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• Frames from Video Using OpenCV in Ubuntu with Java 17

  2 août 2023, par bstrdn

  I've been trying to extract frames from a video using OpenCV in an Ubuntu environment with Java 17, but all my attempts have been unsuccessful so far. The main issue is that ffmpeg is not detected by the OpenCV library on ubuntu.

  


  Here's my test code :

  


  Main class

  


  import org.opencv.core.Core;
import org.opencv.videoio.VideoCapture;

public class Main {
  public static String videoPath = "";
  static {
    String osName = System.getProperty("os.name").toLowerCase();
    if (osName.contains("win")) {
      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
      videoPath = ClassLoader.getSystemResource("video.mp4").getPath();
    } else {
      videoPath = "/video.mp4";
//      System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
      System.load("/usr/lib/opencv_java470.so");
    }
  }

  public static void main(String[] args) throws InterruptedException {
    VideoCapture videoCapture = new VideoCapture(videoPath);
    if (!videoCapture.isOpened()) {
      System.out.println("Error opening video file.");
    } else {
      System.out.println("Everything is fine.");
    }
    System.out.println(Core.getBuildInformation());
    Thread.sleep(1000000000000000000L);
  }
}


  


  Maven :

  


  &lt;?xml version="1.0" encoding="UTF-8"?>&#xA;<project xmlns="http://maven.apache.org/POM/4.0.0">&#xA;  <modelversion>4.0.0</modelversion>&#xA;  <parent>&#xA;    <groupid>org.springframework.boot</groupid>&#xA;    <artifactid>spring-boot-starter-parent</artifactid>&#xA;    <version>3.0.2</version>&#xA;    <relativepath></relativepath> &#xA;  </parent>&#xA;  <groupid>org.example</groupid>&#xA;  <artifactid>untitled</artifactid>&#xA;  <version>1.0-SNAPSHOT</version>&#xA;  <properties>&#xA;    17&#xA;    17&#xA;    UTF-8&#xA;  </properties>&#xA;&#xA;<dependencies>&#xA;<dependency>&#xA;  <groupid>org.bytedeco</groupid>&#xA;  <artifactid>opencv-platform</artifactid>&#xA;  <version>4.7.0-1.5.9</version>&#xA;</dependency>&#xA;&#xA;<dependency>&#xA;  <groupid>org.springframework.boot</groupid>&#xA;  <artifactid>spring-boot-starter-web</artifactid>&#xA;</dependency>&#xA;</dependencies>&#xA;<build>&#xA;<plugins>&#xA;  <plugin>&#xA;    <groupid>org.springframework.boot</groupid>&#xA;    <artifactid>spring-boot-maven-plugin</artifactid>&#xA;  </plugin>&#xA;</plugins>&#xA;</build>&#xA;</project>&#xA;

  


  Dockerfile :

  


  FROM ubuntu:20.04
RUN apt-get update && apt-get install -y openjdk-17-jdk
RUN apt-get update && apt-get install -y pkg-config
RUN apt-get update && apt-get install -y ffmpeg libavformat-dev libavcodec-dev libswscale-dev libavresample-dev
ENV JAVA_HOME /usr/lib/jvm/java-17-openjdk-amd64
COPY target/*.jar /app.jar
COPY src/main/resources/video.mp4 /
COPY opencv_java470.so /usr/lib
ENV JAVA_TOOL_OPTIONS="-Djava.library.path=/usr/lib:/lib:/usr/local/lib:/usr/local:/usr/lib/x86_64-linux-gnu"
ENV LD_LIBRARY_PATH=/usr/lib:/lib:/usr/local/lib:/usr/local:/usr/lib/x86_64-linux-gnu
ENTRYPOINT [ "sh", "-c", "java $JAVA_TOOL_OPTIONS -jar /app.jar" ]


  


  The application displays the following text (video is not opened) :

  


  Error opening video file.

