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• OpenCV 4.5.2 VideoWriter produces “can't find starting number” error

  28 avril 2021, par Peter Kronenberg

  There are several issues with similar names, but none of them seem to have a definitive answer. Using the last version of OpenCV 4.5.2 with Java on Windows 10. Below is a short reproducible test case which results in

  


  [ERROR:0] global C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\videoio\src\cap.cpp (589) cv::VideoWriter::open VIDEOIO(CV_IMAGES): raised OpenCV exception:

OpenCV(4.5.2) C:\build\master_winpack-bindings-win64-vc14-static\opencv\modules\videoio\src\cap_images.cpp:253: error: (-5:Bad argument) CAP_IMAGES: can't find starting number (in the name of file): C:/testfiles/output.avi in function 'cv::icvExtractPattern'


  


  Here is the code :

  


  public class OpenCVError {

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);

        final int fourcc = VideoWriter.fourcc('m', 'j', 'p', 'g');
        final double fps = 30.00;
        Size frameSize = new Size(1080, 1920);
        VideoWriter videoWriter = new VideoWriter("C:/testfiles/output.avi", fourcc, fps, frameSize, true);
    }
}


  


  Update

  


  Found out from https://forum.opencv.org/t/error-in-java-cant-find-starting-number-in-the-name-of-file/3014 that I seem to be missing opencv_videoio_ffmpeg452_64.dll
I am using the Maven distribution at

  


    <dependency>&#xA;            <groupid>org.openpnp</groupid>&#xA;            <artifactid>opencv</artifactid>&#xA;            <version>4.5.1-2</version>&#xA;  </dependency>&#xA;

  


  which doesn't appear to have this file. I tried adding the file to my classpath (using IntelliJ), but it still doesn't seem to work.

  


  Anyone have any ideas ? Why isn't this file part of the openpnp distribution ?

  


• ffmpeg - Merge two audios with different duration

  5 juin 2015, par Andrés

  Is it possible to merge two audio files with different duration (I don’t know which one is the longest) using ffmpeg’s amerge filter ?

  I don’t want to have a final audio only with the shortest duration, I need that the longest audio be complete too.

  I don’t want to use amix, it’s decreasing the volume of the audios.

• improve the performance of making slide video using ffmpeg

  1er juin 2018, par huynq9

  I have 10 images(1080x1920) and 2 video(1080x1920).
  I want to merge all of them to make a final video using command :

  INPUT_DATA=(_img1.jpg vid1.mp4 _img2.jpg vid2.mp4 _img3.jpg _img4.jpg _img5.jpg _img6.jpg _img7.jpg _img8.jpg _img9.jpg _img10.jpg)
  
  IMAGE_TIME_SPAN=5
  
  INPUT_DIR="input"
  
  OUTPUT_DIR="output"
  
  BACKGROUND_MUSIC="$INPUT_DIR/background.mp3"
  
  OUTPUT_STEP1="$OUTPUT_DIR/tmp_video.mp4"
  
  OUTPUT_STEP3="$OUTPUT_DIR/tmp_background.mp3"
  
  OUTPUT_FILE="$OUTPUT_DIR/final.mp4"
  
  SCALE_SIZE="1080x1920"
  
  
  
  ffmpeg -y \
  
      -f lavfi -t 1 -i anullsrc \
  
      -i $INPUT_DIR/${INPUT_DATA[0]} \
  
      -i $INPUT_DIR/${INPUT_DATA[1]} \
  
      -i $INPUT_DIR/${INPUT_DATA[2]} \
  
      -i $INPUT_DIR/${INPUT_DATA[3]} \
  
      -i $INPUT_DIR/${INPUT_DATA[4]} \
  
      -i $INPUT_DIR/${INPUT_DATA[5]} \
  
      -i $INPUT_DIR/${INPUT_DATA[6]} \
  
      -i $INPUT_DIR/${INPUT_DATA[7]} \
  
      -i $INPUT_DIR/${INPUT_DATA[8]} \
  
      -i $INPUT_DIR/${INPUT_DATA[9]} \
  
      -i $INPUT_DIR/${INPUT_DATA[10]} \
  
      -i $INPUT_DIR/${INPUT_DATA[11]} \
  
      -filter_complex \
  
      "[1:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img1]; \
  
       [2:v]fade=t=in:st=0:d=4:alpha=1,scale=$SCALE_SIZE[v1]; \
  
       [3:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img2]; \
  
       [4:v]fade=t=in:st=0:d=4:alpha=1,scale=$SCALE_SIZE[v2]; \
  
       [5:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img3]; \
  
       [6:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img4]; \
  
       [7:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img5]; \
  
       [8:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img6]; \
  
       [9:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img7]; \
  
       [10:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img8]; \
  
       [11:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img9]; \
  
       [12:v]fade=t=in:st=0:d=4:alpha=1,zoompan=z='zoom+0.0009':d=25*$IMAGE_TIME_SPAN:s=$SCALE_SIZE[img10]; \
  
       [img1][0:a][v1][0:a][img2][0:a][v2][0:a][img3][0:a][img4][0:a][img5][0:a][img6][0:a][img7][0:a][img8][0:a][img9][0:a][img10][0:a]concat=n=12:v=1:a=1" \
  
      -pix_fmt yuv420p -c:v libx264 \
  
      $OUTPUT_STEP1

  I run this command on a virtual machine (Linux, 4GB memories) and it takes 11 min to finish ! It takes too long and I want to reduce the process time to less than 5 min.

  Any suggestion for the better performance.