saved movie in matlab cannot be played - matlab

Question

I have created a movie in matlab and I want to save it. I wrote below code to do that, it shows the movie when the code is running correctly but the file which have been saved, can not be played. The error is: "could not determine type of stream"
clear all
close all
l = 27;
r = 4; noise_t = 0.02; v0 = 0.1; nn = 300;
x = rand(1,nn).*l; y = rand(1,nn).*l; vx = 0.1.*(rand(1,nn)-0.5.*ones(1,nn)); vy = 0.1.*(rand(1,nn)-0.5.*ones(1,nn));
figure('Color',[0 0 0])
axis([0 115 0 40])
axis('square')
hold on
vidObj = VideoWriter('che.avi');
open(vidObj);
time = 900;
neigh=[];
eigh=[];
for t = 1:time;
eig=[];
for number = 1:nn;
distance(1:nn) = (ones(1,nn).*x(number)-x).^2 + (ones(1,nn).*y(number)-y).^2;
neighbour_s = distance < r^2;
eig(1,nn) = sum(neighbour_s);
a = dot(double(neighbour_s),vx)/(sum(neighbour_s));
b = dot(double(neighbour_s),vy)/(sum(neighbour_s));
vx1(number) = a/norm([b,a]); vy1(number) = b/norm([b,a]); mvx(number) = vx1(number); mvy(number) = vy1(number);
end
vx_center = noise_t .*(rand(1,nn)-0.5); vy_center = noise_t .*(rand(1,nn)-0.5);
vx = mvx + vx_center; vy = mvy + vy_center;
x = x + vx; y = y + vy;
index = (x < 0); x(index) = rem(x(index),l) + l;
index = (y < 0); y(index) = rem(y(index),l) + l;
index = (x > l); x(index) = rem(x(index),l);
index = (y > l); y(index) = rem(y(index),l);
eigh = [eigh;eig];
cla
vecc=eigh(:);
vecc= vecc(find(vecc>0));
hist(vecc,80)
drawnow
currFrame = getframe;
writeVideo(vidObj,currFrame);
drawnow
end

Answer 1

It is necessary for you to explicitly close the VideoWriter object using the close method when you are done writing new frames to it. This will finalize the video and make it playable.
% At the end of your script
close(vidObj)