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Accessing video frames in specific order MATLAB


Accessing video frames in specific order MATLAB

By : Sujata Bhat
Date : November 22 2020, 03:01 PM
should help you out i'm using matlab for video processing, vehicle plate detection, this is my code for show video in frame. that code is process all frame in 1 video , Try this:
code :
for dataframe=1:3:obj.NumberOfFrames
    LGi=read(obj,dataframe);

axes(handles.mpengujianavideo);
set(imshow(insertObjectAnnotation(LGi, 'rectangle', deteksipelat,'Plat')));
title(strcat('Frame ke-',mat2str(dataframe)));


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how to select specific frames from a video in MATLAB?

how to select specific frames from a video in MATLAB?


By : user7574263
Date : March 29 2020, 07:55 AM
this will help I would take the example for VideoReader and modify the code to explain -
code :
%%// Paramters
sampling_factor = 8;
resizing_params = [100 120];

%%// Input video
xyloObj = VideoReader('xylophone.mpg');

%%// Setup other parameters
nFrames = floor(xyloObj.NumberOfFrame/sampling_factor); %%// xyloObj.NumberOfFrames;
vidHeight = resizing_params(1); %// xyloObj.Height;
vidWidth = resizing_params(1); %// 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
    IMG = read(xyloObj, (k-1)*sampling_factor+1);
    %// IMG = some_operation(IMG);
    mov(k).cdata = imresize(IMG,[vidHeight vidWidth]);
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);
Extracting Frames From A Video In Matlab

Extracting Frames From A Video In Matlab


By : Tom Ge
Date : March 29 2020, 07:55 AM
I wish did fix the issue. I was trying to extract frames from a small video using the following lines of code : , Instead of MMREADER, I used the following lines of code :
code :
movieInfo = aviinfo(movieFullFileName);
mov = aviread(movieFullFileName);
% movie(mov);
% Determine how many frames there are.
numberOfFrames = size(mov, 2);
numberOfFramesWritten = 0;
video to frames in matlab

video to frames in matlab


By : user3045528
Date : March 29 2020, 07:55 AM
Hope this helps That error is due to your video file itself. From the looks of it, MATLAB has a problem reading that file probably because the file is badly encoded or the video was encoded with a codec that is not supported by MATLAB or does not exist on your computer.. See this question for a similar problem: no combination of intermediate filters could be found
This has nothing to do with MATLAB, but the error was what you encountered and the answer was to essentially re-encode the video file in a format that is compatible with your operating system and MATLAB.
How to read frames from a video MATLAB?

How to read frames from a video MATLAB?


By : angrycarbocation
Date : November 04 2020, 08:15 AM
it helps some times From the documentation:
code :
v = VideoReader('xylophone.mp4');

while hasFrame(v)
    video = readFrame(v);
end
video = read(v,[1 Inf]);
accessing frames in WPF video player

accessing frames in WPF video player


By : ramod8
Date : March 29 2020, 07:55 AM
To fix the issue you can do Over at MSDN, the info on frame stepping is hidden at the bottom of the page that is concerned with the scrubbing1 operation:
https://msdn.microsoft.com/en-us/library/windows/desktop/ee892370(v=vs.85).aspx
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