Recording a video of 8 bars with blanks

[ahmadi123]

Dear Vistalab,
I'd like to record a video of pRF mapping stimuli but haven't been successful in forcing Psychtoolbox to do so. I have tried adding VideoRecordingDemo('pRF.avi',0, 0,1,1) at the beginning of doRetinotopyScan.m. It starts recording but fails to continue due to codec issues. Although this is a Psychtoolbox, not a Vistadisp issue, I would greatly appreciate your advice on how to record a video of bar stimuli?
Many thanks in advance and kind regards,
Ahmadi

[JWinawer]

Try this.

Note that it will take a lot of memory, though, since concatenating all the images makes for a very large array before it gets compressed into an MP4. Once saved, it is about 5 MB.

% Get PRF directory (requires Remote Data Toolbox)

erniePRF = mrtInstallSampleData('functional', 'erniePRF');

cd(erniePRF);

 

% Load  images and parameters from the pRF experiment

load('8_bars_images');

load('8_bars_params');

 

% Get frame rate

isi = median(diff(stimulus.seqtiming));

frameRate = round(1/isi);

 

% Initialize a movie

myMovie = images(:,:,stimulus.seq);

 

% Pad with singleton dimension so Matlab knows it's a gray-scale movie

%   ( x * y * 1 * n)

sz = size(myMovie);

myMovie = reshape(myMovie, sz(1),sz(2),1,sz(3));

 

% Initialize a video writer

v = VideoWriter('PRF.mp4', 'MPEG-4');

v.FrameRate = frameRate;

 

% Open it, write it, and close it

open(v);

writeVideo(v,myMovie)

close(v);

[ahmadi123]

Many thanks! It worked.