PsychToolboxVideoPlayer

YuZhi

Hi Josh,

I made visual stimuli from Psychtoolbox and would like to run it from Bpod. the stimuli had shorter duration if I ran it using PsychToolboxVideoPlayer.
could you please advise how I can modify the script to play the stimulus in the same way as from Psychtoolbox?
thanks.

load ('current_display.mat') %% .mat file is attached here
current_display = double(current_display)/255;
V = PsychToolboxVideoPlayer(0, [1920 1080], [0 0], [180 180], 0); 
V.loadVideo(1, current_display); 
V.play(1); 
clear V;

Josh

Hello Yuzhi,

Can you please describe the contents of current_display.mat?

Thanks,
-Josh

YuZhi

Josh wrote[quote='Josh' pid='4505' dateline='1666379671']
Hello Yuzhi,

Can you please describe the contents of current_display.mat?

Thanks,
-Josh

Hi Josh,

It's a 1080x 1920x 3 uint8 and then I convert it to double.
I used Screen('GetImage') to convert my stimuli from Psychtoolbox, which are moving dots, into matrice in Matlab. Maybe it's just an image, not a movie format??
thanks.

Best wishes,
YuZhi.

YuZhi

Josh wrote[quote='Josh' pid='4505' dateline='1666379671']
Hello Yuzhi,

Can you please describe the contents of current_display.mat?

Thanks,
-Josh

Hi Josh,

Finally I could manage to run the stimuli with PsychToolboxVideoPlayer function. The issue was that the screen was flashing between frames though the dots were moving. any modifications I can make to remove the flashes? I cannot attach the moviedots.mat file here (I am not sure why) which I used to run from bpod so that you can advise me better. thanks in advance.

load ('moviedots.mat')
Screen('Preference', 'SkipSyncTests', 0);
V = PsychToolboxVideoPlayer(0, [1920 1080], [0 0], [0 0], 0);
for i = 1:60
current_display = double(moviedots(i).cdata);
V.loadVideo(1, current_display); 
V.play(1); 
end
clear V;

Josh

Hello Yuzhi,

Can you please send the .mat file to support@sanworks.io?
I'll try to replicate the issue here.

Thanks,
Josh