Crash Advanced Calibration: Invalid moviehandle

[iandol]

Using readmeAdvancedCalibration_nonhuman_primate.m

Every so often (after another crash) I get:

Error in function OpenMovie: 	Usage error
Invalid moviehandle provided. No movie associated with this handle !!!

...

Error using Screen
Usage:

[ moviePtr [duration] [fps] [width] [height] [count] [aspectRatio] [hdrStaticMetaData]]=Screen('OpenMovie', windowPtr, moviefile [, async=0] [, preloadSecs=1] [,
specialFlags1=0][, pixelFormat=4][, maxNumberThreads=-1][, movieOptions]);

Error in VideoPlayer/openNextVid (line 197)
                [vpnt,vdur] = Screen('OpenMovie', obj.wpnt, char(obj.videos(id)), 0, 1, 2);
                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Error in VideoPlayer/start (line 75)
                [obj.playingVid, obj.playingVidDur, obj.vidIndex] = obj.openNextVid(false);
                                                                    ^^^^^^^^^^^^^^^^^^^^^^
Error in readmeAdvancedCalibration_nonhuman_primate (line 187)
    vp.start();

Some cleanup state after a crash causes this. I don't quite understand it as OpenMovie doesn't accept moviehandles but filenames? If you run readmeAdvancedCalibration_nonhuman_primate.m again then no crash.

[dcnieho]

Hi Ian, strange. Could you add a disp(char(obj.videos(id))) right in front of line 197 so we can see what comes by there?
Do i understand correctly that this happens on the first run of readmeAdvancedCalibration_nonhuman_primate.m after it crashed for some other reason?

[iandol]

Right bug #98 helps to trigger this one reliably. Spitting out both wpnt and obj.videos(id)

disp('DEBUG: ')
disp(obj.wpnt)
disp(char(obj.videos(id)))

On first run without crash:

DEBUG: 
    10

/home/cog/Videos/0001-0250R.mp4

On second run after the tick crash:

DEBUG: 
    10

/home/cog/Videos/0001-0250E.mp4
Error in function OpenMovie: 	Usage error
Invalid moviehandle provided. No movie associated with this handle !!!

The windowpointer 10 is valid and the file exists.

I suspect this is a PTB problem somewhere. Your original script uses clear all and if I do that after the tick crash (but before run again) I get a full MATLAB crash:

>> clear all
Error in function PlayMovie: 	Usage error
Invalid moviehandle provided. No movie associated with this handle !!!

Abnormal termination:
Segmentation violation

Current Thread: 'PTB mainthread' id 133642514859584

A clear all shouldn't crash matlab (2024b, Ubuntu 22.04)...

[iandol]

I tried to repro the crash using SimpleMovieDemo then a clear all but that doesn't cause any issues.

[dcnieho]

I can't repro with #98 crash or any crash. I do have another issue with my code that sometimes it just crashes (matlab!) off the bat when trying to load the first video. I need to run SimpleMovieDemo first once, and then my code works reliably. I have not been able to figure this out. But i am apparently doing something that gets something in a weird state. I'll try to dig (may/will take a while!) what the exact order of calls is that causes this behavior.