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• Video encoding and keyframes

  24 février 2013, par Tishu

  I am transcoding a video frame by frame and using x264+ffmpeg to encode. The original video plays fine, but the first few frames of my transcoded vide show grey artefacts. I understand this is because of time compression and these artefacts disappear after a few frames.

  See these two pictures which are the first and second frames. The third frame is normal (i.e. no grey artefact and not blurry like the second one)
  
  

  How can I force the first frame to be a key frame (ie fully encoded in my output video) so that these artefacts do not show ?

  Edit - more details

  Here is what I am doing more in details. I used bit form differents tutorials to read a video frame by frame and reencode each frame to a new video. My encoding parameters are the following :

  avcodec_get_context_defaults3(c, *codec);
  
  c->codec_id = codec_id;
  
  c->bit_rate = output_bitrate;
  
  /* Resolution must be a multiple of two. */
  
  c->width    = output_width;
  
  c->height   = output_height;
  
  /* timebase: This is the fundamental unit of time (in seconds) in terms
  
   * of which frame timestamps are represented. For fixed-fps content,
  
   * timebase should be 1/framerate and timestamp increments should be
  
   * identical to 1. */
  
  st->r_frame_rate.num = output_framerate_num;
  
  st->r_frame_rate.den = output_framerate_den;
  
  c->time_base.den = output_timebase_den;
  
  c->time_base.num = output_timebase_num;
  
  c->gop_size      = 3; /* emit one intra frame every twelve frames at most */
  
  c->pix_fmt       = STREAM_PIX_FMT;
  
  if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
  
      /* just for testing, we also add B frames */
  
      c->max_b_frames = 2;
  
  }
  
  if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
  
      /* Needed to avoid using macroblocks in which some coeffs overflow.
  
       * This does not happen with normal video, it just happens here as
  
       * the motion of the chroma plane does not match the luma plane. */
  
      c->mb_decision = 2;
  
  }
  
  c->max_b_frames = 2;
  
  c->scenechange_threshold = 0;
  
  c->rc_buffer_size = 0;
  
  c->me_method = ME_ZERO;

  Then I process each frame, probably doing something wrong there. The decoding bit :

  while(av_read_frame(gFormatCtx, &packet)>=0) {
  
      // Is this a packet from the video stream?
  
      if(packet.stream_index==gVideoStreamIndex) {
  
          // Decode video frame
  
          avcodec_decode_video2(gVideoCodecCtx, pCurrentFrame, &frameFinished, &packet);
  
          // Did we get a video frame?
  
          if(frameFinished) {
  
              [...]
  
              if(firstPts == -999) /*Initial value*/
  
                  firstPts = packet.pts;
  
              deltaPts = packet.pts - firstPts;
  
              double seconds = deltaPts*av_q2d(gFormatCtx->streams[gVideoStreamIndex]->time_base);
  
              [...]
  
              muxing_writeVideoFrame(pCurrentFrame, packet.pts);
  
          }
  
      }
  
  }

  The actual writing :

  int muxing_writeVideoFrame(AVFrame *frame, int64_t pts)
  
  {
  
  frameCount = frameCount +1;
  
  if(frameCount > 0)
  
  {
  
      if (video_st)
  
          video_pts = (double)video_st->pts.val * video_st->time_base.num /
  
                      video_st->time_base.den;
  
      else
  
          video_pts = 0.0;
  
  
  
      if (video_st && !(video_st && audio_st && audio_pts < video_pts))
  
      {
  
          frame->pts = pts;//av_rescale_q(frame_count, video_st->codec->time_base, video_st->time_base);
  
          write_video_frame(oc, video_st, frame);
  
      }
  
  }
  
  
  
  return 0;
  
  }
  
  
  
  static int write_video_frame(AVFormatContext *oc, AVStream *st, AVFrame *frame)
  
  {
  
      int ret;
  
      static struct SwsContext *sws_ctx;
  
      //LOGI(10, frame_count);
  
      AVCodecContext *c = st->codec;
  
  
  
      /* encode the image */
  
      AVPacket pkt;
  
      int got_output;
  
      av_init_packet(&pkt);
  
      pkt.data = NULL;    // packet data will be allocated by the encoder
  
      pkt.size = 0;
  
  ret = avcodec_encode_video2(c, &pkt, frame, &got_output);
  
  if (ret < 0) {
  
      fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  
      exit(1);
  
  }
  
  /* If size is zero, it means the image was buffered. */
  
  if (got_output) {
  
      if (c->coded_frame->key_frame)
  
          pkt.flags |= AV_PKT_FLAG_KEY;
  
      pkt.stream_index = st->index;
  
      /* Write the compressed frame to the media file. */
  
      ret = av_interleaved_write_frame(oc, &pkt);
  
  } else {
  
      ret = 0;
  
  }
  
  
  
      if (ret != 0) {
  
          LOGI(10, av_err2str(ret));
  
          exit(1);
  
      }
  
      frame_count++;
  
      return got_output;
  
  }

• C - Transcoding to UDP using FFmpeg ?

  30 avril 2013, par golmschenk

  I'm trying to use the FFmpeg libraries to take an existing video file and stream it over a UDP connection. Specifically, I've been looking at the muxing.c and demuxing.c example files in the source code doc/example directory of FFmpeg. The demuxing file presents code which allows an input video to be converted into the video and audio streams. The muxing file presents code which creates fake data and can already be output to a UDP connection as I would like. I've begun work combining the two. Below can be found my code which is basically a copy of the muxing file with some parts replaced/appended with parts of the demuxing file. Unfortunately I'm running into plenty of complications attempting my goal through this approach. Is there an existing source code example which does the transcoding I'm looking for ? Or at least a tutorial on how one might create this ? If not, at least a few pointers might be helpful in directing my work in combing the two files to achieve my goal. Specifically, I'm getting the error :

  [NULL @ 0x23b4040] Unable to find a suitable output format for 'udp://localhost:7777'
  
  Could not deduce output format from file extension: using MPEG.
  
  Output #0, mpeg, to 'udp://localhost:7777':

  Even though the muxing file could accept UDP formats. Any suggestions ? Thank you much !

  #include 
  
  #include 
  
  #include 
  
  #include 
  
  
  
  #include <libavutil></libavutil>mathematics.h>
  
  #include <libavformat></libavformat>avformat.h>
  
  #include <libswscale></libswscale>swscale.h>
  
  
  
  /* 5 seconds stream duration */
  
  #define STREAM_DURATION   200.0
  
  #define STREAM_FRAME_RATE 25 /* 25 images/s */
  
  #define STREAM_NB_FRAMES  ((int)(STREAM_DURATION * STREAM_FRAME_RATE))
  
  #define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P /* default pix_fmt */
  
  
  
  //FROM DE
  
  static AVFormatContext *fmt_ctx = NULL;
  
  static AVCodecContext *video_dec_ctx = NULL, *audio_dec_ctx;
  
  static AVStream *video_stream = NULL, *audio_stream = NULL;
  
  static const char *src_filename = NULL;
  
  static const char *video_dst_filename = NULL;
  
  static const char *audio_dst_filename = NULL;
  
  static FILE *video_dst_file = NULL;
  
  static FILE *audio_dst_file = NULL;
  
  
  
  static uint8_t *video_dst_data[4] = {NULL};
  
  static int      video_dst_linesize[4];
  
  static int video_dst_bufsize;
  
  
  
  static uint8_t **audio_dst_data = NULL;
  
  static int       audio_dst_linesize;
  
  static int audio_dst_bufsize;
  
  
  
  static int video_stream_idx = -1, audio_stream_idx = -1;
  
  static AVFrame *frame = NULL;
  
  static AVPacket pkt;
  
  static int video_frame_count = 0;
  
  static int audio_frame_count = 0;
  
  //END DE
  
  
  
  static int sws_flags = SWS_BICUBIC;
  
  
  
  /**************************************************************/
  
  /* audio output */
  
  
  
  static float t, tincr, tincr2;
  
  static int16_t *samples;
  
  static int audio_input_frame_size;
  
  
  
  /* Add an output stream. */
  
  static AVStream *add_stream(AVFormatContext *oc, AVCodec **codec,
  
                              enum AVCodecID codec_id)
  
  {
  
      AVCodecContext *c;
  
      AVStream *st;
  
  
  
      /* find the encoder */
  
      *codec = avcodec_find_encoder(codec_id);
  
      if (!(*codec)) {
  
          fprintf(stderr, "Could not find encoder for &#39;%s&#39;\n",
  
                  avcodec_get_name(codec_id));
  
          exit(1);
  
      }
  
  
  
      st = avformat_new_stream(oc, *codec);
  
      if (!st) {
  
          fprintf(stderr, "Could not allocate stream\n");
  
          exit(1);
  
      }
  
      st->id = oc->nb_streams-1;
  
      c = st->codec;
  
  
  
      switch ((*codec)->type) {
  
      case AVMEDIA_TYPE_AUDIO:
  
          st->id = 1;
  
          c->sample_fmt  = AV_SAMPLE_FMT_S16;
  
          c->bit_rate    = 64000;
  
          c->sample_rate = 44100;
  
          c->channels    = 2;
  
          break;
  
  
  
      case AVMEDIA_TYPE_VIDEO:
  
          c->codec_id = codec_id;
  
  
  
          c->bit_rate = 400000;
  
          /* Resolution must be a multiple of two. */
  
          c->width    = 352;
  
          c->height   = 288;
  
          /* timebase: This is the fundamental unit of time (in seconds) in terms
  
           * of which frame timestamps are represented. For fixed-fps content,
  
           * timebase should be 1/framerate and timestamp increments should be
  
           * identical to 1. */
  
          c->time_base.den = STREAM_FRAME_RATE;
  
          c->time_base.num = 1;
  
          c->gop_size      = 12; /* emit one intra frame every twelve frames at most */
  
          c->pix_fmt       = STREAM_PIX_FMT;
  
          if (c->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
  
              /* just for testing, we also add B frames */
  
              c->max_b_frames = 2;
  
          }
  
          if (c->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
  
              /* Needed to avoid using macroblocks in which some coeffs overflow.
  
               * This does not happen with normal video, it just happens here as
  
               * the motion of the chroma plane does not match the luma plane. */
  
              c->mb_decision = 2;
  
          }
  
      break;
  
  
  
      default:
  
          break;
  
      }
  
  
  
      /* Some formats want stream headers to be separate. */
  
      if (oc->oformat->flags &amp; AVFMT_GLOBALHEADER)
  
          c->flags |= CODEC_FLAG_GLOBAL_HEADER;
  
  
  
      return st;
  
  }
  
  
  
  /**************************************************************/
  
  /* audio output */
  
  
  
  static float t, tincr, tincr2;
  
  static int16_t *samples;
  
  static int audio_input_frame_size;
  
  
  
  static void open_audio(AVFormatContext *oc, AVCodec *codec, AVStream *st)
  
  {
  
      AVCodecContext *c;
  
      int ret;
  
  
  
      c = st->codec;
  
  
  
      /* open it */
  
      ret = avcodec_open2(c, codec, NULL);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not open audio codec: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
  
  
      /* init signal generator */
  
      t     = 0;
  
      tincr = 2 * M_PI * 110.0 / c->sample_rate;
  
      /* increment frequency by 110 Hz per second */
  
      tincr2 = 2 * M_PI * 110.0 / c->sample_rate / c->sample_rate;
  
  
  
      if (c->codec->capabilities &amp; CODEC_CAP_VARIABLE_FRAME_SIZE)
  
          audio_input_frame_size = 10000;
  
      else
  
          audio_input_frame_size = c->frame_size;
  
      samples = av_malloc(audio_input_frame_size *
  
                          av_get_bytes_per_sample(c->sample_fmt) *
  
                          c->channels);
  
      if (!samples) {
  
          fprintf(stderr, "Could not allocate audio samples buffer\n");
  
          exit(1);
  
      }
  
  }
  
  
  
  /* Prepare a 16 bit dummy audio frame of &#39;frame_size&#39; samples and
  
   * &#39;nb_channels&#39; channels. */
  
  static void get_audio_frame(int16_t *samples, int frame_size, int nb_channels)
  
