在 linux 中播放 .avi

Question

我写了一段代码，可以在 Matlab 中保存两部电影。问题是，电影 "graphh.avi" 也是由第一部电影 ("chert") 组成的。我希望它只显示图表而不是第一个保存的电影 ("chert.avi")。有人能帮忙吗？非常感谢任何答案。

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)

完成第一个答案后的代码如下。问题解决了，但是现在又出现了一个问题：黑色电影绿点变得很乱

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

调用时使用数字句柄getframe。看看我是如何修改你的代码的：

% 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

编辑：

在您修改后的代码中，您无缘无故地连续三次调用 h = plot(x, y, '.g', 'MarkerSize', 10);，因此请删除它。您遇到的问题源于在前一组点 之外绘制另一组点 ，因此轴上充满了点。一种解决方案是像这样使用 set(h,'XData',x,'YData',y)：

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);

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