message: videoio(test): dump file size information
diff: @@ -164,6 +164,8 @@ public:
  }
  else
  {
  + printf("Case: '%s' (frame size %dx%d fps=%g). FileSize=%lld bytes\n",
  + s.c_str(), frame_s.width, frame_s.height, fps, (long long int)sz);
  if (sz < 8192)
  {
  fprintf(stderr, "ERROR: File name: %s is very small (data write problems?)\n", filename.c_str());
  