I wanna get frames from my ip camera but same errors occured. I read some web page about that error but i couldnt solve the problem. I am using visual C++ 2010
Code :
cv::VideoCapture capture("rtsp://192.168.0.18:554/ucast/11");
if (!capture.isOpened()) return 1;
double width = capture.get(CV_CAP_PROP_FRAME_WIDTH);
double height = capture.get(CV_CAP_PROP_FRAME_HEIGHT);
cv::namedWindow("showRTSP", CV_WINDOW_AUTOSIZE);
while (true) {
cv::Mat frame;
if (!capture.read(frame)) break;
cv::imshow("showRTSP", frame);
if (cv::waitKey(30) == 27) break;
}
Errors : [h264 # 00000000030afaa0] error while decoding MB 59 10
thanks...
Related
I'm attempting to read an Azure Kinect recording and save images from the frames. But, it is not possible to set the color_format, which causes problems when using imwrite.
I have read the recording documentation here: https://learn.microsoft.com/en-us/azure/Kinect-dk/azure-kinect-recorder.
By default, the format seems to be K4A_IMAGE_FORMAT_COLOR_MJPG. But I am unsure what parameter to pass in when creating the material. For BGRA32 it is CV_8UC4 and for depth images it is CV_16U.
I assume there are two ways to solve this problem, either by setting the color_format or figuring out what parameter is correct for the default format made by the recording.
You can access the rgb with OpenCV as if it were a normal webcam:
VideoCapture cap(0); // open the default camera
cap.set(CV_CAP_PROP_FRAME_WIDTH, 3840);
cap.set(CV_CAP_PROP_FRAME_HEIGHT, 2160);
if (!cap.isOpened()) // check if we succeeded
return -1;
Mat frame, img;
for (;;)
{
cap >> frame; // get a new frame from camera
cout << frame.cols << " x " << frame.rows << endl;
resize(frame, img, Size(), 0.25, 0.25);
imshow("frame", img);
if (waitKey(30) >= 0) break;
}
No k4a function is called, no need to set the color format.
If you want to use their SDK with jpeg format, they provide a function in one of their sample codes:
long WriteToFile(const char *fileName, void *buffer, size_t bufferSize)
{
cout << bufferSize << endl;
assert(buffer != NULL);
std::ofstream hFile;
hFile.open(fileName, std::ios::out | std::ios::trunc | std::ios::binary);
if (hFile.is_open())
{
hFile.write((char *)buffer, static_cast<std::streamsize>(bufferSize));
hFile.close();
}
std::cout << "[Streaming Service] Color frame is stored in " << fileName << std::endl;
return 0;
}
You just call:
image = k4a_capture_get_color_image(capture);
WriteToFile("color.jpg", k4a_image_get_buffer(image), k4a_image_get_size(image));
Finally, you can set the format to RGBA32:
config.color_format = K4A_IMAGE_FORMAT_COLOR_BGRA32;
and convert it into a OpenCV Mat:
color_image = k4a_capture_get_color_image(capture);
if (color_image)
{
uint8_t* buffer = k4a_image_get_buffer(color_image); // get raw buffer
cv::Mat colorMat(Hrgb, Wrgb, CV_8UC4, (void*)buffer, cv::Mat::AUTO_STEP);
//do something with colorMat
k4a_image_release(color_image);
}
More details on the last option here: How to convert k4a_image_t to opencv matrix? (Azure Kinect Sensor SDK)
The data is slightly better with the last solution, but the buffer is significantly larger (33M vs ~1.5M) for 3840x2160.
Hi guys below is my code and i am getting error in create(const String& TrackerMIL), i am getting error as in this link exactly https://pastebin.com/0x52tJL6,, please help, for you all to know i have added extra module opencv_contrib in opencv3. please help guys. Thanks
#include <opencv2/opencv.hpp>
#include <opencv2/tracking/tracking.hpp>
using namespace cv;
using namespace std;
int main(int argc, char **argv)
{
// Set up tracker.
// Instead of MIL, you can also use
// BOOSTING, KCF, TLD, MEDIANFLOW or GOTURN
Ptr<Tracker> Tracker::create( const String& TrackerMIL );
// Read video
VideoCapture video("videos/chaplin.mp4");
// Check video is open
if(!video.isOpened())
{
cout << "Could not read video file" << endl;
return 1;
}
// Read first frame.
Mat frame;
video.read(frame);
// Define an initial bounding box
Rect2d bbox(287, 23, 86, 320);
// Uncomment the line below if you
// want to choose the bounding box
// bbox = selectROI(frame, false);
// Initialize tracker with first frame and bounding box
tracker->init(frame, bbox);
while(video.read(frame))
{
// Update tracking results
tracker->update(frame, bbox);
// Draw bounding box
rectangle(frame, bbox, Scalar( 255, 0, 0 ), 2, 1 );
// Display result
imshow("Tracking", frame);
int k = waitKey(1);
if(k == 27) break;
}
return 0;
}
this is solved after including headers properly specially for the above error where it was not able to find my libopencv_tracking.so.3.2,, i had to sudo apt-get update and sudo apt-get upgrade .. and now its working all fine ,,
thanks
i am trying capture a video from webcam. But i am always getting a 441 byte size file getting created.
Also in console there is error coming
OpenCVCMD[37317:1478193] GetDYLDEntryPointWithImage(/System/Library/Frameworks/AppKit.framework/Versions/Current/AppKit,_NSCreateAppKitServicesMenu) failed.
