Using while loop in a video

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Eliska Paulikova
Eliska Paulikova 2022-10-25
编辑： KALYAN ACHARJYA 2022-10-25
Hello, My goal is to read a video, than split it to different number of frames, and than make it stop. It still does not work. Please help
vid=VideoReader("video.mp4");
k=200;
while hasFrame(vid)
frame=readFrame(vid);
numberOfFrames = vid.NumFrames;
framesToRead = 1:k: numberOfFrames;
limit=length(framesToRead);
for h = 1:length(framesToRead)
if h<limit
thisFrame = read(vid, framesToRead(h));
else
break
end
end
end
  1 个评论
Eliska Paulikova
Eliska Paulikova 2022-10-25
Well I have a video which has more than 100 000 frames --> So I need to read every 2000 frames. I now I have there the step k=200 but it suppose to be 2000
But still it does not work

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KALYAN ACHARJYA
KALYAN ACHARJYA 2022-10-25
编辑：KALYAN ACHARJYA 2022-10-25
vid=VideoReader('video.mp4');
frame_num=vid.NumFrames;
frame_format='.jpg';
vid=read(vid);
for i=1:frame_num %Initial Level: Check with less number of frames, e.g.i=1:5
frame_name=num2str(i);
file_name=strcat(frame_name,frame_format);
Vid_frame=vid(:,:,:,i);
imwrite(Vid_frame,file_name);%Save the frame in the current directtory
% Or you can save the frame(images) into specific directory also.
end
It's perfectly working in my system with sample video. Hope it Helps, good wishes!
Kalyan

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