Create a video from a 4D array
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Alber
el 17 de Abr. de 2020
Comentada: Ameer Hamza
el 18 de Abr. de 2020
Hello, I have a problem in this code.
function [] = writeBufferToFinalVideo(buffer)
video = VideoWriter('example','MPEG-4');
video.FrameRate = 25;
open(video)
for i = 1:size(buffer,4)
img = buffer(i);
img(img>1) = 1;
img(img<0) = 0;
writeVideo(video,img);
end
close(video);
end
My buffer is a 4-dimensional array that has frames inside. It is composed of: (height, width, numChannels, framesPerSymbol). The latter is the number of frames that are in a symbol, that is, the size of my buffer.
In my opinion, I think the code is correct, but I always get an empty video without the frames in my buffer.
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Ameer Hamza
el 17 de Abr. de 2020
If buffer is a 4D-array, then you will need to index it like this
img = buffer(:,:,:,i);
9 comentarios
Ameer Hamza
el 18 de Abr. de 2020
I am glad to be of help.
Reason: if the datatype of the matrix is double, MATLAB considers the RGB color values between 0 and 1. Whereas, for your matrix, the values were given in an 8-bit format from 0 to 255. MATLAB takes all value over one as white (that is why you saw white video frames) Dividing by 255, normalizes the value between 0 and 1. I guess, the following will also work for your original code
writeBufferToFinalVideo(uint8(encodedBuffer));
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Image Analyst
el 18 de Abr. de 2020
Make sure buffer is uint8.
buffer = zeros(height, width, numChannels, framesPerSymbol, 'uint8')
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