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• Error while capturing video via RTSP from a network camera using OpenCV and FFMPEG

  29 octobre 2012, par Dídac Pérez

  I am using OpenCV and FFMPEG to capture frames from a network camera using RTSP. The point is that OpenCV successfully loads the FFMPEG .dll but icvCreateFileCapture_FFMPEG_p returns false in the following code of cap_ffmpeg.cpp :

  virtual bool open( const char* filename )
  
  {
  
      close();
  
  
  
      icvInitFFMPEG();
  
      if( !icvCreateFileCapture_FFMPEG_p )
  
          return false;
  
      ffmpegCapture = icvCreateFileCapture_FFMPEG_p( filename );
  
      return ffmpegCapture != 0;
  
  }

• fatal error : libavcodec/avcodec.h no such file or directory compilation terminated

  25 mai 2016, par user1625271

  I’m trying to execute tutorial01.c using gcc and I have the gcc and tutorial01.c in the same folder along with libavcodec and libavformat and its associated files it gives me this error

  fatal error : libavcodec/avcodec.h no such file or directory compilation terminated

  when I run gcc -o tutorial01 tutorial01.c -lavformat -lavcodec -lz through the terminal in ubuntu 12.04

  the code is

  #include  libavcodec/avcodec.h
  
  #include libavformat/avformat.h
  
  #include stdio.h
  
  
  
  void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame)
  
   {
  
    FILE *pFile;
  
    char szFilename[32];
  
    int  y;
  
  
  
    // Open file
  
    sprintf(szFilename, "frame%d.ppm", iFrame);
  
    pFile=fopen(szFilename, "wb");
  
    if(pFile==NULL)
  
      return;
  
  
  
    // Write header
  
    fprintf(pFile, "P6\n%d %d\n255\n", width, height);
  
    // Write pixel data
  
    for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
  
  
  
    // Close file
  
    fclose(pFile);
  
  }
  
  
  
  int main(int argc, char *argv[])
  
   {
  
    AVFormatContext *pFormatCtx;
  
    int             i, videoStream;
  
    AVCodecContext  *pCodecCtx;
  
    AVCodec         *pCodec;
  
    AVFrame         *pFrame; 
  
    AVFrame         *pFrameRGB;
  
    AVPacket        packet;
  
    int             frameFinished;
  
    int             numBytes;
  
    uint8_t         *buffer;
  
  
  
    if(argc < 2) 
  
    {
  
      printf("Please provide a movie file\n");
  
      return -1;
  
    }
  
  
  
    // Register all formats and codecs
  
    av_register_all();
  
    // Open video file
  
    if(av_open_input_file(&pFormatCtx, argv[1], NULL, 0, NULL)!=0)
  
      return -1; // Couldn't open file
  
  
  
    // Retrieve stream information
  
    if(av_find_stream_info(pFormatCtx)<0)
  
      return -1; // Couldn't find stream information
  
  
  
    // Dump information about file onto standard error
  
    dump_format(pFormatCtx, 0, argv[1], 0);
  
    // Find the first video stream
  
    videoStream=-1;
  
    for(i=0; inb_streams; i++)
  
      if(pFormatCtx->streams[i]->codec->codec_type==CODEC_TYPE_VIDEO)
  
      {
  
        videoStream=i;
  
        break;
  
      }
  
    if(videoStream==-1)
  
      return -1; // Didn't find a video stream
  
  
  
    // Get a pointer to the codec context for the video stream
  
    pCodecCtx=pFormatCtx->streams[videoStream]->codec;
  
    // Find the decoder for the video stream
  
    pCodec=avcodec_find_decoder(pCodecCtx->codec_id);
  
    if(pCodec==NULL) 
  
    {
  
      fprintf(stderr, "Unsupported codec!\n");
  
      return -1; // Codec not found
  
    }
  
  
  
    // Open codec
  
    if(avcodec_open(pCodecCtx, pCodec)<0)
  
      return -1; // Could not open codec
  
  
  
    // Allocate video frame
  
    pFrame=avcodec_alloc_frame();
  
  
  
    // Allocate an AVFrame structure
  
    pFrameRGB=avcodec_alloc_frame();
  
