辑：添加示例代码
1.我使用openCV的代码：对于此代码，它始终显示“错误：帧无法从网络摄像头读取\ n”。
#include<opencv2/core/core.hpp>
#include<opencv2/highgui/highgui.hpp>
#include<opencv2/imgproc/imgproc.hpp>
#include<iostream>
#include<conio.h>
int main() {
cv::VideoCapture capWebcam(0); // declare a VideoCapture object and associate to webcam, 0 => use 1st webcam
if (capWebcam.isOpened() == false) { // check if VideoCapture object was associated to webcam successfully
std::cout << "error: capWebcam not accessed successfully\n\n"; // if not, print error message to std out
_getch(); // may have to modify this line if not using Windows
return(0); // and exit program
}
char charCheckForEscKey = 0;
while (charCheckForEscKey != 27 && capWebcam.isOpened()) { // until the Esc key is pressed or webcam connection is lost
bool blnFrameReadSuccessfully = capWebcam.read(imgOriginal); // get next frame
if (!blnFrameReadSuccessfully || imgOriginal.empty()) { // if frame not read successfully
std::cout << "error: frame not read from webcam\n"; // print error message to std out
continue; // and jump out of while loop
}
cv::namedWindow("imgOriginal", CV_WINDOW_NORMAL); // note: you can use CV_WINDOW_NORMAL which allows resizing the window
cv::imshow("imgOriginal", imgOriginal); // show windows
charCheckForEscKey = cv::waitKey(1); // delay (in ms) and get key press, if any
} // end while
return(0);
}
2.我的代码没有openCV。 （使用AForge）：对于此代码，图像不显示任何内容。
private void Form1_Load(object sender, EventArgs e)
{
FilterInfoCollection videoDevices = new FilterInfoCollection(FilterCategory.VideoInputDevice);
for (int i = 0; i< videoDevices.Count; i++)
{
comboBox1.Items.Add(videoDevices[i].MonikerString);
}
// create video source
}
private void video_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
Bitmap img = (Bitmap)eventArgs.Frame.Clone();
pictureBox1.Image = img;
}
private void button1_Click(object sender, EventArgs e)
{
VideoCaptureDeviceForm xx = new VideoCaptureDeviceForm();
xx.ShowDialog();
VideoCaptureDevice videoSource = new VideoCaptureDevice(xx.VideoDeviceMoniker);
//videoSource.Source = "AVerMedia HD Capture C985 Bus 2";
VideoInput input = videoSource.CrossbarVideoInput;
MessageBox.Show("" + videoSource.CheckIfCrossbarAvailable());
MessageBox.Show(" " + input.Index + " " + input.Type);
// set NewFrame event handler
videoSource.NewFrame += video_NewFrame;
foreach(var x in videoSource.AvailableCrossbarVideoInputs)
{
MessageBox.Show("AvailableCrossbarVideoInputs > " + x.Index);
}
videoSource.VideoSourceError += VideoSource_VideoSourceError;
// start the video source
videoSource.Start();
// signal to stop when you no longer need capturing
videoSource.SignalToStop();
videoSource.Start();
