video-capture

I need capture a video stream from my USB webcam, for this i use Opencv 2.4.6 for developing in Java. I follow the steps listed in here I add the "C:\opencv\build\java\x64" dir to my System PATH and include the "opencv-246.jar" file into my libraries on ECLIPSE. When y run the explame import org.opencv.core.Core; import org.opencv.core.CvType; import org.opencv.core.Mat; public class Main { public static void main(String[] args) { System.loadLibrary(Core.NATIVE_LIBRARY_NAME); Mat m = Mat.eye(3, 3, CvType.CV_8UC1); System.out.println("m = " + m.dump()); } } i get m = [1, 0, 0; 0, 1, 0; 0, 0, 1]

I just create simple graph to record video from a source Filter: SourceFilter ---> Muxer ---> FileWriter I can able to save video which come from SourceFilter to my local disk. But when i try to play the recorded video, it play in "slow motion" :-). It is sure that there is fps (frame persecond) problem. How can i fix it? any ideas? PS: To check if my SourceFilter give righ fps i simply create another graph: SourceFilter ---> Video Decoder ---> Video Renderer and it plays at right speed (fps) More Details: SourceFilter(*.mp4 file format) ---> Avi Mux Filter ---> File writer Filter This record

import cv2 import numpy as np cap = cv2.VideoCapture('traffic.avi') retval, frame = cap.read() print retval ================ RESTART: J:\Python For DIP\traffic_video.py ================ False >>> The Value of retval is always False, which means the video is not read by the command. It must be True to read frames. I don't know what to do. However when I use my default webcam it turns to be True. I tried many videos and the same problem appears. Note: I have installed the ffmpeg correctly. Note: This is not the full code, in this step I am only validating cap.read() either True or False This

I recently installed OpenCV 2.4.2 in Ubuntu 12.04. cap = VideoCapture(0) is working. but I can't grab frames from some video source. cap = VideoCapture("input.avi") img = cap.read() gives me a numpy with all zero elements. I have also installed ffmpeg 0.11, Latest snapshot of x264, v4l-0.8.8 (All are latest stable versions) cmake -D WITH_QT=ON -D WITH_FFMPEG=ON -D WITH_OPENGL=ON -D WITH_TBB=ON -D BUILD_EXAMPLES=OFF WITH_V4L=ON .. make sudo make install When I do cmake, I get this -- Detected version of GNU GCC: 46 (406) -- Found OpenEXR: /usr/lib/libIlmImf.so -- Looking for linux/videodev.h --

I tried to answer this in the original thread however SO would not let me. Hopefully someone with more authority can merge this into the original question. OK here is a more complete answer. First, setup the capture: // Create capture session self.captureSession = [[AVCaptureSession alloc] init]; [self.captureSession setSessionPreset:AVCaptureSessionPresetPhoto]; // Setup capture input self.inputDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo]; AVCaptureDeviceInput *captureInput = [AVCaptureDeviceInput deviceInputWithDevice:self.inputDevice error:nil]; [self

I am recording video with MediaRecorder. My code works fine on 2.3.3 but fails on 4.0.3. The issue is following: the code mediaRecorder.stop() throws the RuntimeExeption java.lang.RuntimeException: stop failed. at android.media.MediaRecorder.stop(Native Method) with LogCat message 04-05 15:10:51.815: E/MediaRecorder(15709): stop failed: -1007 UPDATE I've found, that MediaPlayer reports an error (via MediaPlayer.OnErrorListener) almost immediately after the start. Error code is 100 (media server died), extra -1007. UPDATE 2 Code to prepare the MediaRecorder c = Camera.open(); ... // Step 1: