hello,
I tried to import avi-files from a folder, using the following code
addpath(genpath('C:\Desktop\Thesis_Code'));
bending=dir('bend'); 
no_files_bend = size(bending,1);
for i=3:no_files_bend
    bend =bending(i).name;
    Vid = mmreader('bend')
    for j=1:length(Vid)
        imwrite(Vid(i).cdata,[num2str(i) '.jpeg']);
    end
 end

but i got this error message, 

??? Error using ==> aviinfo at 85
Unable to open bend.avi for reading.

Error in ==> aviread at 49
info = aviinfo(filename,'Robust');

Does anyone has any idea on how to solve it?
Thank you in advance!!

Kaoutar 

kaoutar wrote:
> hello,
> I tried to import avi-files from a folder, using the following code
> addpath(genpath('C:\Desktop\Thesis_Code'));
> bending=dir('bend'); no_files_bend = size(bending,1);
> for i=3:no_files_bend
>    bend =bending(i).name;
>    Vid = mmreader('bend')

Vid = mmread(bend);

with no quotes around bend. 'bend' is a literal string with four characters; 
without the quotes it designates the contents of the variable with that name.

>    for j=1:length(Vid)
>        imwrite(Vid(i).cdata,[num2str(i) '.jpeg']);
>    end
> end
> 
> but i got this error message,
> ??? Error using ==> aviinfo at 85
> Unable to open bend.avi for reading.

Walter Roberson <roberson@hushmail.com> wrote in message <i3f8lt$4if$1@canopus.cc.umanitoba.ca>...
> kaoutar wrote:
> > hello,
> > I tried to import avi-files from a folder, using the following code
> > addpath(genpath('C:\Desktop\Thesis_Code'));
> > bending=dir('bend'); no_files_bend = size(bending,1);
> > for i=3:no_files_bend
> >    bend =bending(i).name;
> >    Vid = mmreader('bend')
> 
> Vid = mmread(bend);
> 
> with no quotes around bend. 'bend' is a literal string with four characters; 
> without the quotes it designates the contents of the variable with that name.
> 
> >    for j=1:length(Vid)
> >        imwrite(Vid(i).cdata,[num2str(i) '.jpeg']);
> >    end
> > end
> > 
> > but i got this error message,
> > ??? Error using ==> aviinfo at 85
> > Unable to open bend.avi for reading.

Dear Walter,

Thanks a lot for your reply, I have used the mmread with no quotes around bend, but I am getting another error message which i couldn't solve, it states that:

??? Error using ==> FFGrab
Unable to open file

Error in ==> mmread at 146
        FFGrab('build',filename,fmt,double(disableVideo),double(disableAudio),double(trySeeking));

Please let me know if you have any idea on how to solve it...
thank you in advance

"Kaoutar " <azimane_k@hotmail.com> wrote in message <i3go5g$cku$1@fred.mathworks.com>...
> Walter Roberson <roberson@hushmail.com> wrote in message <i3f8lt$4if$1@canopus.cc.umanitoba.ca>...
> > kaoutar wrote:
> > > hello,
> > > I tried to import avi-files from a folder, using the following code
> > > addpath(genpath('C:\Desktop\Thesis_Code'));
> > > bending=dir('bend'); no_files_bend = size(bending,1);
> > > for i=3:no_files_bend
> > >    bend =bending(i).name;
> > >    Vid = mmreader('bend')
> > 
> > Vid = mmread(bend);
> > 
> > with no quotes around bend. 'bend' is a literal string with four characters; 
> > without the quotes it designates the contents of the variable with that name.
> > 
> > >    for j=1:length(Vid)
> > >        imwrite(Vid(i).cdata,[num2str(i) '.jpeg']);
> > >    end
> > > end
> > > 
> > > but i got this error message,
> > > ??? Error using ==> aviinfo at 85
> > > Unable to open bend.avi for reading.
> 
> Dear Walter,
> 
> Thanks a lot for your reply, I have used the mmread with no quotes around bend, but I am getting another error message which i couldn't solve, it states that:
> 
> ??? Error using ==> FFGrab
> Unable to open file
> 
> Error in ==> mmread at 146
>         FFGrab('build',filename,fmt,double(disableVideo),double(disableAudio),double(trySeeking));
> 
> Please let me know if you have any idea on how to solve it...
> thank you in advance

Hello Walter,

I could solve the problem, instead of mmread i used aviread and with no quotes.
Thanks a lot !!

Kaoutar