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• 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;
  
  
  
  }

• Remuxing DIVX to MP4 for iDevices

  16 octobre 2013, par Chris Robinson

  Please note, everything I refer to hereafter is using ffmpeg.

  I have a DIVX video which has an mpeg4 codec (MPEG4 Part 2) and an mp3 audio stream as given by ffmpeg -i file.avi. It's my understanding that I should simply be able to remux into an mp4 container for use with iTunes and iDevices by

  ffmpeg -i file.avi -vcodec copy -acodec copy output.mp4

  seeing as both codecs are complient with the Mpeg4 Part 14 specification. However I can't import these files into iTunes. I'm assuming this is because the FourCC of the original stream has been set to DIVX.

  Is there an easy way to change this without re-encoding the video stream ? I'm looking to remux rather than re-encode to keep losses to a minimum and because I have a massive library of DIVX files that I want to import into iTunes and ffmpeg is easily scriptable for addition of future files.

• ffmpeg capture audio in raw format

  25 mars 2014, par AmirH

  I would like to capture audio with ffmpeg in .raw format.
  Here is what I do to capture in .mp3 format :

  ffmpeg -f dshow -t 10 -i audio="virtual-audio-capturer" -y "sound.mp3"

  note that I don't want to capture in .mp3 then convert in .raw