  {
  
      int j, i, v;
  
      int16_t *q;
  
  
  
      q = samples;
  
      for (j = 0; j &lt; frame_size; j++) {
  
          v = (int)(sin(t) * 10000);
  
          for (i = 0; i &lt; nb_channels; i++)
  
              *q++ = v;
  
          t     += tincr;
  
          tincr += tincr2;
  
      }
  
  }
  
  
  
  static void write_audio_frame(AVFormatContext *oc, AVStream *st)
  
  {
  
      AVCodecContext *c;
  
      AVPacket pkt = { 0 }; // data and size must be 0;
  
      AVFrame *frame = avcodec_alloc_frame();
  
      int got_packet, ret;
  
  
  
      av_init_packet(&amp;pkt);
  
      c = st->codec;
  
  
  
      get_audio_frame(samples, audio_input_frame_size, c->channels);
  
      frame->nb_samples = audio_input_frame_size;
  
      avcodec_fill_audio_frame(frame, c->channels, c->sample_fmt,
  
                               (uint8_t *)samples,
  
                               audio_input_frame_size *
  
                               av_get_bytes_per_sample(c->sample_fmt) *
  
                               c->channels, 1);
  
  
  
      ret = avcodec_encode_audio2(c, &amp;pkt, frame, &amp;got_packet);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Error encoding audio frame: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
  
  
      if (!got_packet)
  
          return;
  
  
  
      pkt.stream_index = st->index;
  
  
  
      /* Write the compressed frame to the media file. */
  
      ret = av_interleaved_write_frame(oc, &amp;pkt);
  
      if (ret != 0) {
  
          fprintf(stderr, "Error while writing audio frame: %s\n",
  
                  av_err2str(ret));
  
          exit(1);
  
      }
  
      avcodec_free_frame(&amp;frame);
  
  }
  
  
  
  static void close_audio(AVFormatContext *oc, AVStream *st)
  
  {
  
      avcodec_close(st->codec);
  
  
  
      av_free(samples);
  
  }
  
  
  
  /**************************************************************/
  
  /* video output */
  
  
  
  static AVFrame *frame;
  
  static AVPicture src_picture, dst_picture;
  
  static int frame_count;
  
  
  
  static void open_video(AVFormatContext *oc, AVCodec *codec, AVStream *st)
  
  {
  
      int ret;
  
      AVCodecContext *c = st->codec;
  
  
  
      /* open the codec */
  
      ret = avcodec_open2(c, codec, NULL);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not open video codec: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
  
  
      /* allocate and init a re-usable frame */
  
      frame = avcodec_alloc_frame();
  
      if (!frame) {
  
          fprintf(stderr, "Could not allocate video frame\n");
  
          exit(1);
  
      }
  
  
  
      /* Allocate the encoded raw picture. */
  
      ret = avpicture_alloc(&amp;dst_picture, c->pix_fmt, c->width, c->height);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not allocate picture: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
  
  
      /* If the output format is not YUV420P, then a temporary YUV420P
  
       * picture is needed too. It is then converted to the required
  
       * output format. */
  
      if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
  
          ret = avpicture_alloc(&amp;src_picture, AV_PIX_FMT_YUV420P, c->width, c->height);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Could not allocate temporary picture: %s\n",
  
                      av_err2str(ret));
  
              exit(1);
  
          }
  
      }
  
  
  
      /* copy data and linesize picture pointers to frame */
  
      *((AVPicture *)frame) = dst_picture;
  
  }
  
  
  
  /* Prepare a dummy image. */
  
  static void fill_yuv_image(AVPicture *pict, int frame_index,
  
                             int width, int height)
  
  {
  
      int x, y, i;
  
  
  
      i = frame_index;
  
  
  
      /* Y */
  
      for (y = 0; y &lt; height; y++)
  
          for (x = 0; x &lt; width; x++)
  
              pict->data[0][y * pict->linesize[0] + x] = x + y + i * 3;
  
  
  
