message: Solve issue
  Fix bug in camera_calibration.cpp that the program tries to
  parse input of type VIDEO_FILE as IMAGE_LIST which causes the
  program to crash.
diff: @@ -109,7 +109,7 @@ public:
  }
  else
  {
  - if (readStringList(input, imageList))
  + if (isListOfImages(input) && readStringList(input, imageList))
  {
  inputType = IMAGE_LIST;
  nrFrames = (nrFrames < (int)imageList.size()) ? nrFrames : (int)imageList.size();
  @@ -190,6 +190,16 @@ public:
  l.push_back((string)*it);
  return true;
  }
  +
  + static bool isListOfImages( const string& filename)
  + {
  + string s(filename);
  + // Look for file extension
  + if( s.find(".xml") == string::npos && s.find(".yaml") == string::npos && s.find(".yml") == string::npos )
  + return false;
  + else
  + return true;
  + }
  public:
  Size boardSize; // The size of the board -> Number of items by width and height
  Pattern calibrationPattern; // One of the Chessboard, circles, or asymmetric circle pattern
  