time of source and copied movie

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Majid Al-Sirafi 2015-11-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253929-time-of-source-and-copied-movie

评论： Walter Roberson 2015-11-11

Hi everyone

I had written a program with Mat lab. This program makes copy for movie from source movie. When I play two movies, the time of the source movie file is less than the copied file. So, how to make the time of source movie same as the copied movie

please see the following code

clear all;
close all;
%%%%%%%%%%%%%%%%%%%%%%%
[filename pathname] = uigetfile('*.avi','File Selector');
vid = strcat(pathname, filename);
obj = mmreader(vid);
vid = read(obj);
frames = obj.NumberOfFrames;
new10=avifile('copied_movie.avi','compression','None');
    for x = 1 : frames
      blocks{x}=vid(:,:,:,x);
  end
  for f=1:frames
          new10=addframe(new10,blocks{f}); % the result is red movie
  end
  new10=close(new10); 
   msgbox('end of operation','Message','warn');

Regards,

Majid

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Chad Greene 2015-11-9

I assume your application is more complex than simply copying the file, but if you're only trying to copy the file you can use copyfile.

Majid Al-Sirafi 2015-11-9

Really, i do not need just copy, but i want to do some operations(change color, drop frame from movie.. etc.) on the original movie file and then produce a new movie after the operations. The time of produced movie is more than the original movie

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Answer 1

Walter Roberson 2015-11-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/253929-time-of-source-and-copied-movie#answer_199173

The obsolete routine avifile() uses a default 'FPS' (frames per second) of 15. If your original movie has a different rate then the time of the resulting movie will be different.

You should be switching to VideoWriter from avifile(), but still you need to remember to set the frame rate.