videoCapture.isOpened() always is false!

[cgf120]

System Information

// example for java user
OpenCV version: 4.7.0
Operating System / Platform: Centos7 or Centos8 已安装ffmpeg
Compiler & compiler version: GLIBC 2.28
JAVA 1.8

Detailed description

videoCapture.isOpened() always is false!
使用centos8，videoCapture.isOpened()一直返回false，用centos7，报错defaultException异常:Handler dispatch failed; nested exception is java.lang.UnsatisfiedLinkError: /tmp/opencv_openpnp3982757882420087236/nu/pattern/opencv/linux/x86_64/libopencv_java460.so: /lib64/libm.so.6: version `GLIBC_2.27' not found (required by /tmp/opencv_openpnp3982757882420087236/nu/pattern/opencv/linux/x86_64/libopencv_java460.so)
代码：
OpenCV.loadLocally();
videoCapture = new VideoCapture(downFilePath); //downFilePath文件的绝对路径
videoCapture.open(downFilePath);
if (!videoCapture.isOpened()) {
return;
}

maven config：

<dependency>
  <groupId>org.openpnp</groupId>
  <artifactId>opencv</artifactId>
  <version>4.7.0-0</version>
</dependency>

Steps to reproduce

Issue submission checklist

• I report the issue, it's not a question
• I checked the problem with documentation, FAQ, open issues, forum.opencv.org, Stack Overflow, etc and have not found any solution
• I updated to the latest OpenCV version and the issue is still there
• There is reproducer code and related data files (videos, images, onnx, etc)

[cgf120]

ok, it need install ffmpeg;

[kerry-weic]

Hello, ffmpeg has been installed for centos7 in my system. But still report this error

Exception in thread "main" java.lang.reflect.InvocationTargetException
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:497)
        at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:49)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:107)
        at org.springframework.boot.loader.Launcher.launch(Launcher.java:58)
        at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:88)
Caused by: java.lang.UnsatisfiedLinkError: /tmp/opencv_openpnp7807027642332807811/nu/pattern/opencv/linux/x86_64/libopencv_java470.so: /usr/lib64/libm.so.6: version `GLIBC_2.27' not found (required by /tmp/opencv_openpnp7807027642332807811/nu/pattern/opencv/linux/x86_64/libopencv_java470.so)
        at java.lang.ClassLoader$NativeLibrary.load(Native Method)
        at java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1937)
        at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1822)
        at java.lang.Runtime.load0(Runtime.java:781)
        at java.lang.System.load(System.java:1098)
        at nu.pattern.OpenCV$LocalLoader.<init>(OpenCV.java:330)
        at nu.pattern.OpenCV$LocalLoader.<init>(OpenCV.java:326)
        at nu.pattern.OpenCV$LocalLoader$Holder.<clinit>(OpenCV.java:336)
        at nu.pattern.OpenCV$LocalLoader.getInstance(OpenCV.java:340)
        at nu.pattern.OpenCV.loadLocally(OpenCV.java:323)
        at com.test.SpringBootTest.main(SpringBootTest.java:15)
        ... 8 more

ffmpeg version info

[root@localhost test]# ffmpeg
ffmpeg version 3.4.13 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 4.8.5 (GCC) 20150623 (Red Hat 4.8.5-44)
  configuration: --prefix=/usr --bindir=/usr/bin --datadir=/usr/share/ffmpeg --docdir=/usr/share/doc/ffmpeg --incdir=/usr/include/ffmpeg --libdir=/usr/lib64 --mandir=/usr/share/man --arch=x86_64 --optflags='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic' --extra-ldflags='-Wl,-z,relro ' --extra-cflags=' ' --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libvo-amrwbenc --enable-version3 --enable-bzlib --disable-crystalhd --enable-fontconfig --enable-gcrypt --enable-gnutls --enable-ladspa --enable-libass --enable-libbluray --enable-libcdio --enable-libdrm --enable-indev=jack --enable-libfreetype --enable-libfribidi --enable-libgsm --enable-libmp3lame --enable-nvenc --enable-openal --enable-opencl --enable-opengl --enable-libopenjpeg --enable-libopus --disable-encoder=libopus --enable-libpulse --enable-librsvg --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libvorbis --enable-libv4l2 --enable-libvidstab --enable-libvpx --enable-libx264 --enable-libx265 --enable-libxvid --enable-libzvbi --enable-avfilter --enable-avresample --enable-libmodplug --enable-postproc --enable-pthreads --disable-static --enable-shared --enable-gpl --disable-debug --disable-stripping --shlibdir=/usr/lib64 --enable-libmfx --enable-runtime-cpudetect
  libavutil      55. 78.100 / 55. 78.100
  libavcodec     57.107.100 / 57.107.100
  libavformat    57. 83.100 / 57. 83.100
  libavdevice    57. 10.100 / 57. 10.100
  libavfilter     6.107.100 /  6.107.100
  libavresample   3.  7.  0 /  3.  7.  0
  libswscale      4.  8.100 /  4.  8.100
  libswresample   2.  9.100 /  2.  9.100
  libpostproc    54.  7.100 / 54.  7.100
Hyper fast Audio and Video encoder

[thomedw]

Hi,

This opencv was built with ffmpeg disabled.

[fiorenzino]

Hi,

could be re-builded with ffmpeg enabled?
To streaming video that's mandatary...

(or can you suggest how to build with ffmpeg?)

best regards