Hello!
I am having difficulties with a script that is supposed to display videos for my studies’ subjects.
I am using Matlab2021b and have both gstreamer-1.0-devel-msvc-x86_64-1.22.4 and gstreamer-1.0-msvc-x86_64-1.22.4 installed, with custom settings where all features are included.
I have the latest version of psychtoolbox downloaded and installed, as far as I know, since I ran the download script today. It went through perfectly, except for the following:
"Trying to trigger an update of the fontconfig cache if that should prove neccessary.
This may take a couple of seconds, or sometimes even minutes. Please be patient...
Warning: Something went wrong with high-quality
text renderer setup. Read 'help DrawTextPlugin'
for troubleshooting.
> In PsychtoolboxPostInstallRoutine (line 735)
In SetupPsychtoolbox (line 337)
Press Return key to continue."
I doubt that this is the sole problem but I could be wrong, of course.
The code used to work, so I’m confused. We did have to update GStreamer, so maybe that was problematic.
I saved all the output from matlab to a text file since matlab seems to freeze and must be forced to close when this script is run. The only PTB output that is received is:
PTB-INFO: Multi-display setup in explicit multi-display mode detected. Using the following mapping:
PTB-INFO: Screen 0 corresponds to the full Windows desktop area. Useful for stereo presentations in stereomode=4 ...
PTB-INFO: Screen 1 corresponds to the display area of the monitor with the Windows-internal name \\.\DISPLAY1 ...
PTB-INFO: Screen 2 corresponds to the display area of the monitor with the Windows-internal name \\.\DISPLAY2 ...
PTB-INFO: Your version of Matlab 64-Bit is global system DPI aware. On Windows-8 or later, fullscreen onscreen windows will only work
PTB-INFO: properly timing-wise when displayed on displays with the same pixel density as your systems primary display monitor.
PTB-INFO: For your multi-display setup the stimulus display monitor must have a DPI of (96, 96), matching that of
PTB-INFO: your primary display monitor. Ideally you will only display on the primary display in the first place.
PTB-INFO: Displaying on anything with a different DPI will cause mysterious visual timing problems, sync failures etc.
PTB-INFO: Read 'help RetinaDisplay' for more info on this topic.
PTB-INFO: This is Psychtoolbox-3 for Microsoft Windows, under Matlab 64-Bit (Version 3.0.19 - Build date: Feb 20 2023).
PTB-INFO: OS support status: Windows 10 (Version 10.0) supported and tested to some limited degree.
PTB-INFO: Type 'PsychtoolboxVersion' for more detailed version information.
PTB-INFO: Most parts of the Psychtoolbox distribution are licensed to you under terms of the MIT License, with
PTB-INFO: some restrictions. See file 'License.txt' in the Psychtoolbox root folder for the exact licensing conditions.
PTB-INFO: For information about paid support, support memberships and other commercial services, please type
PTB-INFO: 'PsychPaidSupportAndServices'.
PTB-INFO: The detected endline of the vertical blank interval is equal or lower than the startline. This indicates
PTB-INFO: that i couldn't detect the duration of the vertical blank interval and won't be able to correct timestamps
PTB-INFO: for it. This will introduce a very small and constant offset (typically << 1 msec). Read 'help BeampositionQueries'
PTB-INFO: for how to correct this, should you really require that last few microseconds of precision.
PTB-INFO: Btw. this can also mean that your systems beamposition queries are slightly broken. It may help timing precision to
PTB-INFO: enable the beamposition workaround, as explained in 'help ConserveVRAMSettings', section 'kPsychUseBeampositionQueryWorkaround'.
PTB-INFO: OpenGL-Renderer is NVIDIA Corporation :: NVIDIA GeForce RTX 2080 Ti/PCIe/SSE2 :: 4.6.0 NVIDIA 531.79
PTB-INFO: VBL startline = 600 , VBL Endline = 599
PTB-INFO: Measured monitor refresh interval from beamposition = 16.579788 ms [60.314403 Hz].
PTB-INFO: Will use beamposition query for accurate Flip time stamping.
PTB-INFO: Measured monitor refresh interval from VBLsync = 16.586600 ms [60.289631 Hz]. (50 valid samples taken, stddev=0.158238 ms.)
PTB-INFO: Reported monitor refresh interval from operating system = 16.666667 ms [60.000000 Hz].
PTB-INFO: Small deviations between reported values are normal and no reason to worry.
PTB-INFO: Stereo for free fusion or dual-display desktop spanning enabled (2-in-1 stereo).
PTB-INFO: ==============================================================================================================================
PTB-INFO: WINDOWS DWM DESKTOP COMPOSITOR IS ACTIVE. On this Windows-10 or later system, Psychtoolbox can no longer reliably detect if
PTB-INFO: this will cause trouble for timing and integrity of visual stimuli or not. You might be just fine, or you could be in trouble.
PTB-INFO: Use external measurement equipment and independent procedures to verify reliability of timing if you care about proper timing.
PTB-INFO: ==============================================================================================================================
PTB-INFO: Your script requests use of a stereoscopic display mode (stereomode = 4).
PTB-INFO: Stereoscopic stimulus display is usually more flexible, convenient and robust if
PTB-INFO: the Psychtoolbox imaging pipeline is enabled. Your graphics card is capable
PTB-INFO: of using the pipeline but your script doesn't enable use of the pipeline.
