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我在 ubuntu 17.04 中使用opencv 320 并简单地尝试计算 java 中给定视频的总帧数。这是我的代码。

    public class VideoAnalysis {

        public static void main (String [] args){

            System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
File f = new File("/home/aritra/workspace/oopencv/horror.mp4");
        boolean b = f.exists();

        System.out.println(b);

            VideoCapture capture = new VideoCapture("/home/aritra/workspace/oopencv/horror.mp4");

            if(!capture.isOpened()){
                System.out.println("could not open this file ");
            }
            else{
                System.out.println("length"+(capture.get(Videoio.CAP_PROP_FRAME_COUNT)));
            }

        }   
    }

我已将视频文件保留在项目中。每当我运行此程序时，它都会显示消息

    true
Failed to query video capabilities: Inappropriate ioctl for device
libv4l2: error getting capabilities: Inappropriate ioctl for device
VIDEOIO ERROR: V4L: device /home/aritra/workspace/oopencv/horror.mp4: Unable to query number of channels
could not open this file

但我的视频 I/O 状态是

Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  NO
--     FFMPEG:                      YES
--       avcodec:                   YES (ver 57.64.101)
--       avformat:                  YES (ver 57.56.101)
--       avutil:                    YES (ver 55.34.101)
--       swscale:                   YES (ver 4.2.100)
--       avresample:                YES (ver 3.1.0)
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     Aravis SDK:                  NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    Using libv4l1 (ver 1.12.3) / libv4l2 (ver 1.12.3)
--     XIMEA:                       NO
--     Xine:                        NO
--     gPhoto2:                     NO

我已经检查了OpenCV Constants.CaptureProperty并根据https://github.com/opencv/opencv/issues/6157使WITH_LIBV4L=ON但仍然收到这些消息。我应该怎么办？谁能帮我？

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