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

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?

[Ameer Hamza]

Do you want to keep the duration the same as before, or all videos will have an equal duration?

[KSSV]

You can do interpolation. Read about interp1, interpn.

[NAVNEET NAYAN]

@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]

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

Answer 1

[Ameer Hamza]

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);