static void video_encode_example(uint8_t *video_buffer)
{
  AVCodec *codec;
  AVCodecContext *c= NULL;
  int i, out_size, size, x, y, outbuf_size;
  FILE *f;
  AVFrame *picture;
  uint8_t *outbuf, *picture_buf;

  fprintf(stdout, "Video encoding\n");

  /* register all the codecs */
  avcodec_register_all();
  avcodec_init();
  av_register_all();


  /* find the mpeg1 video encoder */
  codec = avcodec_find_encoder(CODEC_ID_MPEG2VIDEO);
  if (!codec) {
    fprintf(stderr, "codec not found\n");
    exit(1);
  }

  c = avcodec_alloc_context();
  picture = avcodec_alloc_frame();

  /* put sample parameters */
  c->bit_rate = 400000;
  /* resolution must be a multiple of two */
  c->width = 352;
  c->height = 288;
  /* frames per second */
  c->time_base= (AVRational){1,25};
  c->gop_size = 10; /* emit one intra frame every ten frames */
  c->max_b_frames=1;
  c->pix_fmt = PIX_FMT_YUV420P;

  /* open it */
  if (avcodec_open(c, codec) < 0) {
    fprintf(stderr, "could not open codec\n");
    exit(1);
  }

  /*
  f = fopen(filename, "wb");
  if (!f) {
    fprintf(stderr, "could not open %s\n", filename);
    exit(1);
  }
  */

  /* alloc image and output buffer */
  int out_index = 0;
  outbuf_size = 100000;
  outbuf = static_cast<uint8_t *>(malloc(outbuf_size));
  size = c->width * c->height;
  picture_buf = static_cast<uint8_t *>(malloc((size * 3) / 2)); /* size for YUV 420 */

  picture->data[0] = picture_buf;
  picture->data[1] = picture->data[0] + size;
  picture->data[2] = picture->data[1] + size / 4;
  picture->linesize[0] = c->width;
  picture->linesize[1] = c->width / 2;
  picture->linesize[2] = c->width / 2;

  /* encode 1 second of video */
  for(i=0;i<25;i++) {
    //fflush(stdout);
    /* prepare a dummy image */
    /* Y */
    for(y=0;y<c->height;y++) {
      for(x=0;x<c->width;x++) {
        picture->data[0][y * picture->linesize[0] + x] = x + y + i * 3;
      }
    }

    /* Cb and Cr */
    for(y=0;y<c->height/2;y++) {
      for(x=0;x<c->width/2;x++) {
        picture->data[1][y * picture->linesize[1] + x] = 128 + y + i * 2;
        picture->data[2][y * picture->linesize[2] + x] = 64 + x + i * 5;
      }
    }
    fprintf(stdout, "picture->data[0][0] = %d\n", picture->data[0][0]);

    /* encode the image */
    out_size = avcodec_encode_video(c, outbuf, outbuf_size, picture);
    fprintf(stdout, "encoding frame %3d (size=%5d)\n", i, out_size);
    // Copy the image to the video buffer.
    memcpy(outbuf, video_buffer + out_index, out_size);
    out_index += out_size;
    int ri = 1000;
    fprintf(stdout, "outbuf[%d] = %d\n", ri, outbuf[ri]);
    //fwrite(outbuf, 1, out_size, f);
  }

  /* get the delayed frames */
  for(; out_size; i++) {
    //fflush(stdout);

    out_size = avcodec_encode_video(c, outbuf, outbuf_size, NULL);
    fprintf(stdout, "write frame %3d (size=%5d)\n", i, out_size);
    memcpy(outbuf, video_buffer + out_index, out_size);
    out_index += out_size;
    //fwrite(outbuf, 1, out_size, f);
  }

  /* add sequence end code to have a real mpeg file */
  outbuf[0] = 0x00;
  outbuf[1] = 0x00;
  outbuf[2] = 0x01;
  outbuf[3] = 0xb7;
  memcpy(outbuf, video_buffer + out_index, 4);
  //fwrite(outbuf, 1, 4, f);
  //fclose(f);
  free(picture_buf);
  free(outbuf);

  avcodec_close(c);
  av_free(c);
  av_free(picture);
  fprintf(stdout, "\n");
}