MATLAB: Hi there, i am having some dificulties with the GUI, i made a GUI to record video from the webcam and evrything is going well but there is a problem when i play the video, the video goes too fast. how can i get i normal video

digital image processingimage acquisitionimage processing

function varargout = untitled2(varargin)
% UNTITLED2 MATLAB code for untitled2.fig
%      UNTITLED2, by itself, creates a new UNTITLED2 or raises the existing
%      singleton*.
%




%      H = UNTITLED2 returns the handle to a new UNTITLED2 or the handle to
%      the existing singleton*.
%
%      UNTITLED2('CALLBACK',hObject,eventData,handles,...) calls the local
%      function named CALLBACK in UNTITLED2.M with the given input arguments.
%
%      UNTITLED2('Property','Value',...) creates a new UNTITLED2 or raises the
%      existing singleton*.  Starting from the left, property value pairs are
%      applied to the GUI before untitled2_OpeningFcn gets called.  An
%      unrecognized property name or invalid value makes property application
%      stop.  All inputs are passed to untitled2_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 untitled2
% Last Modified by GUIDE v2.5 02-Jun-2017 18:42:41
% Begin initialization code - DO NOT EDIT
gui_Singleton = 1;
gui_State = struct('gui_Name',       mfilename, ...
                   'gui_Singleton',  gui_Singleton, ...
                   'gui_OpeningFcn', @untitled2_OpeningFcn, ...
                   'gui_OutputFcn',  @untitled2_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 untitled2 is made visible.
function untitled2_OpeningFcn(hObject, ~, 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 untitled2 (see VARARGIN)
% Choose default command line output for untitled2
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
% UIWAIT makes untitled2 wait for user response (see UIRESUME)
% uiwait(handles.figure1);
% --- Outputs from this function are returned to the command line.
function varargout = untitled2_OutputFcn(~, ~, 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
varargout{1} = handles.output;
% --- Executes on button press in configuracion.
function configuracion_Callback(~, ~, handles)
% hObject    handle to configuracion (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global IA DeviceID Format
IAHI=imaqhwinfo;
IA=(IAHI.InstalledAdaptors);
D=menu('Seleccione dispositivos de Entrada de video instalado:',IA);
if isempty(IA)||D==0
    msgbox({'no hay ningun adaptador de entrada de video instalado!',...
        'O',...
        'Intente de Nuevo y seleccione el adaptador apropiado.'})
     return 
end 
IA=char(IA);
IA=IA(D,:);
IA(IA==' ')=[];
x=imaqhwinfo(IA);
try
DeviceID=menu('seleccione ID de Dispositivo',x.DeviceIDs);
F=x.DeviceInfo(DeviceID).SupportedFormats;
nF=menu('seleccione el Formato',F);
Format=F{nF};
catch e
    warndlg({'intente con otro dispositivo  ';...
        'No esta instalado el dispositivo de enetrada de video'})
    return
end 
set(handles.v_previa,  'enable', 'on');
set(handles.control, 'enable', 'off');
% --- Executes on button press in v_previa.
function v_previa_Callback(hObject, eventdata, handles)
% hObject    handle to v_previa (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
global IA DeviceID Format VidObj cam
try
VidObj= videoinput(IA, DeviceID, Format);
handles.VidObj=VidObj;
vidRes = get(handles.VidObj, 'VideoResolution');
nBands = get(handles.VidObj, 'NumberOfBands');
set(handles.PRW,'Visible','off')
axes(handles.PRW)
hImage = image( zeros(vidRes(2), vidRes(1), nBands) );
preview(handles.VidObj, hImage)
catch E
    msgbox({'configure corectamente la camara!',' ',E.message},'CAM INFO')
end
guidata(hObject, handles);
set(handles.control,  'enable','on');
cam=0;
% --- Executes on button press in control.
function control_Callback(~, ~, handles)
% hObject    handle to control (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
 global  VidObj cam vid aviobj
if cam == 0
      [na,ca]=uiputfile({'*.avi'});
  %     nom = datestr(now, 'local');
  %     nombre = strcat(nom, '.avi');
      vid = VidObj;
      aviobj =  VideoWriter(fullfile(ca,na));
      vid.LoggingMode = 'disk&memory';
      vid.DiskLogger = aviobj;
      vid.TriggerRepeat = 300;
      start(vid);
      set(handles.control, 'String', 'PARAR');
      set(handles.control, 'ForegroundColor','black');
      set(handles.configuracion, 'enable', 'off');
      set(handles.v_previa, 'enable', 'off');
      cam = 1;
  else
      stop(vid);
  %     aviobj = 
      close(vid.DiskLogger);
      delete(vid);
      clear vid;
      clear aviobj;
      set(handles.control, 'String',  'GRABAR');
      set(handles.control,'ForegroundColor', 'red');
      set(handles.configuracion, 'enable','on');
      set(handles.v_previa, 'enable', 'on');
      cam = 0;
  end
% --- Executes on button press in salir.
function salir_Callback(~, ~, ~)
% hObject    handle to salir (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
clear all
close all

Best Answer

Set the FrameRate property of aviobj to an appropriate value. The default is 30 (frames per second)
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