Can't save a video with VideoWrite: Error [Frame must be 550 by 420]

% video traiettoria

v = VideoWriter('traiettoria');

open(v);%

figure

scatter(0,0,200,'r','filled','s');

hold on;

grid on, grid minor, axis equal;hold on;

title('traiettoria AUV in coordinate ne USBL');

xlabel('est (m)');hold on;

ylabel('nord (m)'); hold on;

curve = animatedline('Color','b','LineStyle','-','LineWidth',1);

for k = 1:length(t_raw_sec)

addpoints(curve,e_no_outliers(k),n_no_outliers(k))

drawnow;

frame = getframe(gcf);

writeVideo(v,frame);

end

close(v);

I can't save the video because the frames are not the same size, I suppose...any suggestion?Thanks!

Answer 1

[Image Analyst]

You need to set up the movie in advance so that all the frames are the same size. Here is a snippet you can modify.

% Set up the movie structure.
% Preallocate movie, which will be an array of structures.
% First get a cell array with all the frames.
allTheFrames = cell(numberOfFrames,1);
vidHeight = 344;
vidWidth = 446;
allTheFrames(:) = {zeros(vidHeight, vidWidth, 3, 'uint8')};
% Next get a cell array with all the colormaps.
allTheColorMaps = cell(numberOfFrames,1);
allTheColorMaps(:) = {zeros(256, 3)};
% Now combine these to make the array of structures.
myMovie = struct('cdata', allTheFrames, 'colormap', allTheColorMaps);

For a full demo, see my attached demo, movie_made_from_surf.m, where I make a movie out of a figure that I'm animating.