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Int frameW = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_WIDTH) ĬvNamedWindow( "video", CV_WINDOW_AUTOSIZE ) Int frameH = (int) cvGetCaptureProperty(capture, CV_CAP_PROP_FRAME_HEIGHT) Int fps = ( int )cvGetCaptureProperty( capture, CV_CAP_PROP_FPS ) Create opencvvideo_test.c // compile with gcc -ggdb `pkg-config -cflags -libs opencv` opencvvideo_test.c -o opencvvideo_testĬvCapture *capture = cvCreateFileCapture(argv) //cvCaptureFromAVI( argv ) Then read the data from the named pipe in opencv On Linux one may get mjpeg stream and convert it to mpeg4 and feed it to a named pipe. Option3: Using gstreamer, Named Pipe and opencv To save MJPEG stream as multiple images the pipeline (Let us put a vertical flip BIN and connect the PADS to the previous and the next BINS to make it fancier) gst-launch souphttpsrc location=" do-timestamp=true is_live=true ! multipartdemux ! jpegdec ! videoflip method=vertical-flip ! jpegenc ! multifilesink location=image-out-%05d.jpgĪlso maybe worthwhile have a look at gst-opencv To view MJPEG stream one may execute media pipeline string as follows gst-launch -v souphttpsrc location=" do-timestamp=true is_live=true ! multipartdemux ! jpegdec ! ffmpegcolorspace ! autovideosinkįor RTSP gst-launch -v rtspsrc debug=1 ! rtpmp4vdepay ! mpeg4videoparse ! ffdec_mpeg4 ! ffmpegcolorspace! autovideosinkįor a simple example take a look at my other post on rtsp for constructing gstreamer C API media pipeline (This is same as gst-launch string but rather implemented as a C API) I would recommend looking at gstreamer if your goal is to just view or save jpeg images To view mjpeg stream in opencv take a look at the following implementation Option1 : Using opencv, libcurl and libjpeg

I am sure you would have received an error similar to Could not find codec parameters (Video: mjpeg) However, ffmpeg decoder's MJPEG codec has a widely known unresolved issues. Is this an Axis IP camera? Either way, most IP cameras that provide MPEG4 RTSP stream that can be decoded using OpenCV using cvCreateFileCapture_FFMPEG.