Azzera filtri
Azzera filtri

downsample from image 360*640 to 180*320

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hi to everyone , I would to ask two question . the first is place in the title , and i know that i'm going to lose data , but i need to. the image in question i frame in the code under
. the second is that i'm trying to execute this code , but somthing wrong append .
video1=VideoReader('Francesca-Michielin---No-Degree-Of-Separation-Italy-Live-at-Semi-Final-2.mp4');
video2=VideoReader('Jamala---1944-Ukraine-Live-at-Semi-Final-2-of-the-2016-Eurovision-Song-Contest.mp4');
videoOut=VideoWriter('provaMix.avi');
videoOut.FrameRate=video1.FrameRate;
open(videoOut)
frames=read(video1,[1 2316]);
for frame=frames
% eventualmente resize (downsampling) del frame
writeVideo(videoOut,frame);
end
thank so much

Risposta accettata

Ameer Hamza
Ameer Hamza il 22 Mag 2020
See imresize(): https://www.mathworks.com/help/releases/R2020a/matlab/ref/imresize.html. Use it with a scaling factor of 0.5;
frame_small = imresize(frame, 0.5)
For videoReader object, use readFrame() function to read a frame at a time, as shown in this example:: https://www.mathworks.com/help/releases/R2020a/matlab/ref/videoreader.html#busqe2j-1_1

Più risposte (1)

Andrea Gusmara
Andrea Gusmara il 22 Mag 2020
Thanks you for your answer. For the second question, is there any function that permits to read more frames? I have seen the functions readFrame and read. I have read the documentation about the latter function but I couldn't use it very well. The documentation said that a frame range could be recovered
  3 Commenti
Andrea Gusmara
Andrea Gusmara il 22 Mag 2020
No errors, the function returned only a value
Ameer Hamza
Ameer Hamza il 22 Mag 2020
Your for loop is wrong. Write it like this
frames=read(video1,[1 2316]);
for idx=1:2316
% eventualmente resize (downsampling) del frame
writeVideo(videoOut,frames(:,:,:,i));
end

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