PTB-INFO: I recommend you enable use of the pipeline for enhanced stereo stimulus display.
PTB-INFO: Have a look at the demoscript ImagingStereoDemo.m on how to do this.
I wonder if there is any advice that you can provide?
The matlab function used to run the movies is:
function Show_movie(moviename,eye) % eye is where movie is being presented
white = [255 255 255];
gray = [128 128 128];
black = [0 0 0];
red= [255 0 0];
blue=[0 0 255];
fixRadius_inner = 0.15;
white_line_size = 2; % width of line in the middle of fixation spot
AssertOpenGL;
Screen('Preference', 'SkipSyncTests', 1);
% Wait until user releases keys on keyboard:
KbReleaseWait;
KbName('UnifyKeyNames');
% Setup key mapping:
space=KbName('Space');
shift=KbName('RightShift');
% Parameter Set-Up
screen = min(Screen('Screens'));
% Stereo - mode is 4
[win, windowrect] = Screen(screen, 'OpenWindow', gray, [], [], [], 4); % Limit screen to just a window in the top left screen corner.
HideCursor
% calculate dimentions of the screen
x0 = windowrect(1);
y0 = windowrect(2);
xEnd = windowrect(3);
yEnd = windowrect(4);
screenWidth = (xEnd-x0);
screenHeight= (yEnd-y0);
[centerX, centerY] = RectCenter(windowrect);
FOV =30
PixelperDegree = 800/FOV;
size_radius_degree=0.25; %% this is something we might need to change
Radius = round(size_radius_degree*PixelperDegree)
fixRadius_inner = round(PixelperDegree * fixRadius_inner);
fixRect = CenterRectOnPointd([0 0 Radius*2 Radius*2],centerX,centerY);
fixRect_inner=CenterRectOnPointd([0 0 fixRadius_inner*2 fixRadius_inner*2],centerX,centerY);
Priority(MaxPriority(win));
%% Wait Screen --> The experiment will start shortly
Screen('SelectStereoDrawBuffer', win, eye);
Screen('FillRect', win,black);
Screen('TextSize',win,20);
Screen('SelectStereoDrawBuffer', win, double(~eye));
Screen('FillRect', win,black);
Screen('TextSize',win,20);
textMessage = 'The experiment will start shortly';
textRect = Screen(win, 'TextBounds', textMessage);
textWidth = textRect(3) - textRect(1);
textHeight = textRect(4) - textRect(2);
% First eye
Screen('SelectStereoDrawBuffer', win, eye);
Screen('DrawText', win, textMessage,...
centerX-(textWidth/2), centerY-(textHeight/2), white, black);
% Second eye
Screen('SelectStereoDrawBuffer', win, double(~eye));
Screen('DrawText', win, textMessage,...
centerX-(textWidth/2), centerY-(textHeight/2), white, black);
% Flip info to the real window
Screen('Flip', win);
%% keyboard cheking
%Let matlab command window ignore incoming keypresses
KbName('UnifyKeyNames');
psychtoolbox_forp_id=0;
%% start after a t has been pressed
try
% Open movie file:
Screen('SelectStereoDrawBuffer', win, eye);
[movie,movieduration,fps,w,h,count] = Screen('OpenMovie', win, moviename);
Screen('SelectStereoDrawBuffer', win, eye);
% Start playback engine:
Screen('PlayMovie', movie, 1);
% Playback loop: Runs until end of movie or keypress:
keysOfInterest=zeros(1,256);
keysOfInterest(KbName('t'))=1;
% only look for t as trigger
KbQueueCreate(psychtoolbox_forp_id, keysOfInterest);
KbQueueStart;
[keyPress, keyTime, keyID] = KbCheck(-1);
oldKeyID = keyID;
KbQueueWait
while 1
%%%% PAUSE CODE %%%%%%%
[keyIsDown,secs,keyCode]=KbCheck;
if (keyIsDown==1 && keyCode(space))
% Stop playback:
Priority(0);
Screen('PlayMovie', movie, 0);
% Close movie:
Screen('CloseMovie', movie);
% Close Screen, we're done:
sca;
end
% Wait for next movie frame, retrieve texture handle to it
Screen('SelectStereoDrawBuffer', win, eye);
tex = Screen('GetMovieImage', win, movie);
% Valid texture returned? A negative value means end of movie reached:
if tex<=0
% We're done, break out of loop:
break;
end
% Draw the new texture immediately to screen:
Screen('SelectStereoDrawBuffer', win, eye);
Screen('DrawTexture', win, tex);
Screen('SelectStereoDrawBuffer', win, eye);
Screen('FillOval', win, blue, fixRect);
Screen('FillOval', win, red, fixRect_inner);
Screen('DrawLine', win, white, fixRect(1), centerY,fixRect(3), centerY, white_line_size);
Screen('DrawLine', win, white, centerX, fixRect(2),centerX, fixRect(4), white_line_size);
% Update display:
Screen('Flip', win);
% Release texture:
Screen('Close', tex);
end
% Stop playback:
Priority(0);
Screen('PlayMovie', movie, 0);
% Close movie:
Screen('CloseMovie', movie);
% Close Screen, we're done:
sca;
ShowCursor
catch %#ok<CTCH>
Priority(0);
sca;
ShowCursor
psychrethrow(psychlasterror);
end
