Create working avi video.

Always when I try to create an .avi video out of matrices I get the following error: Invalid video data - must be numeric or logical data type.

        function [video] = CreateVideo(obj)
            video = VideoWriter('test.avi');
            video.FrameRate = 1;
            open(video)

            % loop 2d matrix sequence with ones and zeros and create video
            for i_inc = 1 : size(obj.square_move_seq_, 3)
                gray_img = double(obj.square_move_seq_(:, :, i_inc));
                img = cat(3, gray_img, gray_img, gray_img);
                writeVideo(video, img);
            end

            % Finalize the video file.
            close(video);
        end

Does somebody have a clue what I do wrong?

Thank you very much in advance.

Answer 1

[Image Analyst]

Try

writeVideo(video, uint8(img));

[baxbear]

Sorry to say this, but nothing changed -> still the same error

[Image Analyst]

Please give the ENTIRE error message - ALL the red text - not just a small snippet snipped out of it.

You can see my attached demos for a way that works.

Also explain why you convert grayImage to double(). Why??? Did someone incorrectly tell you to do that?

[baxbear]

There is no red text, what I have is only the error message in the implay window (Invalid video data - must be numeric or logical data type.)

clear all
clc

sq = TestSquare(10, [1, 1]);
sq.Move(1, 1);
sq.NextStep();
sq.Move(1, 2);
sq.NextStep();
% CreateVideo() is a method from TestSquare
implay(sq.CreateVideo())

PS.: I used double because I was hoping to fix the error this way.

[baxbear]

didn't work because I used close in CreateVideo()

[Image Analyst]

So, is it solved now? Or do you still have a problem?

[baxbear]

Yes, this particular problem is solved. I still have some problems with the visualisation but I will open a separate thread for it.

Thank you very much.