Javacv: FFmpegFrameGrabber.start() stuck when provided url with no video

[feiyangsuo]

I was trying to pull some video from an address of myself, while there is not always a video being pushed in that address.
When there's no video stream in that address (or, as I tried, just provide a non-existing url for FFmpegFrameGrabber), FFmpegFrameGrabber.start() stuck. Was it trying to connect to the url permanently? Or maybe the connection was already established at the first time, but it's tring to find some video in vain?
I tried adding FFmpegFrameGrabber.setOption("stimeout", "10000000"); after creating the FFmpegFrameGrabber object, but it won't work and FFmpegFrameGrabber.start() stuck as before.
Here's my code:

import org.bytedeco.javacpp.Loader;
import org.bytedeco.javacv.*;
import org.bytedeco.ffmpeg.global.avutil;
import org.opencv.core.Mat;
import org.bytedeco.opencv.opencv_java;
import org.opencv.highgui.HighGui;
import javax.swing.*;
import java.util.Date;
import static org.opencv.imgcodecs.Imgcodecs.imwrite;

public class Main {
    static {Loader.load(opencv_java.class);}
    public static void main(String[] args) throws FrameGrabber.Exception {
        String path = "rtmp://play.aszn.org.cn/live/zcf";
        //String path = "rtmp://play.aszn.org.cn/JustNoVideoHere";
        FFmpegFrameGrabber mFrameGrabber = new FFmpegFrameGrabber(path);
        mFrameGrabber.setOption("stimeout", "10000000");
        mFrameGrabber.start();
        Frame mFrame;
        Mat mOpencvMat;
        while(true){
            mFrame = mFrameGrabber.grab();
            mOpencvMat = convert(mFrame);
            if(mOpencvMat != null){
                HighGui.imshow("Video", mOpencvMat);
                HighGui.waitKey(10);
            }
        }

    }

    private static Mat convert(Frame frame){
        OpenCVFrameConverter.ToOrgOpenCvCoreMat converter = new OpenCVFrameConverter.ToOrgOpenCvCoreMat();
        return converter.convert(frame);
    }
}

Help wanted! T_T

[saudet]

The correct option for RTMP is probably "rw_timeout":
https://ffmpeg.org/ffmpeg-protocols.html#Protocols

[feiyangsuo]

The correct option for RTMP is probably "rw_timeout":
https://ffmpeg.org/ffmpeg-protocols.html#Protocols

A thousand thanks to you! Problem is solved at once. Without your help I will be searching the internet whole day for Solution. Just brilliant of you.^_^