copying AVI files by using Matlab

Hi everyone

The following two Matlab code (which they do copy new avi files from another)

First one:

- By using VideoWriter

clear all;

close all; %%%%%%%%%%%%%%%%%%%%%%%

[filename pathname] = uigetfile('*.avi','File Selector');

vid = strcat(pathname, filename);

obj = mmreader(vid);

vid = read(obj);

Frames = obj.NumberOfFrames;

new10=VideoWriter('output10.avi');

 for x = 1 : Frames

      blocks{x}=vid(:,:,:,x);

end

open(new10);

for f=1:1

    ss=im2frame(blocks{f});

    writeVideo(new10,ss);

end

close(new10);

 msgbox('end of operation','Message','warn');

Second one:

- By using avifile

close all

clear all

 [filename pathname] = uigetfile('*.avi','File Selector');

vid = strcat(pathname, filename);

obj = mmreader(vid);

vid = read(obj);

frames = obj.NumberOfFrames;

%%

new10=avifile('output10.avi','compression','None');

for x = 1 : frames

    a=vid(:,:,:,x);

    blocks{x}=a;

end

%%

for f=1:frames

    new10=add frame(new10,blocks{f});

end

new10=close(new10);

msgbox('end of operation','Message','warn');

After running the first one program the new avi file is different from the original file (the pixels of frames are different).

While, after running the first one program the new avi file is same asthe original file (the pixels of

frames are similar).

Please inform me the reason

Best regards

Majid

[Image Analyst]

Please read this link and edit/fix your post.

In short, highlight your code, and click the {}Code button.

[Jan]

@Majid Al-Sirafi: Image Analyst is right: Your code is really hard to read. Please remove the empty lines and use the "{} Code" button. You will see that it inserts two leading spaces and an empty line before and after the code. Finally it will not hurt anymore to read the code.

Omit the darn clear all. There is no benefit in removing all loaded functions from the memory and waste time with reloading them from the slow hard disk.

What differences do you observe? Are the pixels completely different, or might it be a problem of the color map or a rounding effect? Does the compression play a role?

[Majid Al-Sirafi]

hi dear Jan this is first one

close all

clear all

[filename pathname] = uigetfile('*.avi','File Selector');

vid = strcat(pathname, filename);

obj = mmreader(vid);

vid = read(obj);

Frames = obj.NumberOfFrames;

new10=VideoWriter('output10.avi');

 for x = 1 : Frames
      blocks{x}=vid(:,:,:,x);
  end
  open(new10);
for f=1:1
    ss=im2frame(blocks{f});
    writeVideo(new10,ss);
end
close(new10); 
 msgbox('end of operation','Message','warn');

and this second one

close all

clear all

 [filename pathname] = uigetfile('*.avi','File Selector');

vid = strcat(pathname, filename);

obj = mmreader(vid);

vid = read(obj);

frames = obj.NumberOfFrames;

new10=avifile('output10.avi','compression','None');

for x = 1 : frames

    a=vid(:,:,:,x);

    blocks{x}=a;

end

for f=1:frames

    new10=addframe(new10,blocks{f});

end

new10=close(new10);

msgbox('end of operation','Message','warn');

regards

Majid

[Majid Al-Sirafi]

these two files

Answer 1

[Image Analyst]

Why not simply use copyfile()?

[Majid Al-Sirafi]

Actually, this copy is the first step in video processing. later I want to develop this procedure in another processing not just for copying

best regards Majid