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"Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter
21 novembre 2020, par batumanMy program is



int main(){
 cout << "Start the process" << endl;
 cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");
 cout << "Camera connection done!" << endl;
 cv::Mat image, small;
 //Output video
 cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
 int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));
 int fps = vcap.get(CV_CAP_PROP_FPS);
 cout << "fps " << fps << " ex " << ex << endl;
 cv::VideoWriter outputVideo;
 outputVideo.open("TEST.avi", ex/*CV_FOURCC('X', '2', '6', '4')*/, vcap.get(CV_CAP_PROP_FPS), S, true);
 if(!outputVideo.isOpened()){
 cout << "Could not open the output video for write" << endl;
 return -1;
 }

 for(;;){
 if(!vcap.read(image)){
 std::cout << "No frame" << std::endl;
 cv::waitKey(0);
 }

 cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);
 cv::imshow("Display", small);
 cv::waitKey(1);
 outputVideo.write(small);
 if(getkey() == '\n')
 break;
 }
 cout << "Camera release" << endl;
 outputVideo.release();
 vcap.release();
 image.release();
 small.release();
 return 0;
}
</int>


int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int>ex is 0 here.


I can record the TEST.avi, but can't be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is
"Could not demultiplex stream".


If I changed to



outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.



all have same problem.



If I set



outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);



I have error as
Opencv: FFMPEG iYUV is not supported with codec id 14


For



outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);


OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
 what(): /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function write



What could be wrong ? Is that my FFMPEG has problem ?


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"Could not demultiplex stream" in loading Video recorded by Opencv's VideoWriter
16 juin 2016, par batumanMy program is
int main(){
cout << "Start the process" << endl;
cv::VideoCapture vcap("rtsp://root:pass@192.168.0.90/axis-media/media.amp?camera=1");
cout << "Camera connection done!" << endl;
cv::Mat image, small;
//Output video
cv::Size S = cv::Size((int) vcap.get(CV_CAP_PROP_FRAME_WIDTH), (int) vcap.get(CV_CAP_PROP_FRAME_HEIGHT));
int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));
int fps = vcap.get(CV_CAP_PROP_FPS);
cout << "fps " << fps << " ex " << ex << endl;
cv::VideoWriter outputVideo;
outputVideo.open("TEST.avi", ex/*CV_FOURCC('X', '2', '6', '4')*/, vcap.get(CV_CAP_PROP_FPS), S, true);
if(!outputVideo.isOpened()){
cout << "Could not open the output video for write" << endl;
return -1;
}
for(;;){
if(!vcap.read(image)){
std::cout << "No frame" << std::endl;
cv::waitKey(0);
}
cv::resize(image, small, image.size()/2, 0, 0 , cv::INTER_LINEAR);
cv::imshow("Display", small);
cv::waitKey(1);
outputVideo.write(small);
if(getkey() == '\n')
break;
}
cout << "Camera release" << endl;
outputVideo.release();
vcap.release();
image.release();
small.release();
return 0;
}
</int>int ex = static_cast<int>(vcap.get(CV_CAP_PROP_FOURCC));</int>ex is 0 here.I can record the TEST.avi, but can’t be read by cv::VideoCapture vcap("TEST.avi") ; or VLC player or Videos in Ubuntu.
The error is"Could not demultiplex stream".If I changed to
outputVideo.open("TEST.avi", CV_FOURCC('X', '2', '6', '4'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('P','I','M','1'), vcap.get(CV_CAP_PROP_FPS), S, true);
outputVideo.open("TEST.avi", CV_FOURCC('M', 'P', '4', '2'), vcap.get(CV_CAP_PROP_FPS), S, true);
etc.all have same problem.
If I set
outputVideo.open("TEST.avi", CV_FOURCC('i', 'Y', 'U', 'V'), vcap.get(CV_CAP_PROP_FPS), S, true);I have error as
Opencv: FFMPEG iYUV is not supported with codec id 14For
outputVideo.open("TEST.avi", CV_FOURCC('M', 'J', 'P', 'G'), vcap.get(CV_CAP_PROP_FPS), S, true);
OpenCV Error: Assertion failed (img.cols == width && img.rows == height && chann
els == 3) in write, file /home/Softwares/opencv/opencv/modules/videoio/src/
cap_mjpeg_encoder.cpp, line 829
terminate called after throwing an instance of 'cv::Exception'
what(): /home/Softwares/opencv/opencv/modules/videoio/src/cap_mjpeg_enco
der.cpp:829: error: (-215) img.cols == width && img.rows == height && channels =
= 3 in function writeWhat could be wrong ? Is that my FFMPEG has problem ?
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