The problem I'm currently facing is I had used " obj = videoinput(adaptorname,deviceID); " to obtain the video data for analysis; but when I use the function "obj = VideoReader('abc.mp4');" some of the operations like " set(vid, 'FramesPerTrigger', Inf); " don't work with VideoReader as a result I'm not able to do the required analysis on saved mp4, mpg files.
How should I go about this problem?
I'm trying to track distinct coloured objects from a saved video and plot there centroids versus time.
You have to convert the video frames into images first. You can use the following code to do that:
obj=VideoReader(filename); %Read the video
vidFrames=read(obj); %Capture the video frames
Then run a loop and read frame one by one
I=vidFrames(:,:,:,i); %i--> Frame Number
Hope this will help you in your endeavor.
I agree with @Shahed. Many of the functionalities of VideoReader have been removed in the newer versions of MATLAB. Conversion to individual frames will speed up your code too.
Another option is to use Video Reader and then perform analysis per frame, however this will be relatively slow.
In Matlab regarding video it is good to work on single frames. The management of the entire video is not really well supported
For the video analysis in Matlab there are several things you have to consider.
(1) Read Saved Video:
VideoFileReader = vision.VideoFileReader('VideoFileName');
(2) Read Saved imagese:
VideoFileReader = imread(fullfile(folder, imgName));
(3) Reading Live Video
videoFileReader =imaq.VideoDevice('winvideo', 1, 'RGB24_640x480','ROI', [1 1 640 480]);
Hope it will help you.
Dear Sameer Meshram,
Look the link. May be useful.
http://www.mathworks.com/help/vision/ref/vision.videofilereader-class.html?requestedDomain=www.mathworks.com
http://www.academia.edu/1744320/Introduction_to_Video_Analysis_using_MATLAB
Regards, Shafagat
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