Matlab - ¿grabar video en matlab?

v = VideoWriter('newfile.avi');

open(v)

writeVideo(v,captura3)

%% acá hago la adquisición de vídeo mediante un boton de start 

function pushbutton1_Callback(hObject, eventdata, handles)

url = ' *introducir ip* /shot.jpg';

framesAcquired = 0;

while (framesAcquired <= 5000000000000)

data = imread(url);

handles.captura=data;

framesAcquired = framesAcquired + 1;

drawnow;

imshow(data);

guidata(hObject, handles);

end

%% aca trato de capturar el video pero sale error

function pushbutton3_Callback(hObject, eventdata, handles)

captura3=handles.captura;

while (1)

v = VideoWriter('newfile.avi');

open(v)

writeVideo(v,captura3)

end

[na,ca]=uiputfile({'*.avi'});

w=VideoWriter(fullfile(ca,na));

w.FrameRate=25;

open(w);

for i=1:100

writeVideo(w,uint8(randi([0,256],300,300)))

end

close(w)

%aca adquiero la transmicion de la camara 

function pushbutton1_Callback(hObject, eventdata, handles)

url = 'http://192.168.1.2:8080/shot.jpg';

framesAcquired = 0;

while (framesAcquired <= 40000000)

data = imread(url);

framesAcquired = framesAcquired + 1;

drawnow;

imshow(data);

data2={data(framesAcquired)};

data2=cell(data2)

handles.captura=data2;

guidata(hObject, handles);

end

%aca trato de grabar el video

function pushbutton2_Callback(hObject, eventdata, handles)

captura3=handles.captura;

[na,ca]=uiputfile({'*.avi'});

w=VideoWriter(fullfile(ca,na));

w.FrameRate=25;

open(w)

for i=1:200

   frame=getframe;

  writeVideo(w,frame)

end

close(w)