Can't open file when using VideoFileSource

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How to link FFmpeg? In lib has not FFmpeg? I have used java (https://github.com/bytedeco/ the same code has occurred.)

Using lib OpenCV in NDK has the same error.

no, the opencv4android sdk does not have ffmpeg. (no matter if you use c++ or java)

and we can't help you with javaCV, sorry.

No no, In my code, I have used OpenCV download form OpenCV page.

My codes using OpenCV for Android using NDK.

//1 prepear the input video and check it string input
        Ptr<VideoFileSource> source = makePtr<VideoFileSource>(sourcePath);Error here.
        cout << "Frame count (rough): " << source -> count() << endl;

        // 2 Prepare the motion estimator
        // first prepare the motion the estimation builder RANSAC L2;
        Ptr<MotionEstimatorRansacL2> est = makePtr<MotionEstimatorRansacL2>(MM_AFFINE);

        RansacParams ransac = est->ransacParams();
        ransac.size = RANSAC_SIZE;
        ransac.thresh = RANSAC_THESH;
        ransac.eps = RANSAC_EPS;

        est->setRansacParams(ransac);
        est->setMi

Error here.

that will call the code you show in you your question above. and the error says: the sourcepath is empty.

(the video codec problems will start only later)

No, sourcepath not empty

E/cv::error(): OpenCV(3.4.1) Error: No Error (can't open file: /storage/emulated/0/DCIM/Camera/patio.mp4) in virtual void cv::videostab::{anonymous}::VideoFileSourceImpl::reset(), file /build/master_pack-android/opencv/modules/videostab/src/frame_source.cpp, line 71

my code

String dcimFolder = StorageManager.getDCIMFolder();
        File videoFile = new File(dcimFolder, "Camera/patio.mp4");
        String outpath = new File(dcimFolder, "Camera/stab_patio.mp4").getAbsolutePath();
        if (videoFile.exists()) {
            VideoStab videoStab = VideoStab.getInstance();
            Log.e(">>>File Exist", videoFile.exists() + " canOpen:" + videoFile.canRead() + " path: " + videoFile.getAbsoluteFile());
            videoStab.videoStab(
                    videoFile.getAbsolutePath(),
                    outpath);
        }

Log check file video

07-14 02:33:06.233 E/>>>File Exist: true canOpen:true path: /storage/emulated/0/DCIM/Camera/patio.mp4

@break

How to do this.