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POReading a video with openCV
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  1. POReading a video with openCV
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    copied!<p>I have a video <strong>engine2.avi</strong> that I want to read and show with openCV. Here's my code:</p> <pre><code>#include &lt;opencv2/core/core.hpp&gt; #include &lt;opencv2/highgui/highgui.hpp&gt; #include &lt;iostream&gt; using namespace cv; int main(int argc, char** argv) { string filename = "D:\\BMDvideos\\engine2.avi"; VideoCapture capture(filename); Mat frame; if( !capture.isOpened() ) throw "Error when reading steam_avi"; namedWindow("w", 1); for( ; ; ) { capture &gt;&gt; frame; //if(!frame) // break; imshow("w", frame); waitKey(20); // waits to display frame } waitKey(0); } </code></pre> <p>This code doesn't work if my file has the codec <code>YUV 4:2:2 (UYVY)</code> (I recorded the video using Direct-Show), but works when I use a video I grabbed whit openCV !!</p> <p>Has anybody an Idea how this could work ? </p> <p><strong>UPDATE:</strong></p> <p>After reading some links, suggesting that catching exception will solve the problem, I modified my code. It didn't help, but here is the modified code:</p> <pre><code>cv::VideoCapture cap("d:\\BMDvideos\\engine2.avi"); cv::Mat frame; try { cap &gt;&gt; frame; } catch(cv::Exception ex) { std::cout &lt;&lt; ex.what() &lt;&lt; std::endl; } catch(...) { std::cout &lt;&lt; "Unknown exception" &lt;&lt; std::endl; } </code></pre> <p>The program crashes in <code>cap&gt;&gt;frame</code>. I readed similar questions but they use a frame in YUV (4:2:0), while my video has UYVY (4:2:2). How can I convert this into RGB color model?</p> <p><strong>UPDATE 2:</strong> </p> <p>After karlphillip's suggestion, I used OpenCV2.4.3, but I still got the same error using the code below:</p> <pre><code>#include &lt;opencv2\core\core.hpp&gt; #include &lt;opencv2\highgui\highgui.hpp&gt; #include &lt;opencv2\opencv.hpp&gt; using namespace cv; using namespace std; int main(){ cv::Mat frame; cv::VideoCapture cap("d:\\BMDvideos\\B\\Aufnahme.avi"); if(!cap.isOpened()) { cout &lt;&lt; "Error can't find the file"&lt;&lt;endl; } while(1){ if(!cap.read(frame)) imshow("",frame); cv::waitKey(33); } return 0; } </code></pre>
 

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