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• Anomalie #2668 : MediaBox

  6 mai 2012, par marcimat -

  Ah oui, si j’en crois http://www.jacklmoore.com/colorbox il faut que la description ’current’ (transmis par ’boxstr_current’ en question) contienne les chaines current et total qui seront remplacé par colorbox par leurs valeurs. Du coup, les traduire n’a pas de sens et crée un (...)

• Decoding RIMM streaming file format

  10 septembre 2011, par Thomas

  I want to decode the video (visual) frames within a Blackberry RIMM file. So far I have a parser, and some corresponding container documentation from RIM. 

  The video codec is H264 and is explicitly set on the device using one of the video.encodings properties. However, FFMPEG is not able to decode the frames and this is driving me nuts.

  Edit 1 : The issues seems to be lack of SPS and PPS in the frames, and artificially inserting them have proven unsuccessful so far (all grey image). Blackberry 9700 sends

  0x00 0x00 0x ?? 0x ?? 0xType

  where Type is according to table 7-1 in the H264 spec (I and P frames). We believe the 0x ?? 0x ?? represent the size of the frame, however the size does not always correspond to the size found by the parser (the parser seems to be working correctly).

  I have a windows decoder codec from blackberry, called mc_demux_mp2_ds.ax, and can play some MPEG-4 files captured the same way, but it is a binary for windows. And the H264 files will not play either way. I am aware of previous attempts. The capture url for javax.microedition.media.Manager is

  encoding=video-3gpp_width=176_height=144_video_codec=H264_audio_codec=AAC

  and I am writing to an output stream. Some example files here.

  Edit 2 :Turns out that about 3-4 of the 12-15 available video capture modes are flat out failing and refusing to output data, even in the simplest of test applications. So any working solution should implement MPEG-4, H264 and H263 in both AMR and AAC, in so getting fallback alternatives when one sound codec and/or resolution fails. Reboots, hangs and what not litters the Blackberry video implementation and vary from firmware to firmware ; total suckage.

• FFmpeg : undefined references to av_frame_alloc()

  6 août 2014, par dontrythisathome

  I want to get into FFmpeg developing and i started following these samples tutorial here : here

  I started with the first tutorial - tutorial01.c - but i run into this problem ’undefined references to av_frame_alloc()’.

  I’m on Ubuntu 12.04 LTS.

  This is my program :

  /* 
  
   * File:   main.c
  
   * Author: dontrythisathome
  
   *
  
   * Created on 3 giugno 2014, 23.02
  
   */
  
  
  
  #include 
  
  #include <libavcodec></libavcodec>avcodec.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libavutil></libavutil>frame.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  /*
  
   *
  
   */
  
  void SaveFrame(AVFrame *pFrame, int width, int height, int iFrame)
  
      {
  
          FILE   *pFile;
  
          char  szFilename[32];
  
          int       y;
  
  
  
          //Apre il file
  
          sprintf(szFilename, "frame%d.ppm", iFrame);
  
          pFile=fopen(szFilename, "wb");
  
          if(pFile==NULL)
  
          {return; }
  
  
  
          //Scrive l'intestazione del file ( Larghezza x Altezza su video)
  
          fprintf(pFile, "P6\n%d %d\n255\n", width, height);
  
  
  
          //Scrive i data pixel
  
          for(y=0; ydata[0]+y*pFrame->linesize[0], 1, width*3, pFile);
  
          }
  
  
  
          //Chiude il file
  
          fclose(pFile);
  
        }
  
  /*
  
   * 
  
   */
  
  /*Main Function*/
  
  int main(int argc, char *argv[])
  
  {
  
      AVFormatContext *pFormatCtx;
  
      int                                     i, videoStreamIdx;
  
      AVCodecContext   *pCodecCtx;
  
      AVCodec                      *pCodec;
  
      AVFrame                      *pFrame;
  
      AVFrame                      *pFrameRGB;
  
      AVPacket                     packet;
  
      int                                     frameFinished;
  
      int                                     numBytes;
  
      uint8_t                           *buffer;
  
      static struct SwsContext  *img_convert_ctx;
  
  
  
      if(argc &lt; 2){
  
          printf("Inserisci un file video\n");
  
          return -1;
  
      }
  
  
  
      //Registra tutti i formati e i codec
  
      av_register_all();
  
  
  
      //Apre il file video
  
      if(avformat_open_input(&amp;pFormatCtx, argv[1], NULL, NULL) != 0)
  
      {return -1;} //Impossibile aprire il file
  
  
  
      //Recupera le informazioni dello stream
  
      if(avformat_find_stream_info(pFormatCtx, NULL) &lt; 0)
  
      {return -1;} // Couldn't find stream information
  
  
  
      //Versa le informazioni del file sullo standard error
  
      av_dump_format(pFormatCtx, 0, argv[1], 0);
  
  
  
      //Trova il primo stream video
  
      videoStreamIdx=-1;
  
      for(i=0; inb_streams; i++)
  
      {
  
          if(pFormatCtx->streams[i]->codec->codec_type == AVMEDIA_TYPE_VIDEO)
  
          { videoStreamIdx=i;
  
              break;}
  
      }
  
  
  
      if(videoStreamIdx==-1)
  
          return -1; // Impossibile trovare lo stream video
  
  
  
      // Punta al contenuto del codec per lo stream video
  
      pCodecCtx = pFormatCtx->streams[videoStreamIdx]->codec;
  
  
  