      /* Cb and Cr */
  
      for (y = 0; y &lt; height / 2; y++) {
  
          for (x = 0; x &lt; width / 2; x++) {
  
              pict->data[1][y * pict->linesize[1] + x] = 128 + y + i * 2;
  
              pict->data[2][y * pict->linesize[2] + x] = 64 + x + i * 5;
  
          }
  
      }
  
  }
  
  
  
  static void write_video_frame(AVFormatContext *oc, AVStream *st)
  
  {
  
      int ret;
  
      static struct SwsContext *sws_ctx;
  
      AVCodecContext *c = st->codec;
  
  
  
      if (frame_count >= STREAM_NB_FRAMES) {
  
          /* No more frames to compress. The codec has a latency of a few
  
           * frames if using B-frames, so we get the last frames by
  
           * passing the same picture again. */
  
      } else {
  
          if (c->pix_fmt != AV_PIX_FMT_YUV420P) {
  
              /* as we only generate a YUV420P picture, we must convert it
  
               * to the codec pixel format if needed */
  
              if (!sws_ctx) {
  
                  sws_ctx = sws_getContext(c->width, c->height, AV_PIX_FMT_YUV420P,
  
                                           c->width, c->height, c->pix_fmt,
  
                                           sws_flags, NULL, NULL, NULL);
  
                  if (!sws_ctx) {
  
                      fprintf(stderr,
  
                              "Could not initialize the conversion context\n");
  
                      exit(1);
  
                  }
  
              }
  
              fill_yuv_image(&amp;src_picture, frame_count, c->width, c->height);
  
              sws_scale(sws_ctx,
  
                        (const uint8_t * const *)src_picture.data, src_picture.linesize,
  
                        0, c->height, dst_picture.data, dst_picture.linesize);
  
          } else {
  
              fill_yuv_image(&amp;dst_picture, frame_count, c->width, c->height);
  
          }
  
      }
  
  
  
      if (oc->oformat->flags &amp; AVFMT_RAWPICTURE) {
  
          /* Raw video case - directly store the picture in the packet */
  
          AVPacket pkt;
  
          av_init_packet(&amp;pkt);
  
  
  
          pkt.flags        |= AV_PKT_FLAG_KEY;
  
          pkt.stream_index  = st->index;
  
          pkt.data          = dst_picture.data[0];
  
          pkt.size          = sizeof(AVPicture);
  
  
  
          ret = av_interleaved_write_frame(oc, &amp;pkt);
  
      } else {
  
          AVPacket pkt = { 0 };
  
          int got_packet;
  
          av_init_packet(&amp;pkt);
  
  
  
          /* encode the image */
  
          ret = avcodec_encode_video2(c, &amp;pkt, frame, &amp;got_packet);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Error encoding video frame: %s\n", av_err2str(ret));
  
              exit(1);
  
          }
  
          /* If size is zero, it means the image was buffered. */
  
  
  
          if (!ret &amp;&amp; got_packet &amp;&amp; pkt.size) {
  
              pkt.stream_index = st->index;
  
  
  
              /* Write the compressed frame to the media file. */
  
              ret = av_interleaved_write_frame(oc, &amp;pkt);
  
          } else {
  
              ret = 0;
  
          }
  
      }
  
      if (ret != 0) {
  
          fprintf(stderr, "Error while writing video frame: %s\n", av_err2str(ret));
  
          exit(1);
  
      }
  
      frame_count++;
  
  }
  
  
  
  static void close_video(AVFormatContext *oc, AVStream *st)
  
  {
  
      avcodec_close(st->codec);
  
      av_free(src_picture.data[0]);
  
      av_free(dst_picture.data[0]);
  
      av_free(frame);
  
  }
  
  
  
  static int open_codec_context(int *stream_idx,
  
                                AVFormatContext *fmt_ctx, enum AVMediaType type)
  
  {
  
      int ret;
  
      AVStream *st;
  
      AVCodecContext *dec_ctx = NULL;
  
      AVCodec *dec = NULL;
  
  
  
      ret = av_find_best_stream(fmt_ctx, type, -1, -1, NULL, 0);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Could not find %s stream in input file &#39;%s&#39;\n",
  
                  av_get_media_type_string(type), src_filename);
  
          return ret;
  
