Selecting smaller grid from a grid to create a video

Hi,

I would like to be able to pick different sections of a X by X grid to create a video.

My attempts are useless.

I generated some code using Gemini and I got the borders I needed.

I use the borders to dampen out a wave. I create a SPICE netlist and

https://drive.google.com/file/d/10v7PNSlfbvr56R9Tuc1L0gNZZExylHxR/view?usp=sharing

I need some code that allows me to ignore the border area when creating a video (the no damping part)

from the SPICE data output file. For example if I have a 150 by 150 grid, I would like to use only a 100 by 100 grid

for the video.

Thanks

Answer 1

[Mathieu NOE]

hello Andrew

see this code demo to read the video , extratct each frame then crop the unwanted borders and save back to a video output file

% Create a VideoReader object for the (input) MP4 file
videoFile = '09-09-25 Exp100100.mp4 '; 
videoObj = VideoReader(videoFile);

% Display video properties
disp(videoObj);

% Create a VideoWriter object for the output video file and open the object for writing.
v = VideoWriter("output_video.mp4");
open(v)
% define grid size (output frame size)
mt = 100;
nt = 100;

% Read , display , crop and save frames
while hasFrame(videoObj)
    frame = readFrame(videoObj); % Read the next frame
    % % display (optionnal) 
    % imshow(frame);               % Display the frame
    % pause(1/videoObj.FrameRate); % Pause to match the video frame rate
    % crop frame
    [m,n,p] = size(frame);
    delta_m = floor((m-mt)/2);
    delta_n = floor((n-nt)/2);
    frame_out = frame(delta_m:m-delta_m-1,delta_n:n-delta_n-1,:);
    % write video
    writeVideo(v,frame_out);
end

% Close the VideoWriter object.
close(v)

[Andrew]

Thank you very much. I will have a go.

[Mathieu NOE]

as always , my pleasure