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• Encode image to video using ffmpeg

  4 juillet 2012, par bahar_p

  I'm trying to encode an image to video using ffmpeg library.
  I have these global params :

  //Global params
  
  AVCodec         *codec;
  
  AVCodecContext  *codecCtx;
  
  uint8_t         *output_buffer;
  
  int             output_buffer_size;

  I divided the encoding to 3 methods :
  Initialize the encoder :

  jint Java_com_camera_simpledoublewebcams2_CameraPreview_initencoder(JNIEnv* env,jobject thiz){
  
  avcodec_register_all();
  
  avcodec_init();
  
  av_register_all();
  
  
  
  int fps = 30;
  
  
  
  /* find the H263 video encoder */
  
  codec = avcodec_find_encoder(CODEC_ID_H263);
  
  if (!codec) {
  
      LOGI("avcodec_find_encoder() run fail.");
  
      return -5;
  
  }
  
  
  
  //allocate context
  
  codecCtx = avcodec_alloc_context();
  
  
  
  /* put sample parameters */
  
  codecCtx->bit_rate = 400000;
  
  /* resolution must be a multiple of two */
  
  codecCtx->width = 176;
  
  codecCtx->height = 144;
  
  /* frames per second */
  
  codecCtx->time_base = (AVRational){1,fps};
  
  codecCtx->pix_fmt = PIX_FMT_YUV420P;
  
  codecCtx->codec_id = CODEC_ID_H263;
  
  codecCtx->codec_type = AVMEDIA_TYPE_VIDEO;
  
  
  
  /* open it */
  
  if (avcodec_open(codecCtx, codec) < 0) {
  
      LOGI("avcodec_open() run fail.");
  
      return -10;
  
  }
  
  
  
  //init buffer
  
  output_buffer_size = 500000;
  
  output_buffer = malloc(output_buffer_size);
  
  
  
  return 0;

  }

  Encoding the image :

  jint Java_com_camera_simpledoublewebcams2_CameraPreview_encodejpeg(JNIEnv* env,jobject thiz,jchar* cImage, jint imageSize){
  
  int             out_size;
  
  AVFrame         *picture;
  
  AVFrame         *outpic;
  
  uint8_t         *outbuffer;
  
  
  
  //allocate frame    
  
  picture = avcodec_alloc_frame();    
  
  outpic = avcodec_alloc_frame();
  
  
  
  int nbytes = avpicture_get_size(PIX_FMT_YUV420P, codecCtx->width, codecCtx->height);
  
  outbuffer = (uint8_t*)av_malloc(nbytes);
  
  outpic->pts = 0;
  
  
  
  //fill picture with image
  
  avpicture_fill((AVPicture*)picture, (uint8_t*)cImage, PIX_FMT_RGBA, codecCtx->width, codecCtx->height);
  
  //fill outpic with empty image
  
  avpicture_fill((AVPicture*)outpic, outbuffer, PIX_FMT_YUV420P, codecCtx->width, codecCtx->height);
  
  
  
  //rescale the image 
  
  struct SwsContext* fooContext = sws_getContext(codecCtx->width, codecCtx->height, 
  
                                                         PIX_FMT_RGBA, 
  
                                                         codecCtx->width, codecCtx->height, 
  
                                                         PIX_FMT_YUV420P, 
  
                                                         SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
  sws_scale(fooContext, picture->data, picture->linesize, 0, codecCtx->height, outpic->data, outpic->linesize);   
  
  
  
  //encode the image
  
  out_size = avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, outpic);
  
  out_size += avcodec_encode_video(codecCtx, output_buffer, output_buffer_size, outpic);
  
  
  
  //release pictures
  
  av_free(outbuffer);
  
  av_free(picture);
  
  av_free(outpic);
  
  
  
  return out_size;

  }

  And closing the encoder :

  void Java_com_camera_simpledoublewebcams2_CameraPreview_closeencoder(JNIEnv* env,jobject thiz){
  
  free(output_buffer);
  
  avcodec_close(codecCtx);
  
  av_free(codecCtx);

  }

  When I send the first image, I get a result from the encoder. When I try to send another image the program crashes.
  I tried calling init once and then the images, then the close - didn't work.
  I tried calling the init and the close for every image - didn't work.

  Any suggestions ?

  Thanks !

• ffmpeg : several audio files + several images = 1 video ?