MessageBox.Show("AvailableCrossbarVideoInputs length :" + videoSource.AvailableCrossbarVideoInputs.Length);
input = videoSource.CrossbarVideoInput;
MessageBox.Show(" " + input.Index + " " + input.Type);
videoSource.SignalToStop();
videoSource.Start();
}
3.来自互联网的代码：我在下面的链接中使用代码项目中的代码（从各种视频设备捕获实时视频）。它显示“无法检测网络摄像头”。
https://www.codeproject.com/articles/7123/capture-live-video-from-various-video-devices
答案 0 :(得分：1)
希望我的代码可以提供帮助:(我使用AVerMedia SDK + OpenCV3，使用directshow api打开设备然后获取视频到mat格式）
#include "stdafx.h"
#include "atlstr.h"
#include <iostream>
#include "AVerCapAPI_Pro.h"
#include "opencv2/core/core.hpp"
#include "opencv2/highgui/highgui.hpp"
#include <windows.h>
using namespace std;
using namespace cv;
void ErrorMsg(DWORD ErrorCode)
{
printf("ErrorCode = %d\n", ErrorCode);
if (ErrorCode == CAP_EC_SUCCESS)
{
printf("CAP_EC_SUCCESS\n");
}
if (ErrorCode == CAP_EC_INIT_DEVICE_FAILED)
{
printf("CAP_EC_INIT_DEVICE_FAILED\n");
}
if (ErrorCode == CAP_EC_DEVICE_IN_USE)
{
printf("CAP_EC_DEVICE_IN_USE\n");
}
if (ErrorCode == CAP_EC_NOT_SUPPORTED)
{
printf("CAP_EC_NOT_SUPPORTED\n");
}
if (ErrorCode == CAP_EC_INVALID_PARAM)
{
printf("CAP_EC_INVALID_PARAM\n");
}
if (ErrorCode == CAP_EC_TIMEOUT)
{
printf("CAP_EC_TIMEOUT\n");
}
if (ErrorCode == CAP_EC_NOT_ENOUGH_MEMORY)
{
printf("CAP_EC_NOT_ENOUGH_MEMORY\n");
}
if (ErrorCode == CAP_EC_UNKNOWN_ERROR)
{
printf("CAP_EC_UNKNOWN_ERROR\n");
}
if (ErrorCode == CAP_EC_ERROR_STATE)
{
printf("CAP_EC_ERROR_STATE\n");
}
if (ErrorCode == CAP_EC_HDCP_PROTECTED_CONTENT)
{
printf("CAP_EC_HDCP_PROTECTED_CONTENT\n");
}
}
BOOL WINAPI CaptureVideo(VIDEO_SAMPLE_INFO VideoInfo, BYTE *pbData, LONG lLength, __int64 tRefTime, LONG lUserData);
BOOL bGetData = FALSE;
Mat ans2;
int main(int argc, char** argv)
{
LONG lRetVal;
DWORD dwDeviceNum;
DWORD dwDeviceIndex = 0;
HANDLE hAverCapturedevice[10];
//Device Control
//1. Get Device Number
lRetVal = AVerGetDeviceNum(&dwDeviceNum);
if (lRetVal != CAP_EC_SUCCESS) {
printf("\nAVerGetDeviceNum Fail");
ErrorMsg(lRetVal);
system("pause");
}
if (dwDeviceNum == 0) {
printf("NO device found\n");
system("pause");
}
else {
printf("Device Number = %d\n", dwDeviceNum);
}
//2. Create device representative object handle
for (DWORD dwDeviceIndex = 0; dwDeviceIndex < dwDeviceNum; dwDeviceIndex++) {
lRetVal = AVerCreateCaptureObjectEx(dwDeviceIndex, DEVICETYPE_ALL, NULL, &hAverCapturedevice[dwDeviceIndex]);
if (lRetVal != CAP_EC_SUCCESS) {
printf("\nAVerCreateCaptureObjectEx Fail\n");
ErrorMsg(lRetVal);
system("pause");
}
else
printf("\nAVerCreateCaptureObjectEx Success\n");
}
//3. Start Streaming//
//3.1 set video source
//lRetVal = AVerSetVideoSource(hAverCapturedevice[0], 3);
lRetVal = AVerSetVideoSource(hAverCapturedevice[0], 3);
//3.2 set Video Resolution & FrameRate
