How to extract frames from a .mp4 video?

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Anthony Andrews
Anthony Andrews 2019-11-30
回答： Boyuan Li 2020-5-14
Hi I am trying to combine two videos in matlab. The first video is a clock moving with a green background. The second video is a black video moving in what it looks like is space. I am trying to extract the frames and make the second video the background to the first video. Using the code below only extracts the first frame, how can i extract all frames?
outputFolder1=('video');
v1=VideoReader('Clock.mp4');
vid1Frames=readFrame(v1);
for frame=1:size(vid1Frames,4)
outputBaseFileName=sprintf('%3.3d.png',frame);
outputFullFileName=fullfile(outputFolder1,outputBaseFileName);
imwrite(vid1Frames(:,:,:,frame),outputFullFileName,'png');
end

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回答（2 个）

Stephan
Stephan 2019-12-1
编辑：Stephan 2019-12-1
outputFolder1=('video');
v1=VideoReader('Clock.mp4');
vid1Frames=read(v1);
for frame=1:size(vid1Frames,4)
outputBaseFileName=sprintf('%3.3d.png',frame);
outputFullFileName=fullfile(outputFolder1,outputBaseFileName);
imwrite(vid1Frames(:,:,:,frame),outputFullFileName,'png');
end
Boyuan Li
Boyuan Li 2020-5-14
Somehow the function readFrame() only read the first available frame instead of the whole video.
outputFolder1=('video');
v1=VideoReader('Clock.mp4');
while hasFrame(v1)
frame=readFrame(v1);
outputBaseFileName=sprintf('%3.3d.png',frame);
outputFullFileName=fullfile(outputFolder1,outputBaseFileName);
imwrite(frame,outputFullFileName,'png');
end

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