動画ファイルから画像ファイルに変換

I understand that you want to convert a video file into ‘jpg’ files and assume that you want to save the individual frames from the videos as images. You can use the “VideoReader” class for performing this task. Following is a sample code that performs the task:

v = VideoReader('your_video_file.mp4');
numberOfFrames = v.NumFrames;
for frame = 1: numberOfFrames
	% Extract the frame
	thisFrame = read(v, frame);
	% Display it
	image(thisFrame);
	drawnow;
    outputBaseFileName = sprintf('Frame %4.4d.jpg', frame);
    outputFullFileName = fullfile('./', outputBaseFileName);
	frameWithText = getframe(gca);
    imwrite(frameWithText.cdata, outputFullFileName, 'jpg');
end

For larger videos, you can consider processing the video in smaller chunks or frames. Additionally, using video compression techniques or converting the video to a lower resolution or different format can help reduce the file size and make it more manageable for processing.

You can read more about the “VideoReader” class here:

https://www.mathworks.com/help/matlab/ref/videoreader.html

Hope this helps!

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Jaynik 2023-10-25

Using "imwrite" after reading the frame would be better for larger files. The given code is just a sample to get frames and should be edited as per the use case.

Dyuman Joshi 2023-10-25

Yes, and you read the frame using read, so once again, there is no need to use getframe().

And your answer still does not recognize the problem OP is facing, let alone address it.

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