Playing .avi in linux - matlab

Question

I have written a code to save two movies in Matlab. The problem is that, the movie "graphh.avi" is consist of first movie("chert") also. I want it to show just graphs and not the first saved movie("chert.avi").
Could anyone help? Any answer is highly appreciated.
clear all
close all
cla
h = plot(x, y, '.g', 'MarkerSize', 10);
set(gca,'Color',[0 0 0]);
set(gcf,'doublebuffer','on')
set(gca,'YTick',[]);
set(gca,'XTick',[]);
plot(x,y,'.g','markersize',10)
drawnow
currFrame = getframe;
writeVideo(vidObj,currFrame);
h = plot(x, y, '.g', 'MarkerSize', 10);
drawnow
hist(blocksize)
currFrame = getframe;
writeVideo(vid,currFrame);
end
close(vidObj);
close(vid)
The code after doing the first answer becomes as below. The problem solved but there is another problem now: black movie with green points became so messy.
clear all
close all
l = 20;
r = 3;
v = 0.5;
dt = 1;
nn=200;
figure(h1); % set figure 1 as current figure
h = plot(x, y, '.g', 'MarkerSize', 10);
set(gca,'Color',[0 0 0]);
set(gcf,'doublebuffer','on')
set(gca,'YTick',[]);
set(gca,'XTick',[]);
plot(x,y,'.g','markersize',10)
drawnow
currFrame = getframe(h1); % gets only figure 1
writeVideo(vidObj,currFrame);
h = plot(x, y, '.g', 'MarkerSize', 10);
drawnow
figure(h2); % set figure 2 as current figure
hist(blocksize)
currFrame = getframe(h2); % gets only figure 2
writeVideo(vid,currFrame);
end
close(vidObj);
close(vid);

Answer 1

Use figures handles when calling getframe. See how I modified your code:
% some code...
vvy = v.*sin(tetha);
h1 = figure('Color',[0 0 0])
axis([0 l 0 l])
% some more code...
h2 = figure
hold on
vid = VideoWriter('graphh.avi');
% and more code...
% for loop
figure(h1); % set figure 1 as current figure
% plot whatever on this figure
currFrame = getframe(h1); % gets only figure 1
writeVideo(vidObj,currFrame);
% blah blah...
figure(h2); % set figure 2 as current figure
% plot whatever on this figure
currFrame = getframe(h2); % gets only figure 2
writeVideo(vid,currFrame);
% end of loop
EDIT:
in your modified code you're calling h = plot(x, y, '.g', 'MarkerSize', 10); three times in a row for no reason, so get rid of it. the problem you encountered stems from plotting another set of point in addition to the previous one, so the axes get filled with points. One solution for that is to use set(h,'XData',x,'YData',y) like so:
figure(h1); % set figure 1 as current figure
set(gca,'Color',[0 0 0]);
set(gcf,'doublebuffer','on')
set(gca,'YTick',[]);
set(gca,'XTick',[]);
if exist('h','var') && ishandle(h) % if handle exists just change coordinates
set(h,'XData',x,'YData',y)
else % only for the first time you plot that
h = plot(x, y, '.g', 'MarkerSize', 10);
end
drawnow
currFrame = getframe(h1); % gets only figure 1
writeVideo(vidObj,currFrame);