Databases
StackOverflow2013
Postsdbo
POOpenCV program freezes after several seconds of execution
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POOpenCV program freezes after several seconds of execution
    primarykey
    data
    text
    <p>I am running a program in C++ with OpenCV that reads a camera image and then does some stuff. The camera operates at 15 FPS if I just let it run as fast as it can. I am trying to use a camera to regulate the FPS to a number of my choosing, like 10 FPS. I am using a timer to do this (a timespec object and a clock_gettime() function call). The clock running by itself works fine, and the camera will run fine by itself, but when I try to grab a frame every 100 ms on my own, the program will run for roughly 3 seconds, and then freeze completely. This is the while loop in my code:</p> <pre><code>/* Start the timer */ clock_gettime(CLOCK_REALTIME, &amp;ts); startBit = ts.tv_nsec; /* Show the image captured from the camera in the window and repeat */ while (1) { // main while loop clock_gettime(CLOCK_REALTIME, &amp;ts); endBit = ts.tv_nsec; if (endBit-startBit &gt;= 100000000) { // &gt; 100 ms fprintf(stderr, "%lu\n", endBit-startBit); clock_gettime(CLOCK_REALTIME, &amp;ts); startBit = ts.tv_nsec; // reset timer IplImage* frame = cvQueryFrame(capture); // Get one frame Mat limage(frame); // convert IplImage to Mat if (!frame) { fprintf(stderr, "ERROR: frame is null...\n"); getchar(); break; } cvWaitKey(90); } } </code></pre> <p>The program will print to the console the time that has passed. The way it is set up now it should print something close to 100 ms (100000000 ns) all the time. But the console gives a weird number once per second: 18446744072800674356. As I mentioned before, commenting out the camera image code, the timer works fine on its own (it still prints out that huge number, but it will run forever). And if I comment out the timer code, the camera will run at 15 FPS with no problems. However, when I run the code together, it freezes after about 3 seconds. Any help is appreciated!</p>
    singulars
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PTQuestion
    1. USKara
    1. USkeithbhunter
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. CODoes it work if you put `cvWaitKey(90)` right outside the if statement? (see http://opencv.willowgarage.com/wiki/documentation/c/highgui/WaitKey)
      singulars
      1. POOpenCV program freezes after several seconds of execution
      1. USJong Bor Lee
    2. CONo, it behaves the same way with cvWaitKey() inside or outside the if statement.
      singulars
      1. POOpenCV program freezes after several seconds of execution
      1. USkeithbhunter
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload