You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: main.m
    path of file: ./repos/lrslibrary/gui
    
    the code of the file until where you have to start completion: function varargout = main(varargin)
% MAIN MATLAB code for main.fig
%      MAIN, by itself, creates a new MAIN or raises the existing
%      singleton*.
%
%      H = MAIN returns the handle to a new MAIN or the handle to
%      the existing singleton*.
%
%     
    
function pushbutton_select_input_Callback(hObject, eventdata, handles)
% hObject    handle to pushbutton_select_input (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
lrs_load_conf;
[filename, pathname] = uigetfile({'*.avi';'*.mpg';'*.mp4';'*.*'},'File Selector',fullfile(lrs_conf.lrs_dir,'dataset'));
if(~isequal(filename,0) && ~isequal(pathname,0))
  inputVideoHandle = handles.edit_input_video;
  fullpath = fullfile(pathname, filename);
  set(inputVideoHandle,'String',fullpath);
end