  18 octobre 2012, par user1752708

  I have about 500 audio clips and 500 images that I need to put together for a project I'm working on. Each video is made up of a number of audio clips and images. The order is already set by the naming (audio01.mp3 goes with image01.tiff etc). They files are divided into several folders named Chapter1, Chapter2 [...] Chapter12. The number of files in each folder differs, but the naming scheme is the same in each folder.

  Each image will need to have the same exact duration as its partner audio file.

  What is the best way of doing this ? I've found ways of putting together 1 image with 1 audio file (http://stackoverflow.com/questions/5887311/ffmpeg-1-image-1-audio-file-1-video) or several images with one audio file (http://superuser.com/questions/356974/how-to-turn-images-into-a-video-slideshow-with-sound/356982#356982) but nothing that does exactly what I want.

  I'd appreciate any help you could give me !

• IframeExtractor don't output sound with rtsp

  9 janvier 2013, par Kamax

  I use IframeExtractor from the git mooncatventure, it play nice the .mov file.
  But when i try to read a rtsp stream, i hear no sound.

  This is the FFMEG dump from the rtsp stream :

  Metadata:
  
  title           : unknown
  
  comment         : unknown
  
  Duration: N/A, start: 49435.000589, bitrate: 258 kb/s
  
  Program 3223 
  
  No Program
  
  Stream #0:0: Video: h264 (High) ([27][0][0][0] / 0x001B), yuv420p, 720x576 [SAR 64:45 DAR 16:9], 25 fps, 25 tbr, 90k tbn, 50 tbc
  
  Stream #0:1(fra): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 142 kb/s
  
  Stream #0:2(fra): Subtitle: dvb_teletext ([6][0][0][0] / 0x0006)
  
  Stream #0:3(qad): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, mono, fltp, 47 kb/s
  
  Stream #0:4(qaa): Audio: aac ([15][0][0][0] / 0x000F), 48000 Hz, stereo, fltp, 68 kb/s

  And this is the dump from the local .mov file that work :

  Metadata:
  
  major_brand     : qt  
  
  minor_version   : 0
  
  compatible_brands: qt  
  
  creation_time   : 2010-01-17 21:52:33
  
  model           : iPhone 3GS
  
  model-eng       : iPhone 3GS
  
  date            : 2010-01-17T16:52:33-0500
  
  date-eng        : 2010-01-17T16:52:33-0500
  
  encoder         : 3.1.2
  
  encoder-eng     : 3.1.2
  
  make            : Apple
  
  make-eng        : Apple
  
  Duration: 00:00:03.25, start: 0.000000, bitrate: 3836 kb/s
  
  Stream #0:0(und): Video: h264 (Baseline) (avc1 / 0x31637661), yuv420p, 640x480, 3695 kb/s, 30.02 fps, 30 tbr, 600 tbn, 1200 tbc
  
  Metadata:
  
    rotate          : 90
  
    creation_time   : 2010-01-17 21:52:33
  
    handler_name    : Core Media Data Handler
  
  Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, mono, fltp, 63 kb/s
  
  Metadata:
  
    creation_time   : 2010-01-17 21:52:33
  
    handler_name    : Core Media Data Handler

  The audio class that manage sounds contain a codec detector which say that the codec CODEC_ID_AAC is found for the two input :

  audioStreamBasicDesc_.mFormatFlags = 0;
  
  switch (_audioCodecContext->codec_id) {
  
      case CODEC_ID_MP3:
  
           audioStreamBasicDesc_.mFormatID = kAudioFormatMPEGLayer3;
  
          break;
  
      case CODEC_ID_AAC:
  
           audioStreamBasicDesc_.mFormatID = kAudioFormatMPEG4AAC;
  
           audioStreamBasicDesc_.mFormatFlags = kMPEG4Object_AAC_Main;
  
          NSLog(@"audio format aac %s (%d) is  supported",  _audioCodecContext->codec_name, _audioCodecContext->codec_id);
  
          break;
  
  }

  I see data going into the buffer but i hear nothing. It's maybe audioStreamBasicDesc_ which has wrong settings but i can't find what.

  Is it possible that it's not the same AAC codec ?

  Has someone experienced the same issue ?

  Any help are welcome, i'm on this problem since some days now.

  Edit :
  I have found a error that i had not before, i don't know how to resolve it. If i change audioStreamBasicDesc.mFramesPerPacket to 0 or divided by 2, the error message dissapear.

  AudioConverterNew returned 'fmt?'
  
  Prime failed ('fmt?'); will stop (72000/0 frames)