      // Trova il decoder per lo stream video
  
      pCodec = avcodec_find_decoder(pCodecCtx->codec_id);
  
      if(pCodec==NULL)
  
      {
  
          fprintf(stderr, "Codec Non Supportato!\n");
  
          return -1; //Impossibile trovare il codec
  
      }
  
  
  
      //Apre il codec
  
      if(avcodec_open2(pCodecCtx, pCodec, NULL) &lt; 0)
  
      {return -1;} //Impossibile aprire il codec
  
  
  
      //Alloca il frame video
  
      pFrame = av_frame_alloc();
  
  
  
      //Alloca una struct AVFrame
  
      pFrameRGB = av_frame_alloc();
  
      if(pFrameRGB==NULL)
  
      {return -1;}
  
  
  
      //Determina la grandezza necessaria per il buffer e lo alloca
  
      numBytes = avpicture_get_size(PIX_FMT_RGB24,
  
                                                                              pCodecCtx->width,
  
                                                                              pCodecCtx->height);
  
  
  
      buffer = (uint8_t *) av_malloc(numBytes*sizeof(uint8_t));
  
  
  
      //Assegna le parti appropriate del buffer sulla superficie dell'immagine in pFrameRGB
  
      //Tenere presente che pFrameRGB è un AVFrame, ma AVFrame è una superset di AVPicture
  
      avpicture_fill((AVPicture *)pFrameRGB, buffer, PIX_FMT_RGB24, pCodecCtx->width, pCodecCtx->height);
  
  
  
      int w = pCodecCtx->width;
  
      int h = pCodecCtx->height;
  
      img_convert_ctx = sws_getContext(w, h, pCodecCtx->pix_fmt,
  
                                                                                         w, h, PIX_FMT_RGB24,
  
                                                                                          SWS_LANCZOS, NULL, NULL, NULL);
  
  
  
      //Legge i frame e salva i primi 5 frame su disco
  
     i=0;
  
     while((av_read_frame(pFormatCtx, &amp;packet)>=0) &amp;&amp; (i&lt;5))
  
     {
  
         //Questo è il packet dello stream video?
  
         if(packet.stream_index==videoStreamIdx)
  
         {
  
             //Decodifica il frame video
  
             avcodec_decode_video2(pCodecCtx, pFrame, &amp;frameFinished, &amp;packet);
  
  
  
             //Si è riusiciti ad ottenere il frame video?
  
             if(frameFinished)
  
             {
  
                 i++;
  
                 sws_scale(img_convert_ctx, (const uint8_t * const *)pFrame->data,
  
                                          pFrame->linesize, 0, pCodecCtx->height,
  
                                          pFrameRGB->data, pFrameRGB->linesize);
  
                 SaveFrame(pFrameRGB, pCodecCtx->width, pCodecCtx->height, i);
  
             }
  
         }
  
  
  
         //Libera il pacchetto che era allocato da av_read_frame
  
         av_free_packet(&amp;packet);
  
     }
  
  
  
     //Libera l'immagine RGB
  
     av_free(buffer);
  
     av_free(pFrameRGB);
  
  
  
     //Libera il frame YUV
  
     av_free(pFrame);
  
  
  
     //Chiude il codec
  
     avcodec_close(pCodecCtx);
  
  
  
     //Chiude il file video
  
     avformat_close_input(&amp;pFormatCtx);
  
  
  
     /*FINE PROGRAMMA*/ 
  
  
  
      return 0;
  
  }

  This is the build output :

  "/usr/bin/make" -f nbproject/Makefile-Debug.mk QMAKE= SUBPROJECTS= .build-conf
  
  make[1]: ingresso nella directory "/home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid"
  
  "/usr/bin/make"  -f nbproject/Makefile-Debug.mk dist/Debug/GNU-Linux-x86/simplemediaplayerforandroid
  
  make[2]: ingresso nella directory "/home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid"
  
  mkdir -p dist/Debug/GNU-Linux-x86
  
  gcc     -o dist/Debug/GNU-Linux-x86/simplemediaplayerforandroid build/Debug/GNU-Linux-x86/main.o -L/usr/lib/x86_64-linux-gnu -lavformat -lavcodec -lavutil -lswscale -lz -lbz2
  
  build/Debug/GNU-Linux-x86/main.o: In function `main':
  
  /home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid/main.c:105: undefined reference to `av_frame_alloc'
  
  /home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid/main.c:108: undefined reference to `av_frame_alloc'
  
  collect2: ld returned 1 exit status
  
  make[2]: *** [dist/Debug/GNU-Linux-x86/simplemediaplayerforandroid] Errore 1
  
  make[2]: uscita dalla directory "/home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid"
  
  make[1]: *** [.build-conf] Errore 2
  
  make[1]: uscita dalla directory "/home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid"
  
  make: *** [.build-impl] Errore 2
  
  
  
  BUILD FAILED (exit value 2, total time: 143ms)

  I also linked the correct library path and headers path because there is no error with that.

  But when i try to build the program from the terminal with these commands :

  gcc -o prog1 /home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid/main.c -lavformat -lavcodec -lavutil -lswscale -lz -lbz2

  And the output is different :

  /home/dontrythisathome/Programmazione/C-C++/SimpleMediaPlayerForAndroid/main.c:11:29: fatal error: libavutil/frame.h: File o directory non esistente
  
  compilation terminated.

  The output says that there is no file or directory existing.
  What is the problem ?