MATLAB: Problem with a conversion into avi file

video processing

Hi,I want to convert a stored images to avi file but when i run my code i get this error: Frames of type double must be in the range 0 to 1. Can anyone help me to solve the problem? Thanks in advance.

writerObj = VideoWriter('Uncompressed AVI.avi'); writerObj.FrameRate = 10;

open(writerObj);

[m n number]=size(sub_movie); %the images are stored in sub_movie for k = 1:number frame = sub_movie(:,:,k); writeVideo(writerObj,frame); end close(writerObj);

Best Answer

You just need to convert sub_movie(:,:,k) to a double before exporting. For example:

for k = 1:number 
writeVideo(writerObj,double(sub_movie(:,:,k))/65536); % store as 16-bit data (2^16 = 65536).
end 
close(writerObj);

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MATLAB: How to make a video of a graph with axes and axes labels

I found out how to solve it. The line frame = getframe; is changed to frame = getframe(gcf);

close all; clear all;
writerObj = VideoWriter('peaks.avi');
writerObj.FrameRate = 5;
open(writerObj);
Z = peaks; surf(Z); 
axis tight
set(gca,'nextplot','replacechildren');
set(gcf,'Renderer','zbuffer');
xlabel('x label')
ylabel('y label')
zlabel('z label')
for k = 1:20 
   surf(sin(2*pi*k/20)*Z,Z)
   frame = getframe(gcf);
   writeVideo(writerObj,frame);
end
close(writerObj);
winopen('peaks.avi')

MATLAB: I keep trying to convert a video grayscale but it gives me an error

Instead of rgb2gray(), use read() and pass it the frame number. Should look something like this:

% Loop through the movie, writing all frames out.
for frame = 1 : numberOfFrames
	% Extract the frame from the movie structure.
	thisInputFrame = read(inputVideoReaderObject, frame);
	
	% Display it
	image(thisInputFrame);
        if ndims(thisInputFrame) == 3
            thisInputFrame = rgb2gray(thisInputFrame);
        end
	axis on;
	axis image;
	caption = sprintf('Frame %4d of %d.', frame, numberOfFrames);
	title(caption, 'FontSize', fontSize);
	drawnow; % Force it to refresh the window.
	
	% Resize the image.
	outputFrame = imresize(thisInputFrame, [outputVideoRows, outputVideoColumns]);
	
	% Write this new, resized frame out to the new video file.
	writeVideo(outputVideoWriterObject, outputFrame);
	
	% Update user with the progress.  Display in the command window.
	progressIndication = sprintf('Processed frame %4d of %d.', frame, numberOfFrames);
	disp(progressIndication);
	% Increment frame count (should eventually = numberOfFrames
	% unless an error happens).
	numberOfFramesWritten = numberOfFramesWritten + 1;
end

Best Answer

Related Solutions

MATLAB: How to make a video of a graph with axes and axes labels

MATLAB: I keep trying to convert a video grayscale but it gives me an error

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