hi there, i am having some dificulties with my GUI, i made a GUI to record video from my 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?

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

[Walter Roberson]

"clear all" should never appear in a function. "close all" is dubious too.

[jorge alejandro guerrero díaz]

i changed that, but it wansn't the problem.

Answer 1

[Walter Roberson]

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

[jorge alejandro guerrero díaz]

thanks,i have ran the program like 16 times and could see that the video goes too fast if i pause it in less than a minute, but when i let it go more than 30 second goes well but the problem now is that it just record a minute of the video then a problem about memory comes, look

Unable to allocate memory for an incoming image frame due to insufficient free physical memory.