Create working avi video.

2017 8 19
1 个回答
回答已采纳
更新时间：2017 8 27
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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.

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 采纳的回答

Image Analyst
Image Analyst 2017-8-19

0 个投票

Try
writeVideo(video, uint8(img));

6 个评论
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baxbear
baxbear 2017-8-19
Sorry to say this, but nothing changed -> still the same error
Image Analyst
Image Analyst 2017-8-19
编辑：Image Analyst 2017-8-19
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
baxbear 2017-8-20
编辑：baxbear 2017-8-20
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
baxbear 2017-8-22
didn't work because I used close in CreateVideo()
Image Analyst
Image Analyst 2017-8-22
So, is it solved now? Or do you still have a problem?
baxbear
baxbear 2017-8-27
编辑：baxbear 2017-8-27
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.

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