      } else {
  
          *stream_idx = ret;
  
          st = fmt_ctx->streams[*stream_idx];
  
  
  
          /* find decoder for the stream */
  
          dec_ctx = st->codec;
  
          dec = avcodec_find_decoder(dec_ctx->codec_id);
  
          if (!dec) {
  
              fprintf(stderr, "Failed to find %s codec\n",
  
                      av_get_media_type_string(type));
  
              return ret;
  
          }
  
  
  
          if ((ret = avcodec_open2(dec_ctx, dec, NULL)) &lt; 0) {
  
              fprintf(stderr, "Failed to open %s codec\n",
  
                      av_get_media_type_string(type));
  
              return ret;
  
          }
  
      }
  
  
  
      return 0;
  
  }
  
  
  
  /**************************************************************/
  
  /* media file output */
  
  
  
  int main(int argc, char **argv)
  
  {
  
      const char *filename;
  
      AVOutputFormat *fmt;
  
      AVFormatContext *oc;
  
      AVStream *audio_st, *video_st;
  
      AVCodec *audio_codec, *video_codec;
  
      double audio_pts, video_pts;
  
      int ret = 0, got_frame;;
  
  
  
      /* Initialize libavcodec, and register all codecs and formats. */
  
      av_register_all();
  
  
  
      if (argc != 3) {
  
          printf("usage: %s input_file output_file\n"
  
                 "\n", argv[0]);
  
          return 1;
  
      }
  
  
  
      src_filename = argv[1];
  
      filename = argv[2];
  
  
  
      /* allocate the output media context */
  
      avformat_alloc_output_context2(&amp;oc, NULL, NULL, filename);
  
      if (!oc) {
  
          printf("Could not deduce output format from file extension: using MPEG.\n");
  
          avformat_alloc_output_context2(&amp;oc, NULL, "mpeg", filename);
  
      }
  
      if (!oc) {
  
          return 1;
  
      }
  
      fmt = oc->oformat;
  
  
  
      /* Add the audio and video streams using the default format codecs
  
       * and initialize the codecs. */
  
      video_stream = NULL;
  
      audio_stream = NULL;
  
  
  
      //FROM DE
  
      /* open input file, and allocate format context */
  
      if (avformat_open_input(&amp;fmt_ctx, src_filename, NULL, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not open source file %s\n", src_filename);
  
          exit(1);
  
      }
  
  
  
      /* retrieve stream information */
  
      if (avformat_find_stream_info(fmt_ctx, NULL) &lt; 0) {
  
          fprintf(stderr, "Could not find stream information\n");
  
          exit(1);
  
      }
  
      if (open_codec_context(&amp;video_stream_idx, fmt_ctx, AVMEDIA_TYPE_VIDEO) >= 0) {
  
          video_stream = fmt_ctx->streams[video_stream_idx];
  
          video_dec_ctx = video_stream->codec;
  
  
  
          /* allocate image where the decoded image will be put */
  
          ret = av_image_alloc(video_dst_data, video_dst_linesize,
  
                               video_dec_ctx->width, video_dec_ctx->height,
  
                               video_dec_ctx->pix_fmt, 1);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Could not allocate raw video buffer\n");
  
              goto end;
  
          }
  
          video_dst_bufsize = ret;
  
      }
  
  
  
      if (open_codec_context(&amp;audio_stream_idx, fmt_ctx, AVMEDIA_TYPE_AUDIO) >= 0) {
  
          int nb_planes;
  
  
  
          audio_stream = fmt_ctx->streams[audio_stream_idx];
  
          audio_dec_ctx = audio_stream->codec;
  
  
  
          nb_planes = av_sample_fmt_is_planar(audio_dec_ctx->sample_fmt) ?
  
              audio_dec_ctx->channels : 1;
  
          audio_dst_data = av_mallocz(sizeof(uint8_t *) * nb_planes);
  
          if (!audio_dst_data) {
  
              fprintf(stderr, "Could not allocate audio data buffers\n");
  
              ret = AVERROR(ENOMEM);
  
              goto end;
  
          }
  
      }
  
      //END DE
  
  
  
