Negative timestamps

[lukaszog]

I'm using pyuvc on RPI3 and I discovered problem with timestamps. The problem is in line:
out_frame.timestamp = uvc_frame.capture_time.tv_sec + <double>uvc_frame.capture_time.tv_usec * 1e-6

Some times tv_sec and tv_usec together returns negative values. After a few minutes, they return positive values.

Example:

-950305
-2
-4980
-1
-918961
-1
-971470
-1
-887617
-1
-937959
-1
-856273
-1
-904449
-1
-824929
-1
-870939
-1
-793585
-1
-837428
-1
-762241
-1
-803918
-1
-730897
-1
-770407
-1
-699553
-1
-736897
-1
-668209
-1
-703386
-1
-636865
-1
-669876
-1
-605521
-1
-636366
-1
-574177
-1
-602855
-1
-542833
-1
-511489
-1
-569345
-1
-480145
-1
-535834
-1
-448801
-1
-502324
-1
-417457
-1
-468814
-1
-386114
-1
-435303
-1
-354770
-1
-401793
-1
-323426
-1
-368282
-1
-292082
-1
-334772
-1
-260738
-1
-301261
-1
-229394
-1
-267751
-1
-198050
-1
-234241
-1
-166706
-1
-200730
-1
-135362
-1
-167220
-1
-104018
-1
-133709
-1
-72674
-1
-100199
-1
-41330
-1
-66688
-1
-9986
0
-978642
-1
-33178
0
-947298
0
-999668
0
-915954
0
-966157
0
-884610
0
-932647
0
-853266
0
-899136
0
-821922
0
-865626
0
-790578
0
-832115
0
-759234
0
-798605
0
-727890
0
-765095
0
-696546
0
-731584
0
-665202
0
-698074
0
-633859
0
-664563
0
-602515
0
-631053
0
-571171
0
-539827
0
-597542
0
-508483
0
-564032
0
-477139
0
-530522
0
-445795
0
-497011
0
-414451
0
-463501
0
-383107
0
-429990
0
-351763
0
-396480
0
-320419
0
-362970
0
-289075
0
-329459
0
-257731
0
-295949
0
-225752
0
-262438
0
-194408
0
-228928
0
-163064
0
-195417
0
-131720
0
-161907
0
-100376
0
-128397
0
-69032
0
-94886
0
-37688
0
-6344
0
-61376
0
25000
0
-27865
0
56344
0
5645
0
87688
0
39156
0
119032
0
72666
0
150376
0
106176
0
181720
0
139687
0
213064
0
173197
0
244408
0
206708
0
275752
0
240218
0
307096
0
273729
0
338440
0
307239
0
369784
0
340749
0
401128
0
432472
0
374260
0
463816
0
407770
0
495160
0
441281
0
526504
0
474791
0
557848
0
508302
0
589192
0
541812
0
620536
0
575322
0
651880
0
608833
0
683224
0
642343
0
714568
0
675854
0
745912
0
709364
0
777256
0
742875
0
808600
0
776385
0
839943
0
809895
0
871287
0
843406
0
902631
0
876916
0
933975
0
965319
0
910427
0
996663
0
943937
1
28007
0
977447
1
59351
1
10958
1
90695
1
44468
1
122039
1
77979
1
153383
1
111489
1
184727
1
145000
1
216071
1
178510
1
247415
1
212020
1
278759
1
245531
1
310103
1
279041
1
341447
1
312552
1
372791
1
404135
1
346062
1
435479
1
379573
1
466823
1
413083
1
498167
1
446593
1
529511
1
480104
1
560855
1
513614
1
592199
1
547125
1
623543
1
580635
1
654887
1
614146
1
686231
1
647656
1
717575
1
681166
1
748919
1
714677
1
780263
1
748187
1
811607
1
781698
1
842951
1
815208
1
874295
1
848719
1
905639
1
936983
1
882229
1
968327
1
915739
1
999671
1
949250
2
31015
1
982760
2
62359
2
16271
2
93703
2
49781
2
125046
2
83291
2
156390
2
116802
2
187734
2
150312
2
219078
2
183823
2
250422
2
217333
2
281766
2
250844
2
313110
2
284354
2
344454
2
317864
2
375798
2
407142
2

It's possible to fix this?