error in making video file

i have a code which is instructed in matlab itself for video writing. the code is as follows.

videoFReader = vision.VideoFileReader('C:\Users\NAVEEN\Desktop\samp.avi');
    videoFWriter = vision.VideoFileWriter('myFile.avi', ...
                         'FrameRate', videoFReader.info.VideoFrameRate);
    % write the first 50 frames of viplanedeparture.avi into myFile.avi
    for i=1:50
       videoFrame = step(videoFReader);
       step(videoFWriter, videoFrame);  % write video to myFile.avi
    end
    release(videoFReader); % close the input file
    release(videoFWriter); % close the output file

but when i run this code i am getting error

Error using VideoFileWriter/step
Could not start the filter graph : Access is denied.

Error in Untitled1 (line 7)
       step(videoFWriter, videoFrame);  % write video to myFile.avi

what is wrong with this code i am using r2013a matlab please help me... thank u in advance

Answer 1

[Walter Roberson]

I suspect you do not have permission to write 'myFile.avi' in whichever directory you happen to be in. Have you considered provided the entire path to be sure that it goes on to your desktop ?

[Naveen C C]

thank u a lot. its working when i give complete path for videofilewriter. i.e vision.VideoFileWriter('C:\Users\NAVEEN\Desktop\myfile.avi','FrameRate', videoFReader.info.VideoFrameRate');

thank u once again

[Naveen C C]

how to compress the video after saving it. its taking lot of memory (like 600mb for 24sec video).

Answer 2

[Kazem Gheysari]

I solved this error, by changeing the folder that is goning to create the video file.

Output_path = 'C:\out\My folder';

videoFWriter = vision.VideoFileWriter(fullfile(Output_path,'myFile.avi'), ...
                         'FrameRate', videoFReader.info.VideoFrameRate);