  
  
    if(pFrameRGB==NULL)
  
      return -1;
  
  
  
    // Determine required buffer size and allocate buffer              
  
   numBytes=avpicture_get_size(PIX_FMT_RGB24, pCodecCtx->width,
  
                    pCodecCtx->height);
  
  
  
    buffer=(uint8_t *)av_malloc(numBytes*sizeof(uint8_t));
  
  
  
    // Assign appropriate parts of buffer to image planes in pFrameRGB
  
    // Note that pFrameRGB is an AVFrame, but AVFrame is a superset
  
    // of AVPicture
  
    avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24,
  
           pCodecCtx->width, pCodecCtx->height);
  
  
  
    // Read frames and save first five frames to disk
  
    i=0;
  
    while(av_read_frame(pFormatCtx, &packet)>=0)
  
   {
  
      // Is this a packet from the video stream?
  
      if(packet.stream_index==videoStream) 
  
      {
  
        // Decode video frame
  
        avcodec_decode_video(pCodecCtx, pFrame, &frameFinished, 
  
                 packet.data, packet.size);
  
  
  
        // Did we get a video frame?
  
        if(frameFinished) 
  
        {
  
          // Convert the image from its native format to RGB
  
  
  
  
  
  
  
  
  
      img_convert((AVPicture *)pFrameRGB, PIX_FMT_RGB24, 
  
                      (AVPicture*)pFrame, pCodecCtx->pix_fmt, pCodecCtx->width, 
  
                      pCodecCtx->height);
  
  
  
  
  
  
  
  
  
      // Save the frame to disk
  
  
  
      if(++i<=5)
  
    SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, 
  
              i);
  
        }
  
     }
  
  
  
      // Free the packet that was allocated by av_read_frame
  
      av_free_packet(&packet);
  
    }
  
  
  
    // Free the RGB image
  
    av_free(buffer);
  
    av_free(pFrameRGB);
  
  
  
    // Free the YUV frame
  
    av_free(pFrame);
  
  
  
   // Close the codec
  
    avcodec_close(pCodecCtx);
  
  
  
  
  
    // Close the video file
  
    av_close_input_file(pFormatCtx);
  
  
  
  
  
    return 0;
  
  
  
  }

• Android- Error during executing Runtime.getRuntime().exec() - Environment Null -ffmpeg

  18 février 2015, par Chaitanya Chandurkar

  I have compiled ffmpeg library on ubuntu 11.10 and ported compiled files on android.
  After compiling i got libffmpeg.so successfully. It gets loaded on android successfully.

  I am doing it on ubuntu 11.10 eclipse android emulator.

  I have created a small test application which act as command prompt which accepts command from user and displays result. (testing ffmpeg commands)

  When i run simple commands like "ls", "ls -l" it works perfectly. but when i simply type "cd mnt" or "ffmpeg" as command and try to run it. I got Warnings in Logcat saying that

  08-26 16:44:52.553: W/System.err(5961): java.io.IOException: Error running exec(). Command: [ffmpeg] Working Directory: null Environment: null
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.ProcessManager.exec(ProcessManager.java:211)
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:168)
  
  08-26 16:44:52.573: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:241)
  
  08-26 16:44:52.583: W/System.err(5961):     at java.lang.Runtime.exec(Runtime.java:184)
  
  08-26 16:44:52.593: W/System.err(5961):     at ch.ffmpeg.reversit.MainActivity.Execute(MainActivity.java:61)
  
  08-26 16:44:52.593: W/System.err(5961):     at ch.ffmpeg.reversit.MainActivity$1.onClick(MainActivity.java:46)
  
  08-26 16:44:52.593: W/System.err(5961):     at android.view.View.performClick(View.java:3480)
  
  08-26 16:44:52.593: W/System.err(5961):     at android.view.View$PerformClick.run(View.java:13983)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Handler.handleCallback(Handler.java:605)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Handler.dispatchMessage(Handler.java:92)
  
  08-26 16:44:52.603: W/System.err(5961):     at android.os.Looper.loop(Looper.java:137)
  
  08-26 16:44:52.614: W/System.err(5961):     at android.app.ActivityThread.main(ActivityThread.java:4340)
  
