I just want the matlab code for converting a video into fewer frames .

is that possible for someone to help me with the code for converting the video into few number of frames?

Answer 1

[Walter Roberson]

Combining examples from the VideoWriter and VideoReader documentation pages:

http://www.mathworks.com/help/matlab/ref/videoreaderclass.html

%this part is straight from the VideoReader documentation

xyloObj = VideoReader('xylophone.mp4');

nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;

% Preallocate movie structure.
mov(1:nFrames) = ...
    struct('cdata', zeros(vidHeight, vidWidth, 3, 'uint8'),...
           'colormap', []);

% Read one frame at a time.
for k = 1 : nFrames
    mov(k).cdata = read(xyloObj, k);
end

start making it smaller

%now a change to write in fewer frames:

frame_keep_fraction = 1/3;   %for example

discard_frame = rand(1,nFrames) > frame_keep_fraction;

mov(discard_frame) = [];   %throw away those frames because we want a smaller video

done making it smaller

%now we can write. Adapting now from the VideoWriter documentation

writerObj = VideoWriter('peaks.avi');
open(writerObj);
writeVideo(writerObj, mov);    %we already have all the data so do not need to go frame by frame
close(writerObj);