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Opencv videowriter example

Use -h to get full help or, even better, run 'man ffmpeg'- I also check with: $ gst-inspect-1.0 | grep x264x264: x264enc: x264enc typefindfunctions: video/x-h264: h264, x264, 264To install OpenCV-C++ on iMX6UL-EVK, I do cross-compile: streaming, write image are okay, it's make sure OpenCV-C++ cross-compile is okay.This is my code:#include #include #include #include #include #include using namespace cv;using namespace std;int main(){ cout windowLength - 3 ) { //currentFrame.Resize(ratio, Emgu.CV.CvEnum.INTER.CV_INTER_CUBIC).Save(string.Format(@"frames/debug_{0}.jpg", frameNumber)); } // Update frame (current, gray and previous) try { currentFrame = cap.QueryFrame(); frameNumber++; //cap.SetCaptureProperty(Emgu.CV.CvEnum.CAP_PROP.CV_CAP_PROP_POS_FRAMES, frameNumber); //currentFrame = cap.QueryFrame(); previousFrameGray = currentFrameGray.Clone(); currentFrameGray = new Image(currentFrame.Bitmap); } catch (NullReferenceException) { break; } } //rw.Flush(); rw.Close(); //List emailText = new List(); //emailText.Add(string.Format("Finito con file {0}, PARAMS:Processed Frames: {1}", videoNameFile, frameToProcess)); //emailText.Add(string.Format("BlockDim: {0}", blockDim)); //emailText.Add(string.Format("N. particles per block: {0}", nParticles)); //emailText.Add(string.Format("Window Length: {0}", windowLength)); //emailText.Add(string.Format("SIGMA: {0}", SIGMA)); //emailText.Add(string.Format("State Matrix:{0} {1}{2} {3}", stateMat[0,0], stateMat[0,1], stateMat[1,0], stateMat[1,1])); //SendEmailAlert(emailText.ToArray()); } java.lang.Object org.opencv.videoio.VideoWriter public class VideoWriter extends Object Video writer class. The class provides C++ API for writing video files or image sequences. protected final long nativeObj protected VideoWriter(long addr) public VideoWriter(String filename, int apiPreference, int fourcc, double fps, Size frameSize, boolean isColor) The apiPreference parameter allows to specify API backends to use. Can be used to enforce a specific reader implementation if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_GSTREAMER. Parameters: filename - automatically generated apiPreference - automatically generated fourcc - automatically generated fps - automatically generated frameSize - automatically generated isColor - automatically generated public VideoWriter(String filename, int apiPreference, int fourcc, double fps, Size frameSize) The apiPreference parameter allows to specify API backends to use. Can be used to enforce a specific reader implementation if multiple are available: e.g. cv::CAP_FFMPEG or cv::CAP_GSTREAMER. Parameters: filename - automatically generated apiPreference - automatically generated fourcc - automatically generated fps - automatically generated frameSize - automatically generated public VideoWriter(String filename, int fourcc, double fps, Size frameSize, boolean isColor) Parameters: filename - Name of the output video file. fourcc - 4-character code of codec used to compress the frames. For example, VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G') is a motion-jpeg codec etc. List of codes can be obtained at [Video Codecs by FOURCC]( page. FFMPEG backend with MP4 container natively uses other values as fourcc code: see [ObjectType]( , so you may receive a warning message from OpenCV about fourcc code conversion. fps - Framerate of the created video stream. frameSize - Size of the video frames. isColor - If it is not zero, the encoder will expect and encode color frames, otherwise it will work with grayscale frames (the flag is currently supported on Windows only). Tips: With some backends fourcc=-1 pops up the codec selection dialog from the system. To save image sequence use a proper filename (eg. img_%02d.jpg) and fourcc=0 OR fps=0. Use uncompressed image format (eg. img_%02d.BMP) to save raw frames. Most codecs are lossy. If you want lossless video file you need to use a lossless codecs (eg. FFMPEG FFV1, Huffman HFYU, Lagarith LAGS, etc...) If FFMPEG is enabled, using codec=0; fps=0; you can create an uncompressed (raw) video file. public VideoWriter(String filename, int fourcc, double fps, Size frameSize) Parameters: filename - Name of the output video file. fourcc - 4-character code of codec used to compress the frames. For example, VideoWriter::fourcc('P','I','M','1') is