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• JavaCV Fetch RTSP Meet "avcodec_open2() error -40 : Could not open audio codec" Error

  6 avril 2019, par Jeremy Lu

  I am trying to use javacv to fetch a rtsp monitoring camera and grabber the frames, but meet "avcodec_open2() error -40 : Could not open audio codec" error when the grabber is prepare to start after setup the parameters.

  Javacv version :

  • org.bytedeco.javacv-platform, 1.4.1
  • org.bytedeco.javacpp-presets.opencv-platform, 3.4.1-1.4.1

  Here is the Jave Exception Infomation :

  org.bytedeco.javacv.FrameGrabber$Exception: avcodec_open2() error -40: Could not open audio codec.  
  
    at org.bytedeco.javacv.FFmpegFrameGrabber.startUnsafe(FFmpegFrameGrabber.java:835) ~[javacv-1.4.1.jar:1.4.1]  
  
    at org.bytedeco.javacv.FFmpegFrameGrabber.start(FFmpegFrameGrabber.java:663) ~[javacv-1.4.1.jar:1.4.1]  

  rtsp infomation :
  For the rtsp source, I also tried to download the FFplay and use command

  .\ffplay.exe -rtsp_transport tcp rtsp://admin:DWUUUP@10.193.8.71

  to show the frames from monitoring camera, and it works, and with following information

  • Input #0, rtsp, from ’rtsp ://admin:DWUUUP@10.193.8.71’ :

    • Metadata :
      • title : Media Presentation
    • Duration : N/A, start : 0.000000, bitrate : N/A
      • Stream #0:0 : Video : h264 (Main), yuvj420p(pc, bt709, progressive), 1920x1080 [SAR 1:1 DAR 16:9], 15 fps, 24.17 tbr, 90k tbn, 30 tbc
      • Stream #0:1 : Audio : aac, 16000 Hz, 1 channels, fltp

  • [aac @ 000001fc123be880] Audio object type 0 is not implemented. Update your FFmpeg version to the newest one from Git. If the problem still occurs, it means that your file has a feature which has not been implemented.

  And here is the source code :

  FFmpegFrameGrabber grabber = new FFmpegFrameGrabber ("rtsp://admin:DWUUUP@10.193.8.71");
  
  grabber.setImageHeight(640);
  
  grabber.setImageWidth(360);
  
  grabber.setOption("rtsp_transport", "tcp");
  
  grabber.start(); // Where meet the problem
  
  
  
  Java2DFrameConverter converter = new Java2DFrameConverter();
  
  BufferedImage bufferedImage = converter.convert( grabber.grab() );
  
  ByteArrayOutputStream bateArrayOutputStream = new ByteArrayOutputStream();
  
  ImageIO.write(bufferedImage, "jpeg", bateArrayOutputStream);
  
  byte[] data = bateArrayOutputStream.toByteArray();
  
  bateArrayOutputStream.close();

  I have tested to change the rtsp to a mp4 file, the code can work.

  How can I fix this problem ? Thanks very much !

• How to fix "fatal error : x.264 no such file or directory"

  24 avril 2019, par user11340790

  I wrote a makefile which builds a C program attaching the x.264 header. After trying to execute the makefile in terminal I receive the fatal error :
"example.c line [line of #include ] x264.h no such file or directory". Below you can find the C code and makefile (located in the same folder, the library - containing the x264.pc file- is in the folder libx264 of the parent folder). I would be very grateful if you could help with the linkage.

  



  Makefile :

  



      CC = gcc

    CFLAGS = -c -Wall `export PKG_CONFIG_PATH=../libx264 && pkg-config            --cflags x264`
    LDFLAGS = -static `export PKG_CONFIG_PATH=../libx264 && pkg-config --libs --static libx264`


    all: Release

    Debug: CFLAGS += -g
    Debug: example

    Release: example

    test: example.o
        $(CC) -o example example.o $(LDFLAGS)

    test.o: example.c
        $(CC) $(CFLAGS) example.c -o example.o

    clean:
        rm -f example.o example


  



  example.c code

  



      #include 
    #include 
    int main( int argc, char **argv )
    {
        int width, height;
         return 0;
    }


  


• How to fix "fatal error : x.264 no such file or directory"

  24 avril 2019, par user11340790

  I wrote a makefile which builds a C program attaching the x.264 header. After trying to execute the makefile in terminal I receive the fatal error :
  "example.c line [line of #include ] x264.h no such file or directory". Below you can find the C code and makefile (located in the same folder, the library - containing the x264.pc file- is in the folder libx264 of the parent folder). I would be very grateful if you could help with the linkage.

  Makefile :

      CC = gcc
  
  
  
      CFLAGS = -c -Wall `export PKG_CONFIG_PATH=../libx264 && pkg-config            --cflags x264`
  
      LDFLAGS = -static `export PKG_CONFIG_PATH=../libx264 && pkg-config --libs --static libx264`
  
  
  
  
  
      all: Release
  
  
  
      Debug: CFLAGS += -g
  
      Debug: example
  
  
  
      Release: example
  
  
  
      test: example.o
  
          $(CC) -o example example.o $(LDFLAGS)
  
  
  
      test.o: example.c
  
          $(CC) $(CFLAGS) example.c -o example.o
  
  
  
      clean:
  
          rm -f example.o example

  example.c code

      #include 
  
      #include 
  
      int main( int argc, char **argv )
  
      {
  
          int width, height;
  
           return 0;
  
      }