      /* Now that all the parameters are set, we can open the audio and
  
       * video codecs and allocate the necessary encode buffers. */
  
      if (video_stream)
  
          open_video(oc, video_codec, video_stream);
  
      if (audio_stream)
  
          open_audio(oc, audio_codec, audio_stream);
  
  
  
      av_dump_format(oc, 0, filename, 1);
  
  
  
      /* open the output file, if needed */
  
      if (!(fmt->flags &amp; AVFMT_NOFILE)) {
  
          ret = avio_open(&amp;oc->pb, filename, AVIO_FLAG_WRITE);
  
          if (ret &lt; 0) {
  
              fprintf(stderr, "Could not open &#39;%s&#39;: %s\n", filename,
  
                      av_err2str(ret));
  
              return 1;
  
          }
  
      }
  
  
  
      /* Write the stream header, if any. */
  
      ret = avformat_write_header(oc, NULL);
  
      if (ret &lt; 0) {
  
          fprintf(stderr, "Error occurred when opening output file: %s\n",
  
                  av_err2str(ret));
  
          return 1;
  
      }
  
  
  
      if (frame)
  
          frame->pts = 0;
  
      for (;;) {
  
          /* Compute current audio and video time. */
  
          if (audio_stream)
  
              audio_pts = (double)audio_stream->pts.val * audio_stream->time_base.num / audio_stream->time_base.den;
  
          else
  
              audio_pts = 0.0;
  
  
  
          if (video_stream)
  
              video_pts = (double)video_stream->pts.val * video_stream->time_base.num /
  
                          video_stream->time_base.den;
  
          else
  
              video_pts = 0.0;
  
  
  
          if ((!audio_stream || audio_pts >= STREAM_DURATION) &amp;&amp;
  
              (!video_stream || video_pts >= STREAM_DURATION))
  
              break;
  
  
  
          /* write interleaved audio and video frames */
  
          if (!video_stream || (video_stream &amp;&amp; audio_st &amp;&amp; audio_pts &lt; video_pts)) {
  
              write_audio_frame(oc, audio_stream);
  
          } else {
  
              write_video_frame(oc, video_stream);
  
              frame->pts += av_rescale_q(1, video_stream->codec->time_base, video_stream->time_base);
  
          }
  
      }
  
  
  
      /* Write the trailer, if any. The trailer must be written before you
  
       * close the CodecContexts open when you wrote the header; otherwise
  
       * av_write_trailer() may try to use memory that was freed on
  
       * av_codec_close(). */
  
      av_write_trailer(oc);
  
  
  
      /* Close each codec. */
  
      if (video_st)
  
          close_video(oc, video_st);
  
      if (audio_st)
  
          close_audio(oc, audio_st);
  
  
  
      if (!(fmt->flags &amp; AVFMT_NOFILE))
  
          /* Close the output file. */
  
          avio_close(oc->pb);
  
  
  
      /* free the stream */
  
      avformat_free_context(oc);
  
  
  
  end:
  
      if (video_dec_ctx)
  
          avcodec_close(video_dec_ctx);
  
      if (audio_dec_ctx)
  
          avcodec_close(audio_dec_ctx);
  
      avformat_close_input(&amp;fmt_ctx);
  
      if (video_dst_file)
  
          fclose(video_dst_file);
  
      if (audio_dst_file)
  
          fclose(audio_dst_file);
  
      av_free(frame);
  
      av_free(video_dst_data[0]);
  
      av_free(audio_dst_data);
  
  
  
      return 0;
  
  }

• Revision 22694ca1ad : Change txfm_type decision The changing in intra coding to base on transform blo

  22 mai 2013, par Yaowu Xu

  Changed Paths :
   Modify /vp9/common/vp9_blockd.h

  
  
  Change txfm_type decision

  The changing in intra coding to base on transform block, i.e. pred->
  txfm->quant->dequant-itxfm->recon, made all blocks within a prediction
  unit behave consistently, there is no longer a need to handle blocks
  differently based on the position within a predicitn block. So this
  commit simplifies the decision of transform type to be based on
  prediction mode only.

  Change-Id : If96cb72386f2e9186126ace88afa35ef085b6c96