a MPEG-1 codec, VideoWriter::fourcc('M','J','P','G') is a motion-jpeg codec etc. List of codes can be obtained at [Video Codecs by FOURCC]( page. FFMPEG backend with MP4 container natively uses other values as fourcc code: see [ObjectType]( , so you may receive a warning message from OpenCV about fourcc code conversion. fps - Framerate of the created video stream. frameSize - Size of the video frames. will work with grayscale frames (the flag is currently supported on Windows only). Tips: With some backends fourcc=-1 pops up the codec selection dialog from the system. To save image sequence use a proper filename (eg. img_%02d.jpg) and fourcc=0 OR fps=0. Use uncompressed image format (eg. img_%02d.BMP) to save raw frames. Most codecs are lossy. If you want lossless video file you need to use a lossless codecs (eg. FFMPEG FFV1, Huffman HFYU, Lagarith LAGS, etc...) If FFMPEG is enabled, using codec=0; fps=0; you can create an uncompressed (raw) video file. public VideoWriter() Default constructors The constructors/functions initialize video writers. On Linux FFMPEG is used to write videos; On Windows FFMPEG or VFW is used; On MacOSX QTKit is used. public long getNativeObjAddr() public static VideoWriter __fromPtr__(long addr) public String getBackendName() Returns used backend API name Note: Stream should be opened. Returns: automatically generated public boolean isOpened() Returns true if video writer has been successfully initialized. Returns: automatically generated public boolean open(String filename, int apiPreference, int fourcc, double fps, Size frameSize, boolean isColor) public boolean open(String filename, int apiPreference, int fourcc, double fps, Size frameSize) public boolean open(String filename, int fourcc, double fps, Size frameSize, boolean isColor) Initializes or reinitializes video writer. The method opens video writer. Parameters are the same as in the constructor VideoWriter::VideoWriter. Parameters: filename - automatically generated fourcc - automatically generated fps - automatically generated frameSize - automatically generated isColor - automatically generated Returns: true if video writer has been successfully initialized The method first calls VideoWriter::release to close the already opened file. public boolean open(String filename, int fourcc, double fps, Size frameSize) Initializes or reinitializes video writer. The method opens video writer. Parameters are the same as in the constructor VideoWriter::VideoWriter. Parameters: filename - automatically generated fourcc - automatically generated fps - automatically generated frameSize - automatically generated Returns: true if video writer has been successfully initialized The method first calls VideoWriter::release to close the already opened file. public boolean set(int propId, double value) Sets a property in the VideoWriter. Parameters: propId - Property identifier from cv::VideoWriterProperties (eg. cv::VIDEOWRITER_PROP_QUALITY) or one of REF: videoio_flags_others value - Value of the property. Returns: true if the property is supported by the backend used by the VideoWriter instance. public double get(int propId) Returns the specified VideoWriter property Parameters: propId - Property identifier from cv::VideoWriterProperties (eg. cv::VIDEOWRITER_PROP_QUALITY) or one of REF: videoio_flags_others Returns: Value for the specified property. Value 0 is returned when querying a property that is not supported by the backend used by the VideoWriter instance. public static int fourcc(char c1, char c2, char c3, char c4) Concatenates 4 chars to a fourcc code Parameters: c1 - automatically generated c2 - automatically generated c3 - automatically generated c4 - automatically generated Returns: a fourcc code This static method constructs the fourcc code of the codec to be used in the constructor VideoWriter::VideoWriter or VideoWriter::open. public void release() Closes the video writer. The method is automatically called by subsequent VideoWriter::open and by the VideoWriter destructor. public void write(Mat image) Writes the next video frame Parameters: image - The written frame. In general, color images are expected in BGR format. The function/method writes the specified image to video file. It must have the same size as has been specified when opening the video writer.

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