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Matlab VideoReader codec error?


Matlab VideoReader codec error?

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Matlab VideoReader codec error?
Tag : linux , By : Brownell
Date : November 25 2020, 01:01 AM


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Matlab VideoReader on Ubuntu, quicktime codec


Tag : matlab , By : phil
Date : March 29 2020, 07:55 AM
this one helps. I have solved it. I'd like to explain how, but I really have no clue. After several upgrades, dist-upgrades, ppa's added, etc. I got it to work.
I hope if anyone finds this can at least use some of the comments to help out.

Does Python have an equivalent of VideoReader in Matlab?


Tag : python , By : user135518
Date : March 29 2020, 07:55 AM
wish of those help I found the answer here:OpenCV 2.4 VideoCapture not working on Windows
As I was using OpenCV 3.00 I thought that I had to copy the opencv_ffmpeg.dll from

Matlab VideoReader take unexpected time


Tag : matlab , By : ikey
Date : March 29 2020, 07:55 AM
hope this fix your issue With a typical video codec you can't decode frames individually, decoding always starts at a keyframe. Let's assume keyframes are 1,11,21,... While the real strategies are probably a little more advanced, just assume the first 10 frames are decoded at once and put into a cache, assuming that frame 2 to 10 are needed slightly after reading frame 1. This means you get 10 frames at a price of processing 1 keyframe and 9 difference frames.
Now your loop, for the first iteration frame 1 and 2 is read and probably removed from the cache (who expects someone to read the same frame twice?). Now you read frame 2 and 3, 2 is not found so decoding has to start over again. For the 10th iteration where you read frame 10 and 11 it's the worse. The codec probably dropped frame 10 earlier so frame 1 to 10 are decoded again. Making this single last loop more expensive than reading full 10 frames in order, 2 keyframes and 9 difference frames are processed.
Video = VideoReader('test_E.avi');
GrayImage1 = rgb2gray(read(Video, 1));
for k = 1:1:100
 GrayImage0 = GrayImage1;
 GrayImage1 = rgb2gray(read(Video, k+1));
end
imshow(GrayImage0); 

MATLAB: VideoReader error checking


Tag : matlab , By : cynix
Date : March 29 2020, 07:55 AM
I hope this helps . You may use ffmpeg for checking the integrity of video file.
See: How can I check the integrity of a video file (avi, mpeg, mp4…)?
filename = 'input.avi';

if (isunix)
    [status, cmdout] = system(['ffmpeg.exe -v error -i ', filename, ' -f null - 2']);
else
    [status, cmdout] = system(['ffmpeg.exe -v error -i ', filename, ' -f null - 2>&1']);
end

if (status ~= 0)
   %Dispaly cmdout if file is damaged.
   disp([filename, ' is corrupted.  Error: ', cmdout]);
end

Matlab's VideoReader not working on Ubuntu 17.04


Tag : matlab , By : Roel van Dijk
Date : March 29 2020, 07:55 AM
Hope this helps A colleague of mine found a link to a post that solved my problem https://www.mathworks.com/matlabcentral/answers/329796-issue-with-libstdc-so-6
Essentially, you need to redirect MATLAB and tell it to not use its default libstdc++6 file and use your Linux system's instead. I went with the solution at the bottom, and wrote an alias for my .bashrc file.
alias matlab='LD_PRELOAD=/usr/lib/x86_64-linux-gnu/libstdc++.so.6.0.22 /usr/local/bin/matlab -desktop'
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