VIDEO_RESOLUTION VideoResolution = { 0 };
INPUT_VIDEO_INFO InputVideoInfo;
ZeroMemory(&InputVideoInfo, sizeof(InputVideoInfo));
InputVideoInfo.dwVersion = 2;
Sleep(500);
lRetVal = AVerGetVideoInfo(hAverCapturedevice[0], &InputVideoInfo);
VideoResolution.dwVersion = 1;
VideoResolution.dwVideoResolution = VIDEORESOLUTION_1280X720;
lRetVal = AVerSetVideoResolutionEx(hAverCapturedevice[0], &VideoResolution);
lRetVal = AVerSetVideoInputFrameRate(hAverCapturedevice[0], 6000);
//3.3 Start Streaming
lRetVal = AVerStartStreaming(hAverCapturedevice[0]);
if (lRetVal != CAP_EC_SUCCESS) {
printf("\AVerStartStreaming Fail\n");
ErrorMsg(lRetVal);
//system("pause");
}
else
{
printf("\AVerStartStreaming Success\n");
//system("pause");
}
//4. Capture Single Image
#if 0
CAPTURE_IMAGE_INFO m_CaptureImageInfo = { 0 };
char text[] = "E:\Lena.bmp";
wchar_t wtext[20];
#define _CRT_SECURE_NO_WARNINGS
#pragma warning( disable : 4996 )
mbstowcs(wtext, text, strlen(text) + 1);//Plus null
LPWSTR m_strSavePath = wtext;
CAPTURE_SINGLE_IMAGE_INFO pCaptureSingleImageInfo = { 0 };
pCaptureSingleImageInfo.dwVersion = 1;
pCaptureSingleImageInfo.dwImageType = 2;
pCaptureSingleImageInfo.bOverlayMix = FALSE;
pCaptureSingleImageInfo.lpFileName = m_strSavePath;
//pCaptureSingleImageInfo.rcCapRect = 0;
lRetVal = AVerCaptureSingleImage(hAverCapturedevice[0], &pCaptureSingleImageInfo);
printf("\AVerCaptureSingleImage\n");
ErrorMsg(lRetVal);
#endif
#if 1
//video capture
VIDEO_CAPTURE_INFO VideoCaptureInfo;
ZeroMemory(&VideoCaptureInfo, sizeof(VIDEO_CAPTURE_INFO));
VideoCaptureInfo.bOverlayMix = FALSE;
VideoCaptureInfo.dwCaptureType = CT_SEQUENCE_FRAME;
VideoCaptureInfo.dwSaveType = ST_CALLBACK_RGB24;
VideoCaptureInfo.lpCallback = CaptureVideo;
VideoCaptureInfo.lCallbackUserData = NULL;
lRetVal = AVerCaptureVideoSequenceStart(hAverCapturedevice[0], VideoCaptureInfo);
if (FAILED(lRetVal))
{
return lRetVal;
}
//system("pause");// hange up
#endif
int i;
scanf_s("%d", &i, 4); //must input any number in console !!
//5. Stop Streaming
lRetVal = AVerCaptureVideoSequenceStop(hAverCapturedevice[0]);
lRetVal = AVerStopStreaming(hAverCapturedevice[0]);
//printf("\AVerStopStreaming Success\n");
ErrorMsg(lRetVal);
return 0;
}
BOOL WINAPI CaptureVideo(VIDEO_SAMPLE_INFO VideoInfo, BYTE *pbData, LONG lLength, __int64 tRefTime, LONG lUserData)
{
if (!bGetData)
{
ans2 = Mat(VideoInfo.dwHeight, VideoInfo.dwWidth, CV_8UC3, (uchar*)pbData).clone();//single capture image
//ans2 = Mat(VideoInfo.dwHeight, VideoInfo.dwWidth, CV_8UC3, (uchar*)pbData); //sequence capture image
bGetData = TRUE;
}
imshow("ans2", ans2);
waitKey(1);
return TRUE;
}
答案 1 :(得分：0)
现在，它已通过格式化计算机解决并安装了Windows 10 无需更新。
我写程序调用GraphEdit设置以下过滤器。
在我错误更新Windows之前，一切似乎都运行正常。