  08-26 16:44:52.624: W/System.err(5961):     at java.lang.reflect.Method.invokeNative(Native Method)
  
  08-26 16:44:52.624: W/System.err(5961):     at java.lang.reflect.Method.invoke(Method.java:511)
  
  08-26 16:44:52.634: W/System.err(5961):     at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784)
  
  08-26 16:44:52.634: W/System.err(5961):     at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551)
  
  08-26 16:44:52.644: W/System.err(5961):     at dalvik.system.NativeStart.main(Native Method)
  
  08-26 16:44:52.644: W/System.err(5961): Caused by: java.io.IOException: Permission denied
  
  08-26 16:44:52.674: W/System.err(5961):     at java.lang.ProcessManager.exec(Native Method)
  
  08-26 16:44:52.674: W/System.err(5961):     at java.lang.ProcessManager.exec(ProcessManager.java:209)
  
  08-26 16:44:52.684: W/System.err(5961):     ... 16 more

  Here is my code :

  imports;
  
  public class MainActivity extends Activity {
  
      String com;
  
      Process process;
  
      EditText command;
  
      Button run;
  
      RelativeLayout main_layout;
  
  
  
      static {
  
       System.loadLibrary("ffmpeg");
  
      }
  
  
  
      /** Called when the activity is first created. */
  
      @Override
  
      public void onCreate(Bundle savedInstanceState) {
  
          super.onCreate(savedInstanceState);
  
          setContentView(R.layout.activity_main);
  
  
  
         //find view 
  
         command=(EditText)findViewById(R.id.command);
  
         run=(Button)findViewById(R.id.run);
  
  
  
          run.setOnClickListener(new OnClickListener() {
  
              public void onClick(View v) {
  
                  com=command.getText().toString();
  
                  try {
  
                      Execute();
  
                  } catch (IOException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  } catch (InterruptedException e) {
  
                      // TODO Auto-generated catch block
  
                      e.printStackTrace();
  
                  }
  
  
  
              }
  
          }); 
  
  
  
      }
  
  
  
      public void Execute() throws IOException, InterruptedException{
  
          process=Runtime.getRuntime().exec(com);
  
          // process = pb.command(com).redirectErrorStream(true).start();
  
  
  
          if(process!=null)
  
          ShowOutput();
  
          else
  
          Toast.makeText(getBaseContext(),"Null Process",Toast.LENGTH_LONG).show();
  
      }
  
  
  
      public void ShowOutput() throws IOException, InterruptedException{
  
          String s,text="",errors="";
  
          BufferedReader stdInput = new BufferedReader(new 
  
                  InputStreamReader(process.getInputStream()));
  
  
  
             BufferedReader stdError = new BufferedReader(new 
  
                  InputStreamReader(process.getErrorStream()));
  
  
  
  
  
             TextView output=(TextView)findViewById(R.id.output);
  
             TextView error=(TextView)findViewById(R.id.error);
  
  
  
              while ((s = stdInput.readLine()) != null) {
  
                     text+=s.toString()+"\n";
  
                     System.out.println("Error: "+s);
  
                 }
  
  
  
           output.setText(text);
  
           text="";
  
             // read any errors from the attempted command
  
             System.out.println("Here is the standard error of the command (if any):\n");
  
             while ((s = stdError.readLine()) != null) {
  
                 text+=s.toString()+"\n";
  
                 System.out.println("Error: "+s);
  
             }
  
  
  
             error.setText(text);
  
  
  
             error.setMovementMethod(new ScrollingMovementMethod());
  
             output.setMovementMethod(new ScrollingMovementMethod());
  
  
  
             stdInput.close();
  
             stdError.close();
  
  
  
             process.waitFor();
  
             process.getOutputStream().close();
  
             process.getInputStream().close();
  
             process.getErrorStream().close(); 
  
             process.destroy();
  
  
  
  
  
      }
  
  
  
  }

  I even tried process = pb.command(com).redirectErrorStream(true).start(); for execution. It gives me same error but this time environment was [ANDROID_SOCKET_Zygot] bla bla bla..

  EDIT 1 :
  I use Openjdk on ubuntu

  Help me out !!