Matlab GUI not showing line plot graph data

Hi,

I'm working with my matlab gui file to play video and plot the mean value from the color channel (RGB). It has 2 axis, the first one for the video player and second axis for the mean graph, but the second axis is not showing any data, it just update the x and y coordinate but not showing anything.

Here is my code:

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*.
%
%      MAIN('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in MAIN.M with the given input arguments.
%
%      MAIN('Property','Value',...) creates a new MAIN or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before main_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to main_OpeningFcn via varargin.
%
%      *See GUI Options on GUIDE's Tools menu.  Choose "GUI allows only one
%      instance to run (singleton)".
%
% See also: GUIDE, GUIDATA, GUIHANDLES

% Edit the above text to modify the response to help main

% Last Modified by GUIDE v2.5 15-Apr-2019 14:23:35

% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @main_OpeningFcn, ...
                   'gui_OutputFcn',  @main_OutputFcn, ...
                   'gui_LayoutFcn',  [] , ...
                   'gui_Callback',   []);
if nargin && ischar(varargin{1})
    gui_State.gui_Callback = str2func(varargin{1});
end

if nargout
    [varargout{1:nargout}] = gui_mainfcn(gui_State, varargin{:});
else
    gui_mainfcn(gui_State, varargin{:});
end
% End initialization code - DO NOT EDIT


% --- Executes just before main is made visible.
function main_OpeningFcn(hObject, eventdata, handles, varargin)
% This function has no output args, see OutputFcn.
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
% varargin   command line arguments to main (see VARARGIN)


% Choose default command line output for main
handles.output = hObject;

% Create video object
% Putting the object into manual trigger mode and then
% starting the object will make GETSNAPSHOT return faster
% since the connection to the camera will already have
% been established.
% 
% dataDir = './data';
% vidFile = fullfile(dataDir,'yudha-result.avi');
% handles.videoFileReader = vision.VideoFileReader(vidFile);
% handles.frame   = step(handles.videoFileReader);
% handles.fig=image(handles.frame);

video = vision.VideoFileReader();
handles.video = video;
frameCount = 0;
handles.frameCount = frameCount;
% Update handles structure
guidata(hObject, handles);

% UIWAIT makes main wait for user response (see UIRESUME)
uiwait(handles.figure1);


% --- Outputs from this function are returned to the command line.
function varargout = main_OutputFcn(hObject, eventdata, handles) 
% varargout  cell array for returning output args (see VARARGOUT);
% hObject    handle to figure
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Get default command line output from handles structure
handles.output = hObject;
varargout{1} = handles.output;

% --- Executes on button press in Browse.
function Browse_Callback(hObject, eventdata, handles)
% hObject    handle to Browse (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
[ video_file_name,video_file_path ] = uigetfile({'*.avi'},'Pick a video file');      %;*.png;*.yuv;*.bmp;*.tif'},'Pick a file');
if(video_file_path == 0)
    return;
end
input_video_file = [video_file_path,video_file_name];
fullpath = strcat(video_file_path,video_file_name);
set(handles.edit1,'String',fullpath);
video = vision.VideoFileReader(input_video_file);
vidFrame = step(video);
axes(handles.axes1);set(handles.StartButton,'String','Start');
frameCount = 1;

imshow(vidFrame);
drawnow;
axis(handles.axes1,'off');

   for nChannel = 1:3
       colorChannel = vidFrame(:,:,nChannel);
       rawColorSignal(nChannel,frameCount) =  mean(mean(colorChannel));
   end
   
%plot(frameCount,rawColorSignal(1, :),frameCount,rawColorSignal(2, :),frameCount,rawColorSignal(3, :), handles.axes2);
axes(handles.axes2)
plot(frameCount,rawColorSignal(1, :));
grid on
drawnow;
axes(handles.axes1)
% Display Frame Number
%Update handles
handles.video = video;
guidata(hObject,handles);

function edit1_Callback(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hints: get(hObject,'String') returns contents of edit1 as text
%        str2double(get(hObject,'String')) returns contents of edit1 as a double

% --- Executes during object creation, after setting all properties.

function edit1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to edit1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: edit controls usually have a white background on Windows.
%       See ISPC and COMPUTER.
if ispc && isequal(get(hObject,'BackgroundColor'), get(0,'defaultUicontrolBackgroundColor'))
    set(hObject,'BackgroundColor','white');
end

% --- Executes on button press in StartButton.
function StartButton_Callback(hObject, eventdata, handles)
% hObject    handle to StartButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
if strcmp(get(handles.StartButton,'String'),'Pause')
    set(handles.StartButton,'String','Start');
else
    set(handles.StartButton,'String','Pause');
end
video = handles.video;

if  isDone(video)
    reset(video)
    frameCount = 0;
    handles.frameCount = frameCount;
end
frameCount = handles.frameCount;

 while ~isDone(video) && strcmp(get(handles.StartButton,'String'),'Pause')
     vidFrame   = step(video);
     imshow(vidFrame,'Parent',handles.axes1); %plot frame is specific axis
     drawnow;
    frameCount = frameCount + 1;
    for nChannel = 1:3
       colorChannel = vidFrame(:,:,nChannel);
       rawColorSignal(nChannel,frameCount) =  mean(mean(colorChannel));
    end
    
    plot(frameCount,rawColorSignal(1, :),'Parent',handles.axes2);
    grid on
    drawnow;
 end
    
%plot(frameCount,rawColorSignal(1, :),'r',frameCount,rawColorSignal(2, :),'g',frameCount,rawColorSignal(3, :),'b','Parent', handles.axes2);
%drawnow;
 set(handles.StartButton,'String','Start');

% --- Executes on button press in PauseButton.
function PauseButton_Callback(hObject, eventdata, handles)
% hObject    handle to PauseButton (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
%axes(handles.axes2)
%surf(membrane(3))

% --- Executes during object creation, after setting all properties.
function axes1_CreateFcn(hObject, eventdata, handles)
% hObject    handle to axes1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: place code in OpeningFcn to populate axes1


% --- Executes during object creation, after setting all properties.
function axes2_CreateFcn(hObject, eventdata, handles)
% hObject    handle to axes2 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    empty - handles not created until after all CreateFcns called

% Hint: place code in OpeningFcn to populate axes2


% --- Executes when user attempts to close figure1.
function figure1_CloseRequestFcn(hObject, eventdata, handles)
% hObject    handle to figure1 (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)

% Hint: delete(hObject) closes the figure
delete(hObject);