how can i convert the video into frames and take snapshots of selected frames

i have used mmreader to read the video

Answer 1

[Christiaan]

Dear Sondhi,

You can use the "read" and "imshow" function to plot two frames. Instead of mmreader, VideoReader is now used. (after MATLAB R2010b). An example has been shown below how a video can be loaded into MATLAB, played and how a certain frame can be selected.

clc;clear all;close all;
xyloObj = VideoReader('xylophone.mpg', 'Tag', 'My reader object');
get(xyloObj)

xyloObj = VideoReader('xylophone.mpg');

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

% Size a figure based on the video's width and height.
hf = figure;
set(hf, 'position', [150 150 vidWidth vidHeight])

% Play back the movie once at the video's frame rate.
movie(hf, mov, 1, xyloObj.FrameRate);

% plot frame 6 and 60
figure(2)
plot = read(xyloObj, 6);
imshow(plot)
figure(3)
plot = read(xyloObj, 60);
imshow(plot)

Good luck! Christiaan