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.

[dcnieho]

Hmm, as said on Windows i have this issue where opening a video in my code may hard-crash matlab, but SimpleMovieDemo always works file. Turns out that the problem is that i call Priority after opening a window. Calling it before fixes it (SimpleMovieDemo doesn't use it at all).
See f19f62b, which works around this.
With current master, do you still get your crash? Or did this happen to be somehow the same issue?