Code Snippet
void demoVideoMaker() {
//Camera Input
VideoCapture cap(0);
vidoFeed = ∩
namedWindow("VIDEO", WINDOW_AUTOSIZE);
//Determine the size of inputFeed
Size inpFeedSize = Size((int) cap.get(CV_CAP_PROP_FRAME_WIDTH), // Acquire input size
(int) cap.get(CV_CAP_PROP_FRAME_HEIGHT));
cout<<"Input Feed Size: "<<inpFeedSize<<endl;
VideoWriter outputVideo;
char fName[] = "capturedVid.avi";
outputVideo.open(fName, CV_FOURCC('P','I','M','1'), 20, inpFeedSize, true);
if (!outputVideo.isOpened()) {
cout<<"Failed to write Video"<<endl;
}
//Event Loop
Mat frame;
bool recordingOn = false;
while(1){
//Process user input if any
char ch = char(waitKey(10));
if (ch == 'q') {
break;
}if (ch == 'r') {
recordingOn = !recordingOn;
}
//Move to next frame
(*vidoFeed)>>frame;
if (frame.empty()) {
printf("\nEmpty Frame encountered");
}else {
imshow("VIDEO", frame);
if(recordingOn) {
cout<<".";
outputVideo.write(frame);
}
}
}
}
I am using opencv2.4, XCode 8.2 on mac OS Sierra 10.12.1
Tried changing the codec, fps, but nothing helped. I was assuming this would be a straight forward task but got stuck here. Please help.
This program captures video until I press Esc. But I need to modify this program and capture video for 30s.
After recording the video it plays very fast and the video length reduces. I tried to add waitKey at the end, but it still doesn't work. After recording the video length should be the same. How can I do that? Any suggestions?
int main( int argc, const char** argv )
{
using namespace std;
using namespace cv;
VideoCapture cap(0);
while(!(cap.isOpened() && cap.grab()))
{
cout << "Camera not ready" << endl;
}
VideoWriter Writer("D:/MyVideo.avi", CV_FOURCC('P','I','M','1'),20,Size(640,480), true);
while (waitKey(30)!= 27)
{
Mat frame;
cap >> frame;
Writer.write(frame);
imshow("D:/MyVideo", frame);
}
}
int64 t0 = cv::getTickCount();
while (waitKey(30)!= 27)
{
Mat frame;
cap >> frame; // read a new frame from video
Writer.write(frame); //writer the frame into the file
double t = (cv::getTickCount() - t0) / cv::getTickFrequency();
if (t > 30)
break;
...
// now, we need to adjust to the desired framerate of 20fps,
// so we need to sleep for 1000/20 = 50 milliseconds
// either have a window, and use waitKey():
// imshow("lalala", frame);
// waitKey(50);
// or just sleep(), unfortunately system dependant ;(
// win:
// Sleep(50);
// linux, etc.:
// usleep(50);
}
I'm been trying to capture video from a cam and write it into an AVI file. I'm using Qt 4.8.2 with MSVC 2010 (x86) on Windows 7. I have 2 versions of the code: one using cv::Mat and the other using IplImage*. However, only the IplImage* version is working. Here's my code using cv::Mat:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
int main() {
VideoCapture* capture2 = new VideoCapture( CV_CAP_DSHOW );
Size size2 = Size(640,480);
int codec = CV_FOURCC('M', 'J', 'P', 'G');
VideoWriter* writer2 = new VideoWriter("video.avi",codec,15,size2);
int a = 100;
Mat frame2;
while ( a > 0 ) {
capture2->read(frame2);
writer2->write(frame2);
a--;
}
writer2->release();
capture2->release();
return 0;
}
And here's the code using IplImage*:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
int main() {
CvCapture* capture = cvCaptureFromCAM( CV_CAP_DSHOW );
CvSize size = cvSize(640,480);
int codec = CV_FOURCC('M', 'J', 'P', 'G');
CvVideoWriter* writer = cvCreateVideoWriter("video.avi",codec,15,size);
int a = 100;
while ( a > 0 ) {
IplImage* frame = cvQueryFrame( capture );
cvWriteToAVI(writer,frame);
a--;
}
cvReleaseVideoWriter(&writer);
cvReleaseCapture( &capture );
return 0;
}
It's basically the same, or at least it looks like the same thing to me. It reads 100 frames and should write them into "video.avi". It compiles and runs without errors, but the cv::Mat version doesn't write anything, and the IplImage* version works perfectly.
Does someone have any idea on what's going on?
The syntax in Opencv C++ reference is bit different, and here is a working code in C++.
I Just added imshow and waitkey, for checking you can remove them if you want.
int main()
{
VideoCapture* capture2 = new VideoCapture(CV_CAP_DSHOW);
Size size2 = Size(640, 480);
int codec = CV_FOURCC('M', 'J', 'P', 'G');
// Unlike in C, here we use an object of the class VideoWriter//
VideoWriter writer2("video_.avi", codec, 15.0, size2, true);
writer2.open("video_.avi", codec, 15.0, size2, true);
if (writer2.isOpened())
{
int a = 100;
Mat frame2;
while (a > 0)
{
capture2->read(frame2);
imshow("live", frame2);
waitKey(100);
writer2.write(frame2);
a--;
}
}
else
{
cout << "ERROR while opening" << endl;
}
// No Need to release the Writer as the distructor will called automatically
capture2->release();
return 0;
}
I had the same problem over and over again, and none of the solutions I found online helped.
Strange enough, the problem (identified purely with a trial and error method) was with the write permission. Everything worked after I sudo chmod u+rwx the python script.
I have the same problem and after a few time i realize that the input video isn't the same size with the output. Resize the input video may help u.
capture2->read(frame2);
cv::resize(frame2,frame2,cv::Size(640,480);
writer2->write(frame2);