Frameset tests sporadically fail

[nschlia]

One of frameset tests (test_frameset_bmp, test_frameset_jpg, test_frameset_png) occasionally fails. Next build it succeeds, or another fails. Seems to be a thread synchonisation/timing problem.

Example:

FAIL: test_frameset_bmp

Log has some explanation:

2022-01-05 20:30:45 ERROR : [srcdir/frame_test_pal.mp4] Reading image frame no. 4: (11) Resource temporarily unavailable
The error code EAGAIN (Resource temporarily unavailable) is returned when a frame is not returned within 30 seconds. Quite unlikely...

[nschlia]

These are actually two problems:

• Sometimes the next frame image is requested, and the logic schedules a search for it. But if this happens while the very last frame image is processed, the request goes astray. It would be processed before the next image is accessed, bit there is none and the transcoder process exits.
• The transcoder has already finished and is in the process of closing the transcoder thread down. The request is not even scheduled.

In both cases, the read action waits until time out, no image is returned.

[nschlia]

Problem still comes up:

$ ./test_frameset_bmp
Checking number of files is 250
Number of files OK
Checking access with full name
>> Checking 000204.bmp
'/tmp/tmp.KQRERvDGfk/frame_test_pal.mp4/000204.bmp' -> '/dev/null'
>> Checking 000004.bmp
'/tmp/tmp.KQRERvDGfk/frame_test_pal.mp4/000004.bmp' -> '/dev/null'
cp: error reading '/tmp/tmp.KQRERvDGfk/frame_test_pal.mp4/000004.bmp': Connection timed out
Return code: 1

[nschlia]

Looks good after the last change.

[nschlia]

Several new builds, did not happen any more, seems to be fixed!

[nschlia]

FAIL: test_frameset_bmp

Still happening...

[nschlia]

It hasn't appeared since May. Oh how I hate these kinds of bugs. Is it now fixed or is it not?!?

[nschlia]

Closed. May be re-opened if happening again.

[nschlia]

Still happens