VideoCapture cannot open video file in Java

[opencv-pushbot]

Transferred from http://code.opencv.org/issues/4298

|| Bahramuidn Adil on 2015-04-28 05:17
|| Priority: High
|| Affected: branch 'master' (3.0-dev)
|| Category: java bindings
|| Tracker: Bug
|| Difficulty: Medium
|| PR: 
|| Platform: x64 / Windows

VideoCapture cannot open video file in Java

History

Bahramuidn Adil on 2015-04-28 05:20

OpenCV 3.0 VideoCapture doesn't open video file in Java, but there is no problem if open camera.
-   Target version set to 3.0

Maksim Shabunin on 2015-04-28 12:35

-   Category set to java bindings

[padilla0]

any solution?

[medloh]

I was able to open several .mp4 files using opencv 3.0 java bindings to VideoCapture, and successfully step through their frames and get metadata about each frame.

[padilla0]

i can see your code?

[medloh]

Using OpenCV 3.0 on windows:

        Mat matOrig = new Mat();
        VideoCapture capture = new VideoCapture("resources/Hummingbird.MP4");
        if( capture.isOpened()){
            while (true){  
                capture.read(matOrig);  
                // get some meta data about frame.              
                double fps = capture.get(Videoio.CAP_PROP_FPS);
                double frameCount = capture.get(Videoio.CAP_PROP_FRAME_COUNT);
                double h = capture.get(Videoio.CAP_PROP_FRAME_HEIGHT);
                double w = capture.get(Videoio.CAP_PROP_FRAME_WIDTH);
                double posFrames = capture.get(Videoio.CAP_PROP_POS_FRAMES);
                double posMsec = capture.get(Videoio.CAP_PROP_POS_MSEC);
                double speed = capture.get(Videoio.CAP_PROP_SPEED);
                if( !matOrig.empty() ) {
                    // do stuff
                }
            }
        }

[padilla0]

i don't know if the problem is my *.mp4 *.avi or *.mpg file but capture.isOpened() return false , any sugestion?

[medloh]

Try opening a few other video files, verify you're using the right path in the VideoCapture constructor. What OS/Platform/JDK versions are you using?

[padilla0]

ok, i'm with windows/ java 1.7 but don't worry, i load my files now with javacv , using FFmpegFrameGraber

[elitcenk]

You are missing the loading ffmpeg dll. If use 64 add opencv_ffmpeg300_64.dll. If you use 32 add opencv_ffmpeg300.dll. Add this the your code.

System.loadLibrary("opencv_ffmpeg300_64");

[alalek]

System.loadLibrary is not required.
Just put opencv_ffmpeg*.dll file(s) near opencv_java*.dll or update PATH environment variable which should point to opencv_ffmpeg*.dll

[SonnyBao]

I have same issue on Ubuntu.
I've tried to compile ffmpeg from source as shared lib. It creates some libav*.so, but OpenCV Java code still cannot open the mp4/avi file with no errror or warning.
What should I do?

[iamdarknight]

Add to path and restart terminal C:\opencv\opencv\build\x64\vc12\bin

[aritra1994]

I have issue on Ubuntu 17.04. When I amtrying to run my program it shows message

(DEBUG) try_init_v4l2 VIDIOC_QUERYCAP "/home/aritra/workspace/oopencv/horror.mp4": Inappropriate ioctl for device
Unable to stop the stream: Inappropriate ioctl for device

What should I do now?

[alalek]

There is missing backends for Video I/O in your OpenCV build.
Usage questions should go to Users OpenCV Q/A forum: http://answers.opencv.org

[aritra1994]

I have found that my video is not opening by VideoCapture. An the question asked here remain not appropriately answered
@alalek can you suggest me anything?

[alalek]

This tracker is for issues and bugs that needs fix in OpenCV. We don't process help requests here or investigate issues on users side.
Again, you need proper build of OpenCV with enabled Video I/O backends (ffmpeg or gstreamer). Refer to OpenCV build/installation tutorials at first. You need configuration something like this:

--   Video I/O:
--     DC1394 1.x:                  NO
--     DC1394 2.x:                  NO
--     FFMPEG:                      YES
--       avcodec:                   YES (ver 54.35.1)
--       avformat:                  YES (ver 54.20.4)
--       avutil:                    YES (ver 52.3.0)
--       swscale:                   YES (ver 2.1.1)
--       avresample:                NO
--     GStreamer:                   NO
--     OpenNI:                      NO
--     OpenNI PrimeSensor Modules:  NO
--     OpenNI2:                     NO
--     PvAPI:                       NO
--     GigEVisionSDK:               NO
--     Aravis SDK:                  NO
--     UniCap:                      NO
--     UniCap ucil:                 NO
--     V4L/V4L2:                    NO/YES
--     XIMEA:                       NO
--     Xine:                        NO
--     Intel Media SDK:             NO
--     gPhoto2:                     NO

[aritra1994]

I have configuration like this

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

But still getting message @alalek

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

[DanielEColi]

@aritra1994 I met similar questions like you when I try to open an mp4 video in an android app. But I failed in the step below:
-- Check if the system is big endian - little endian
-- Found ZLIB: F:/AndroidDev/android-ndk-r10d/platforms/android-21/arch-arm64/usr/lib/libz.so (found suitable version "1.2.3", minimum required is "1.2.3")
-- Checking for modules 'libavcodec;libavformat;libavutil;libswscale'
-- No package 'libavcodec' found
-- No package 'libavformat' found
-- No package 'libavutil' found
-- No package 'libswscale' found
-- Checking for module 'libavresample'
-- No package 'libavresample' found

-- Video I/O:
-- FFMPEG: YES (prebuilt binaries)
-- avcodec: NO
-- avformat: NO
-- avutil: NO
-- swscale: NO
-- avresample: NO

could you help me to get the result like you? I mean like below:
-- 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)

[rajithabhanuka]

Hi all,

I'm also facing the same issue,

on my mac code is working
windows also working

but once I put it to ec2 it is not working.

if (cap.isOpened()) {} always false, appreciate your help