converting video to images by secends

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caesar
caesar 2017-12-8
评论： KSSV 2020-1-30
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?

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回答（1 个）

KSSV
KSSV 2017-12-8
Try this:
vidObj = VideoReader('myvideopath');
numFrames = 0;
while hasFrame(vidObj)
F = readFrame(vidObj);
numFrames = numFrames + 1;
imagesc(F)
drawnow
end
numFrames
  3 个评论
显示 1更早的评论
Saif Sayed
Saif Sayed 2020-1-30
Undefined function 'hasFrame' for input arguments of type 'VideoReader'.
Error in VIDEO (line 3)
while hasFrame(vidObj)
can someone sort this error
KSSV
KSSV 2020-1-30
hasFRame is introduced in 2014b.....what version you are using?

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