converting video to images by secends

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caesar
caesar on 8 Dec 2017
Commented: KSSV on 30 Jan 2020
Hi I am trying to convert a video( MP4) to images such that the number of resulted images are same as the length of the video in seconds. for example, 2 minutes video would be 120 images each image is representing one second shot from the video. i have tried the following code
%
path = fullfile('C:\','Users','user','Downloads','data_test','videos');
movieFullFileName = fullfile(path, 'GP020165.mp4');
v = VideoReader(movieFullFileName)
D=v.Duration
[path, baseFileName, extentions] = fileparts(movieFullFileName);
path = pwd;
outputFolder = sprintf('%s/Movie Frames from %s', path, baseFileName);
if ~exist(outputFolder, 'dir')
mkdir(outputFolder);
end
for k = 1:D
this_frame = readFrame(v);
outputBaseFileName = sprintf('Frame %4.4d.jpg', k);
outputFullFileName = fullfile(outputFolder, outputBaseFileName);
imwrite(this_frame, outputFullFileName, 'jpg')
end
Although I got the correct number of images, the division was based on the frame (considering the video frame rate was 30FPS) so I ended up losing almost 80% percent of the video content.
I think the problem is in these lines
for k = 1:D
this_frame = readFrame(v);
any suggestion about what to change in the code above?

Answers (1)

KSSV
KSSV on 8 Dec 2017
Try this:
vidObj = VideoReader('myvideopath');
numFrames = 0;
while hasFrame(vidObj)
F = readFrame(vidObj);
numFrames = numFrames + 1;
imagesc(F)
drawnow
end
numFrames
  3 Comments
Saif Sayed
Saif Sayed on 30 Jan 2020
Undefined function 'hasFrame' for input arguments of type 'VideoReader'.
Error in VIDEO (line 3)
while hasFrame(vidObj)
can someone sort this error
KSSV
KSSV on 30 Jan 2020
hasFRame is introduced in 2014b.....what version you are using?

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