2023-08-02T13:30:58.448538297Z 
2023-08-02T13:30:58.448572597Z General configuration for OpenCV 4.7.0 =====================================
2023-08-02T13:30:58.448587327Z   Version control:               v4.7.0
2023-08-02T13:30:58.448590607Z 
2023-08-02T13:30:58.448593217Z   Platform:
2023-08-02T13:30:58.448596057Z     Timestamp:                   2023-03-27T23:13:34Z
2023-08-02T13:30:58.448598747Z     Host:                        Linux 5.4.0-1103-azure x86_64
2023-08-02T13:30:58.448601377Z     CMake:                       3.25.2
2023-08-02T13:30:58.448604277Z     CMake generator:             Unix Makefiles
2023-08-02T13:30:58.448606837Z     CMake build tool:            /usr/bin/make
2023-08-02T13:30:58.448609327Z     Configuration:               RELEASE
2023-08-02T13:30:58.448611867Z 
.......there is a lot of text......
2023-08-02T13:30:58.448772865Z 
2023-08-02T13:30:58.448775355Z   Video I/O:
2023-08-02T13:30:58.448777845Z     DC1394:                      NO
2023-08-02T13:30:58.448780535Z     FFMPEG:                      NO
2023-08-02T13:30:58.448783105Z       avcodec:                   NO
2023-08-02T13:30:58.448785725Z       avformat:                  NO
2023-08-02T13:30:58.448788295Z       avutil:                    NO
2023-08-02T13:30:58.448790755Z       swscale:                   NO
2023-08-02T13:30:58.448793295Z       avresample:                NO
2023-08-02T13:30:58.448795845Z     GStreamer:                   NO
2023-08-02T13:30:58.448798255Z     v4l/v4l2:                    YES (linux/videodev2.h)
2023-08-02T13:30:58.448800885Z 
2023-08-02T13:30:58.448803525Z   Parallel framework:            pthreads
2023-08-02T13:30:58.448806345Z 
............
2023-08-02T13:30:58.448859654Z   Java:                          export all functions
2023-08-02T13:30:58.448862024Z     ant:                         /usr/bin/ant (ver 1.10.5)
2023-08-02T13:30:58.448864504Z     JNI:                         /opt/hostedtoolcache/jdk/8.0.362/x64/include /opt/hostedtoolcache/jdk/8.0.362/x64/include/linux /opt/hostedtoolcache/jdk/8.0.362/x64/include
2023-08-02T13:30:58.448867224Z     Java wrappers:               YES
2023-08-02T13:30:58.448869804Z     Java tests:                  NO
2023-08-02T13:30:58.448872314Z 
2023-08-02T13:30:58.448874734Z   Install to:                    /usr/local


  


  Moreover, ffmpeg is installed on Ubuntu.

  


  How can i fix this ? I'm deathly tired(

  


  Thank you in advance for your assistance !

  


  First I tried installation following the official instructions.https://github.com/bytedeco/javacv#required-software

  


  Then the solution provided in https://stackoverflow.com/a/76750478/8087508,

  


  but the result is the same.

  


• ffmpeg command to use font on subtitle still uses the default one

  3 août 2023, par mika

  my command in python :

  


  ffmpegCommandAddSub = [
    'ffmpeg', '-i', input_video, '-vf', f"subtitles={input_srt}:force_style='Fontfile=Borel-Regular.ttf:fontsdir=./'",
    '-c:v', 'libx264', '-c:a', 'copy', output_video
]


  


  Borel-Regular.ttf is in the same folder as the python code

  


  the font is not applied to the subtitle. what am I doing wrong or didn't pay attention ?

  


  FFMPEG -version :

  


  ffmpeg version N-111432-g374184a4dc-20230714 Copyright (c) 2000-2023 the FFmpeg 

developers
built with gcc 13.1.0 (crosstool-NG 1.25.0.196_227d99d)
configuration: --prefix=/ffbuild/prefix --pkg-config-flags=--static --pkg-config=pkg-config --cross-prefix=x86_64-w64-mingw32- --arch=x86_64 --target-os=mingw32 --enable-gpl --enable-version3 --disable-debug --disable-w32threads --enable-pthreads --enable-iconv --enable-libxml2 --enable-zlib --enable-libfreetype 
--enable-libfribidi --enable-gmp --enable-lzma --enable-fontconfig --enable-libvorbis --enable-opencl --disable-libpulse --enable-libvmaf --disable-libxcb --disable-xlib --enable-amf --enable-libaom --enable-libaribb24 --enable-avisynth --enable-chromaprint --enable-libdav1d --enable-libdavs2 --disable-libfdk-aac --enable-ffnvcodec --enable-cuda-llvm --enable-frei0r --enable-libgme --enable-libkvazaar --enable-libass --enable-libbluray --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librist --enable-libssh --enable-libtheora --enable-libvpx --enable-libwebp --enable-lv2 --enable-libvpl --enable-openal --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenh264 --enable-libopenjpeg --enable-libopenmpt --enable-librav1e --enable-librubberband --enable-schannel --enable-sdl2 --enable-libsoxr --enable-libsrt --enable-libsvtav1 --enable-libtwolame --enable-libuavs3d --disable-libdrm --disable-vaapi --enable-libvidstab --enable-vulkan --enable-libshaderc --enable-libplacebo --enable-libx264 --enable-libx265 --enable-libxavs2 --enable-libxvid --enable-libzimg --enable-libzvbi --extra-cflags=-DLIBTWOLAME_STATIC --extra-cxxflags= --extra-ldflags=-pthread --extra-ldexeflags= --extra-libs=-lgomp --extra-version=20230714
libavutil      58. 14.100 / 58. 14.100
libavcodec     60. 22.100 / 60. 22.100
libavformat    60. 10.100 / 60. 10.100
libavdevice    60.  2.101 / 60.  2.101
libavfilter     9.  8.102 /  9.  8.102
libswscale      7.  3.100 /  7.  3.100
libswresample   4. 11.100 /  4. 11.100
libpostproc    57.  2.100 / 57.  2.100


