How to make number of frames equal of several videos having different length and having different number of frames?

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NAVNEET NAYAN 2020-10-21

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https://ww2.mathworks.cn/matlabcentral/answers/621133-how-to-make-number-of-frames-equal-of-several-videos-having-different-length-and-having-different-nu

回答： Ameer Hamza 2020-10-21

I have several videos of different lengths. Correspondilgy, every video has got different number of frames. I want to make every video equal in terms of number of frames. For eg. I have five videos having 21, 28, 8, 104 and 62 frames respectively. I want to make number of frames 32 for every video. Is there any solution for this problem?

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NAVNEET NAYAN 2020-10-21

编辑：NAVNEET NAYAN 2020-10-21

@Ameer Hamza... I want to keep the number of frames equal. Their duration may vary.

In case, I am not able to clear my problem, feel free to comment

NAVNEET NAYAN 2020-10-21

@KSSV... Ok I will read the interp1 and interpn.

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Ameer Hamza 2020-10-21

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/621133-how-to-make-number-of-frames-equal-of-several-videos-having-different-length-and-having-different-nu#answer_520463

在 MATLAB Online 中打开

This shows how to write the video with fixed number of frames

num_frames = 32; % number of frames in out.mp4
TotalTime = 2; % out.mp4 will be 2 seconds
v = VideoReader('xylophone.mp4');
frames = read(v, [1 inf]);
frames = permute(frames, [4 1 2 3]);
frames_out = uint8(interp1(linspace(0,1,size(frames,1)), double(frames), linspace(0,1,num_frames)));
frames_out = permute(frames_out, [2 3 4 1]);
V = VideoWriter('out.mp4', 'MPEG-4');
V.FrameRate = 32/TotalTime;
open(V);
writeVideo(V, frames_out);
close(V);