Posts: 4
Threads: 1
Joined: Sep 2019
Hey All,
I'm getting this error "Segmentation fault" and i'm guessing i'm trying to access something that doesnt exist but i can't find what. When i run this script on windows it doesnt give the error but does on ubuntu. Any ideas?
Code:
#
# 15/09/2019 Commented out cv2 and imshow
#
#
import numpy as np
import cv2
import sys
from openalpr import Alpr
import requests
import datetime
HA_ENDPOINT = 'http://192.168.1.68:8123/api/services/script/turn_on'
PLATES = ['TY19XVH']
RTSP_SOURCE = 'rtsp://192.168.0.60/mpeg4'
WINDOW_NAME = 'openalpr'
FRAME_SKIP = 10
def open_cam_rtsp(uri):
return cv2.VideoCapture(uri)
def main():
alpr = Alpr('gb', '/srv/openalpr/openalpr.conf', '/srv/openalpr/runtime_data')
if not alpr.is_loaded():
print('Error loading OpenALPR')
sys.exit(1)
alpr.set_top_n(3)
#alpr.set_default_region('new')
cap = open_cam_rtsp(RTSP_SOURCE)
if not cap.isOpened():
alpr.unload()
sys.exit('Failed to open video file!')
#cv2.namedWindow(WINDOW_NAME, cv2.WINDOW_AUTOSIZE)
#cv2.setWindowTitle(WINDOW_NAME, 'OpenALPR video test')
_frame_number = 0
#declare a stamp 10 minutes ago, initialise variable when script starts
STAMP = datetime.datetime.now() - datetime.timedelta(minutes=10)
while True:
ret_val, frame = cap.read()
if not ret_val:
print('VidepCapture.read() failed. Exiting...')
break
_frame_number += 1
if _frame_number % FRAME_SKIP != 0:
continue
#cv2.imshow(WINDOW_NAME, frame)
ret, enc = cv2.imencode("*.jpg", frame)
results = alpr.recognize_array(enc.tobytes())
#results = alpr.recognize_array(frame)
for i, plate in enumerate(results['results']):
best_candidate = plate['candidates'][0]
print('Plate #{}: {:7s} ({:.2f}%)'.format(i, best_candidate['plate'].upper(), best_candidate['confidence']))
#Does the plate match known plates
if best_candidate['plate'].upper() in PLATES:
#Has the gate fired recently? If not in the last 10 minutes then allow to fire again
if datetime.datetime.now() > STAMP:
print("Recognised")
#If a plate is recongised set a timestamp to prevent it firing lots of times until time has expired
print(datetime.datetime.now())
#Open the gate
response = requests.post(
HA_ENDPOINT,
headers={'Content-Type': 'application/json', 'x-ha-access': 'w1ll1ams!' },
data='{"entity_id": "script.ANPR"}',
)
STAMP = STAMP = datetime.datetime.now() + datetime.timedelta(minutes=2)
else:
print("Not firing as time has not exceeded")
if cv2.waitKey(1) == 27:
break
cv2.destroyAllWindows()
cap.release()
alpr.unload()
if __name__ == "__main__":
main()
Posts: 4
Threads: 1
Joined: Sep 2019
I'll add that the script runs fine, until a car number plate appears, it seems to take two readings and then fails with segmentation fault.
Posts: 12,137
Threads: 496
Joined: Sep 2016
Please show exact error traceback verbatim.
It contains valuable information, like where failing.
Posts: 4
Threads: 1
Joined: Sep 2019
Sep-17-2019, 07:43 PM
(This post was last modified: Sep-17-2019, 07:48 PM by samtwilliams.)
Hi Larz60 sorry i'm not familiar with python so i'm hoping this is right;
Output: Starting program: /usr/bin/python3 readstream.py
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[New Thread 0x7ffff444d700 (LWP 129)]
[Thread 0x7ffff444d700 (LWP 129) exited]
[New Thread 0x7ffff444d700 (LWP 132)]
[New Thread 0x7fffc7382700 (LWP 133)]
Thread 1 "python3" received signal SIGSEGV, Segmentation fault.
