Why .mpeg video file does not work when comes to adding noise (Other file formats like .mpg works better ) ?

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Priyanka P 2018-10-15

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https://ww2.mathworks.cn/matlabcentral/answers/424170-why-mpeg-video-file-does-not-work-when-comes-to-adding-noise-other-file-formats-like-mpg-works-be

评论： Walter Roberson 2018-10-16

I have been trying to add noise (Gaussian) to .mpeg video file but error shows up (File is invalid). Pls let me know reasons of using .mpeg , if not, there is other reasons? Psychtoolbox is helpful for adding noises using .mpeg videos?

while hasFrame(Vptr)
%Read from video file
Img = readFrame(Vptr);
%Add noise to the image
Img = imnoise(Img,'gaussian', 0.6);
%write to video file
writeVideo(Wptr,Img);

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Priyanka P 2018-10-16

编辑：Priyanka P 2018-10-16

By definitation, Vptr = VideoReader(video.mpeg) and Wptr is VideoWriter obj that writes to other video file. I try using closing VideoWriter but still error shows up "file not vallid"

Walter Roberson 2018-10-16

"By definitation, Vptr = VideoReader(video.mpeg)"

Please confirm that you have a struct named video that has a field named mpeg that contains the name of a file; or else that you have an object of some kind with a property named mpeg that contains the name of a file; or else that you have an object of some kind with a method named mpeg that takes no arguments, and that the method returns the name of a file.

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