96 lines
3.4 KiB
C++
96 lines
3.4 KiB
C++
#include <iostream> // for standard I/O
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#include <string> // for strings
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#include <opencv2/core.hpp> // Basic OpenCV structures (cv::Mat)
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#include <opencv2/videoio.hpp> // Video write
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using namespace std;
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using namespace cv;
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static void help()
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{
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cout
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<< "------------------------------------------------------------------------------" << endl
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<< "This program shows how to write video files." << endl
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<< "You can extract the R or G or B color channel of the input video." << endl
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<< "Usage:" << endl
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<< "./video-write <input_video_name> [ R | G | B] [Y | N]" << endl
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<< "------------------------------------------------------------------------------" << endl
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<< endl;
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}
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int main(int argc, char *argv[])
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{
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help();
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if (argc != 4)
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{
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cout << "Not enough parameters" << endl;
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return -1;
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}
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const string source = argv[1]; // the source file name
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const bool askOutputType = argv[3][0] =='Y'; // If false it will use the inputs codec type
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VideoCapture inputVideo(source); // Open input
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if (!inputVideo.isOpened())
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{
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cout << "Could not open the input video: " << source << endl;
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return -1;
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}
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string::size_type pAt = source.find_last_of('.'); // Find extension point
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const string NAME = source.substr(0, pAt) + argv[2][0] + ".avi"; // Form the new name with container
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int ex = static_cast<int>(inputVideo.get(CAP_PROP_FOURCC)); // Get Codec Type- Int form
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// Transform from int to char via Bitwise operators
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char EXT[] = {(char)(ex & 0XFF) , (char)((ex & 0XFF00) >> 8),(char)((ex & 0XFF0000) >> 16),(char)((ex & 0XFF000000) >> 24), 0};
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Size S = Size((int) inputVideo.get(CAP_PROP_FRAME_WIDTH), // Acquire input size
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(int) inputVideo.get(CAP_PROP_FRAME_HEIGHT));
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VideoWriter outputVideo; // Open the output
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if (askOutputType)
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outputVideo.open(NAME, ex=-1, inputVideo.get(CAP_PROP_FPS), S, true);
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else
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outputVideo.open(NAME, ex, inputVideo.get(CAP_PROP_FPS), S, true);
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if (!outputVideo.isOpened())
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{
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cout << "Could not open the output video for write: " << source << endl;
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return -1;
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}
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cout << "Input frame resolution: Width=" << S.width << " Height=" << S.height
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<< " of nr#: " << inputVideo.get(CAP_PROP_FRAME_COUNT) << endl;
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cout << "Input codec type: " << EXT << endl;
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int channel = 2; // Select the channel to save
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switch(argv[2][0])
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{
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case 'R' : channel = 2; break;
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case 'G' : channel = 1; break;
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case 'B' : channel = 0; break;
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}
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Mat src, res;
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vector<Mat> spl;
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for(;;) //Show the image captured in the window and repeat
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{
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inputVideo >> src; // read
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if (src.empty()) break; // check if at end
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split(src, spl); // process - extract only the correct channel
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for (int i =0; i < 3; ++i)
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if (i != channel)
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spl[i] = Mat::zeros(S, spl[0].type());
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merge(spl, res);
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//outputVideo.write(res); //save or
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outputVideo << res;
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}
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cout << "Finished writing" << endl;
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return 0;
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}
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