  


• The error "Failed to query nvenc max version" typically occurs when using FFmpeg on Linux

  28 juillet 2023, par Well Chen

  The error "Failed to query nvenc max version" typically occurs when using FFmpeg with NVIDIA GPU acceleration (hevc_nvenc) on Linux.

  


  Does anyone know how to solve this bug ? Thank you very much.

  


  The following code is the FFmpeg code I entered, along with the output content.

  


  ffmpeg -ss 10:00 -i /www/wwwroot/pyffmpeg/videos/0/011.mp4 -t 20 -r 30 -b:v 4M -an -vcodec hevc_nvenc -y /www/wwwroot/pyffmpeg/videos/post/999.mp4
ffmpeg version 6.0 Copyright (c) 2000-2023 the FFmpeg developers
  built with gcc 8 (GCC)
  configuration: --extra-cflags='-I/usr/local/cuda/include -fPIC ' --extra-ldflags='-L/usr/local/cuda/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-cuvid --enable-nvenc --enable-nonfree --nvcc='nvcc=/usr/local/cuda-12.2/bin/nvcc'
  WARNING: library configuration mismatch
  avutil      configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avcodec     configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avformat    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avdevice    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  avfilter    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  swscale     configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  swresample  configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  postproc    configuration: --extra-cflags='-I/usr/local/cuda-12.2/include -fPIC ' --extra-ldflags='-L/usr/local/cuda-12.2/lib64 -ldl ' --pkg-config-flags=--static --enable-shared --enable-gpl --enable-libfreetype --enable-cuvid --enable-nvenc --enable-nonfree --nvcc=/usr/local/cuda-12.2/bin/nvcc --prefix=/usr/local/ffmpeg
  libavutil      58.  2.100 / 58.  2.100
  libavcodec     60.  3.100 / 60.  3.100
  libavformat    60.  3.100 / 60.  3.100
  libavdevice    60.  1.100 / 60.  1.100
  libavfilter     9.  3.100 /  9.  3.100
  libswscale      7.  1.100 /  7.  1.100
  libswresample   4. 10.100 /  4. 10.100
  libpostproc    57.  1.100 / 57.  1.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from '/www/wwwroot/pyffmpeg/videos/0/011.mp4':
  Metadata:
    major_brand     : isom
    minor_version   : 512
    compatible_brands: isomiso2avc1mp41
    encoder         : Lavf59.6.100
  Duration: 00:17:48.83, start: 0.000000, bitrate: 4617 kb/s
  Stream #0:0[0x1](und): Video: h264 (High) (avc1 / 0x31637661), yuv420p(tv, smpte170m/bt470bg/bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 4481 kb/s, 30 fps, 30 tbr, 15360 tbn (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
  Stream #0:1[0x2](und): Audio: aac (LC) (mp4a / 0x6134706D), 44100 Hz, stereo, fltp, 127 kb/s (default)
    Metadata:
      handler_name    : ISO Media file produced by Google Inc.
      vendor_id       : [0][0][0][0]
Stream mapping:
  Stream #0:0 -> #0:0 (h264 (native) -> hevc (hevc_nvenc))
Press [q] to stop, [?] for help
[hevc_nvenc @ 0x2a577790] Failed to query nvenc max version: unknown error (-756041696): (no details)
Segmentation faul


  


  I have installed FFmpeg, NVIDIA GPU drivers, and SDK. It works fine without using GPU acceleration, but it throws an error when using GPU acceleration.