0x00007fffe37f5568 in tesseract::LTRResultIterator::WordFontAttributes(bool*, bool*, bool*, bool*, bool*, bool*, int*, int*) const ()
from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
(gdb) backtrace
#0 0x00007fffe37f5568 in tesseract::LTRResultIterator::WordFontAttributes(bool*, bool*, bool*, bool*, bool*, bool*, int*, int*) const ()
from /usr/lib/x86_64-linux-gnu/libtesseract.so.4
#1 0x00007fffe40615e2 in alpr::TesseractOcr::recognize_line(int, alpr::PipelineData*) () from /usr/lib/libopenalpr.so.2
#2 0x00007fffe4062f91 in alpr::OCR::performOCR(alpr::PipelineData*) () from /usr/lib/libopenalpr.so.2
#3 0x00007fffe402591a in alpr::AlprImpl::analyzeSingleCountry(cv::Mat, cv::Mat, std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >) ()
from /usr/lib/libopenalpr.so.2
#4 0x00007fffe40243e0 in alpr::AlprImpl::recognizeFullDetails(cv::Mat, std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >) ()
from /usr/lib/libopenalpr.so.2
#5 0x00007fffe4026dd7 in alpr::AlprImpl::recognize(cv::Mat, std::vector<cv::Rect_<int>, std::allocator<cv::Rect_<int> > >) () from /usr/lib/libopenalpr.so.2
#6 0x00007fffe4026cbc in alpr::AlprImpl::recognize(cv::Mat) () from /usr/lib/libopenalpr.so.2
#7 0x00007fffe40263ef in alpr::AlprImpl::recognize(std::vector<char, std::allocator<char> >) () from /usr/lib/libopenalpr.so.2
#8 0x00007fffe401ea6c in alpr::Alpr::recognize(std::vector<char, std::allocator<char> >) () from /usr/lib/libopenalpr.so.2
#9 0x00007fffe437719f in recognizeArray () from /usr/lib/libopenalprpy.so
#10 0x00007ffff1402dae in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#11 0x00007ffff140271f in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#12 0x00007ffff16165d4 in _ctypes_callproc () from /usr/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so
#13 0x00007ffff1616d64 in ?? () from /usr/lib/python3.6/lib-dynload/_ctypes.cpython-36m-x86_64-linux-gnu.so
#14 0x00000000005a95fc in _PyObject_FastCallKeywords ()
#15 0x0000000000509ad3 in ?? ()
#16 0x000000000050b4a9 in _PyEval_EvalFrameDefault ()
#17 0x0000000000508c69 in ?? ()
#18 0x000000000050999d in ?? ()
#19 0x000000000050b4a9 in _PyEval_EvalFrameDefault ()
#20 0x0000000000508c69 in ?? ()
#21 0x000000000050999d in ?? ()
#22 0x000000000050b4a9 in _PyEval_EvalFrameDefault ()
#23 0x0000000000507125 in ?? ()
#24 0x000000000050a3b3 in PyEval_EvalCode ()
#25 0x00000000006349e2 in ?? ()
#26 0x0000000000634a97 in PyRun_FileExFlags ()
#27 0x000000000063824f in PyRun_SimpleFileExFlags ()
#28 0x0000000000638df1 in Py_Main ()
#29 0x00000000004b0de0 in main ()
(gdb)
I have also added a fault handler and the output is this;
Output: # python3 -Xfaulthandler readstream.py
Plate #0: 0909E (81.66%)
Plate #0: 0909E (81.66%)
Fatal Python error: Segmentation fault
Current thread 0x00007f3ad58e1740 (most recent call first):
File "/usr/local/lib/python3.6/dist-packages/openalpr/openalpr.py", line 174 in recognize_array
File "readstream.py", line 54 in main
File "readstream.py", line 89 in <module>
Segmentation fault
Not quite sure what the issue is though, it's always seem to process two plates before faulting.
Posts: 1
Threads: 0
Joined: Sep 2019
Looks like its failing on the following command...
results = alpr.recognize_array(enc.tobytes())
is it worth checking what is returned by cv2.imencode on line 53...
enc = cv2.imencode("*.jpg", frame)
Posts: 4
Threads: 1
Joined: Sep 2019
Sep-17-2019, 08:18 PM
(This post was last modified: Sep-17-2019, 08:18 PM by samtwilliams.)
didn't really expose much, I removed that line and went with ndarray;
#cv2.imshow(WINDOW_NAME, frame)
#ret, enc = cv2.imencode("*.jpg", frame)
results = alpr.recognize_ndarray(frame)
print(results)this is the output
Output: root@a6d9d4883914:/anpr# python3 readstream.py
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751373946, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 109.541199, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751374089, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 124.764801, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751374244, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 80.463402, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751374989, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 84.739304, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751375821, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 68.119301, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751376661, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 91.671898, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751377485, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 86.435303, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751378316, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 74.5457, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751379148, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 85.642502, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751379980, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 76.310799, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751380813, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 95.191399, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751381644, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 109.487602, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751382476, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 105.507004, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751383305, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 108.853699, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751384140, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 118.1707, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751384973, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 106.439697, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751385804, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 79.0336, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
{'version': 2, 'data_type': 'alpr_results', 'epoch_time': 1568751386636, 'img_width': 1280, 'img_height': 720, 'processing_time_ms': 105.540497, 'regions_of_interest': [{'x': 0, 'y': 0, 'width': 1280, 'height': 720}], 'results': []}
Fatal Python error: Segmentation fault
Current thread 0x00007f76c0bcc740 (most recent call first):
File "/usr/local/lib/python3.6/dist-packages/openalpr/openalpr.py", line 192 in recognize_ndarray
File "readstream.py", line 54 in main
File "readstream.py", line 88 in <module>
Segmentation fault
Posts: 12,137
Threads: 496
Joined: Sep 2016
I've been out all day, and just getting around to answering posts.
you are correct as to line 54 being the last statement executed.
I can't say what actually caused the error, and this may be a difficult one to find.
I have seen this type of error in 'C' code when a pointer was corrupted, and registers got mucked up a result.
perhaps send the link of this thread to the author [email protected] and ask for his thoughts.
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