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• How to get picture buffer data in ffmpeg ?

  5 juin 2014, par 4ntoine

  I’m trying to pass bitmap from ffmpeg to android.
  It already works but it’s displaying picture right on surface passed from java to native code.
  How can i get frame buffer bitmap data to pass it to java ?

  I’ve tried to save out_frame buffer data :

  unsigned char bmpFileHeader[14] = {'B', 'M', 0,0,0,0, 0,0, 0,0, 54, 0,0,0};
  
  unsigned char bmpInfoHeader[40] = {40,0,0,0, 0,0,0,0, 0,0,0,0, 1,0, 24,0};
  
  unsigned char bmpPad[3] = {0, 0, 0};
  
  
  
  void saveBuffer(int fileIndex, int width, int height, unsigned char *buffer, int buffer_size) {
  
  
  
      unsigned char filename[1024];
  
      sprintf(filename, "/storage/sdcard0/3d_player_%d.bmp", fileIndex);
  
  
  
      LOGI(10, "saving ffmpeg bitmap file: %d to %s", fileIndex, filename);
  
  
  
      FILE *bitmapFile = fopen(filename, "wb");
  
      if (!bitmapFile) {
  
          LOGE(10, "failed to create ffmpeg bitmap file");
  
          return;
  
      }
  
  
  
      unsigned char filesize = 54 + 3 * width * height; // 3 = (r,g,b)
  
  
  
      bmpFileHeader[2] = (unsigned char)(filesize);
  
      bmpFileHeader[3] = (unsigned char)(filesize >> 8);
  
      bmpFileHeader[4] = (unsigned char)(filesize >> 16);
  
      bmpFileHeader[5] = (unsigned char)(filesize >> 24);
  
  
  
      bmpInfoHeader[4] = (unsigned char)(width);
  
      bmpInfoHeader[5] = (unsigned char)(width >> 8);
  
      bmpInfoHeader[6] = (unsigned char)(width >> 16);
  
      bmpInfoHeader[7] = (unsigned char)(width >> 24);
  
      bmpInfoHeader[8] = (unsigned char)(height);
  
      bmpInfoHeader[9] = (unsigned char)(height >> 8);
  
      bmpInfoHeader[10] = (unsigned char)(height >> 16);
  
      bmpInfoHeader[11] = (unsigned char)(height >> 24);
  
  
  
      fwrite(bmpFileHeader, 1, 14, bitmapFile);
  
      fwrite(bmpInfoHeader, 1, 40, bitmapFile);
  
      int i;
  
      for (i=0; iplayer;
  
      int stream_no = decoder_data->stream_no;
  
      AVCodecContext * ctx = player->input_codec_ctxs[stream_no];
  
      AVFrame * frame = player->input_frames[stream_no];
  
      AVStream * stream = player->input_streams[stream_no];
  
      int interrupt_ret;
  
      int to_write;
  
      int err = 0;
  
      AVFrame *rgb_frame = player->rgb_frame;
  
      ANativeWindow_Buffer buffer;
  
      ANativeWindow * window;
  
  
  
  #ifdef MEASURE_TIME
  
      struct timespec timespec1, timespec2, diff;
  
  #endif // MEASURE_TIME
  
      LOGI(10, "player_decode_video decoding");
  
      int frameFinished;
  
  
  
  #ifdef MEASURE_TIME
  
      clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &timespec1);
  
  #endif // MEASURE_TIME
  
      int ret = avcodec_decode_video2(ctx, frame, &frameFinished,
  
              packet_data->packet);
  
  
  
  #ifdef MEASURE_TIME
  
      clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &timespec2);
  
      diff = timespec_diff(timespec1, timespec2);
  
      LOGI(3, "decode_video timediff: %d.%9ld", diff.tv_sec, diff.tv_nsec);
  
  #endif // MEASURE_TIME
  
  
  
      if (ret < 0) {
  
          LOGE(1, "player_decode_video Fail decoding video %d\n", ret);
  
          return -ERROR_WHILE_DECODING_VIDEO;
  
      }
  
      if (!frameFinished) {
  
          LOGI(10, "player_decode_video Video frame not finished\n");
  
          return 0;
  
      }
  
  
  
      // saving in buffer converted video frame
  
      LOGI(7, "player_decode_video copy wait");
  
  
  
  #ifdef MEASURE_TIME
  
      clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &timespec1);
  
  #endif // MEASURE_TIME
  
  
  
      pthread_mutex_lock(&player->mutex_queue);
  
      window = player->window;
  
      if (window == NULL) {
  
          pthread_mutex_unlock(&player->mutex_queue);
  
          goto skip_frame;
  
      }
  
      ANativeWindow_setBuffersGeometry(window, ctx->width, ctx->height,
  
              WINDOW_FORMAT_RGBA_8888);
  
      if (ANativeWindow_lock(window, &buffer, NULL) != 0) {
  
          pthread_mutex_unlock(&player->mutex_queue);
  
          goto skip_frame;
  
      }
  
      pthread_mutex_unlock(&player->mutex_queue);
  
  
  
      int format = buffer.format;
  
      if (format < 0) {
  
          LOGE(1, "Could not get window format")
  
      }
  
      enum PixelFormat out_format;
  
      if (format == WINDOW_FORMAT_RGBA_8888) {
  
          out_format = PIX_FMT_RGBA;
  
          LOGI(6, "Format: WINDOW_FORMAT_RGBA_8888");
  
      } else if (format == WINDOW_FORMAT_RGBX_8888) {
  
          out_format = PIX_FMT_RGB0;
  
          LOGE(1, "Format: WINDOW_FORMAT_RGBX_8888 (not supported)");
  
      } else if (format == WINDOW_FORMAT_RGB_565) {
  
          out_format = PIX_FMT_RGB565;
  
          LOGE(1, "Format: WINDOW_FORMAT_RGB_565 (not supported)");
  
      } else {
  
          LOGE(1, "Unknown window format");
  
      }
  
  
  
      avpicture_fill((AVPicture *) rgb_frame, buffer.bits, out_format,
  
              buffer.width, buffer.height);
  
      rgb_frame->data[0] = buffer.bits;
  
      if (format == WINDOW_FORMAT_RGBA_8888) {
  
          rgb_frame->linesize[0] = buffer.stride * 4;
  
      } else {
  
          LOGE(1, "Unknown window format");
  
      }
  
      LOGI(6,
  
              "Buffer: width: %d, height: %d, stride: %d",
  
              buffer.width, buffer.height, buffer.stride);
  
      int i = 0;
  
  
  
  #ifdef MEASURE_TIME
  
      clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &timespec2);
  
      diff = timespec_diff(timespec1, timespec2);
  
      LOGI(1,
  
              "lockPixels and fillimage timediff: %d.%9ld", diff.tv_sec, diff.tv_nsec);
  
  #endif // MEASURE_TIME
  
  #ifdef MEASURE_TIME
  
      clock_gettime(CLOCK_PROCESS_CPUTIME_ID, &timespec1);
  
  #endif // MEASURE_TIME
  
      LOGI(7, "player_decode_video copying...");
  
      AVFrame * out_frame;
  
      int rescale;
  
      if (ctx->width == buffer.width && ctx->height == buffer.height) {
  
          // This always should be true
  
          out_frame = rgb_frame;
  
          rescale = FALSE;
  
      } else {
  
          out_frame = player->tmp_frame2;
  
          rescale = TRUE;
  
      }
  
  
  
      if (ctx->pix_fmt == PIX_FMT_YUV420P) {
  
          __I420ToARGB(frame->data[0], frame->linesize[0], frame->data[2],
  
                  frame->linesize[2], frame->data[1], frame->linesize[1],
  
                  out_frame->data[0], out_frame->linesize[0], ctx->width,
  
                  ctx->height);
  
      } else if (ctx->pix_fmt == PIX_FMT_NV12) {
  
          __NV21ToARGB(frame->data[0], frame->linesize[0], frame->data[1],
  
                  frame->linesize[1], out_frame->data[0], out_frame->linesize[0],
  
                  ctx->width, ctx->height);
  
      } else {
  
          LOGI(3, "Using slow conversion: %d ", ctx->pix_fmt);
  
          struct SwsContext *sws_context = player->sws_context;
  
          sws_context = sws_getCachedContext(sws_context, ctx->width, ctx->height,
  
                  ctx->pix_fmt, ctx->width, ctx->height, out_format,
  
                  SWS_FAST_BILINEAR, NULL, NULL, NULL);
  
          player->sws_context = sws_context;
  
          if (sws_context == NULL) {
  
              LOGE(1, "could not initialize conversion context from: %d"
  
              ", to :%d\n", ctx->pix_fmt, out_format);
  
              // TODO some error
  
          }
  
          sws_scale(sws_context, (const uint8_t * const *) frame->data,
  
                  frame->linesize, 0, ctx->height, out_frame->data,
  
                  out_frame->linesize);
  
      }
  
  
  
      if (rescale) {
  
          // Never occurs
  
          __ARGBScale(out_frame->data[0], out_frame->linesize[0], ctx->width,
  
                  ctx->height, rgb_frame->data[0], rgb_frame->linesize[0],
  
                  buffer.width, buffer.height, __kFilterNone);
  
          out_frame = rgb_frame;
  
      }
  
  
  
      // TODO: (4ntoine) frame decoded and rescaled, ready to call callback with frame picture from buffer
  
      int bufferSize = buffer.width * buffer.height * 3; // 3 = (r,g,b);  
  
  
  
      static int bitmapCounter = 0;
  
      if (bitmapCounter < 10) {
  
          saveBuffer(bitmapCounter++, buffer.width, buffer.height, (unsigned char *)out_frame->data, bufferSize);
  
      }

  but out_frame is empty and file has header and 0x00 bytes body.

  How to get picture buffer data in ffmpeg ?

• How To Convert MP4 Video File into FLV Format Using FFMPEG

  23 septembre 2015, par nipul_tech

  i have to Convert MP4 Video File into FLV Format Using FFMPEG which i received from different mobile device. i found most of the stuff to convert flv video into mp4 and all.

  can any body help me out to convert mp4 format into flv using FFMPEG. i am using windows 7 64bit machine.

• Revision cb4693afda : Fixed file offset when checking for data tags overflows. Fixed flv file dump sto

  21 avril 2011, par Marc Noirot

  Changed Paths :
   Modify /src/check.c

  
   Modify /src/flv.c

  
  
  Fixed file offset when checking for data tags overflows.
  Fixed flv file dump stopping when encountering an empty tag body.