Getting segfault when device starts #5

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1. xialuoke4062 commented on Jun 15, 2021

   

   xialuoke4062

   on Jun 15, 2021

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   Hi, I have encountered the same problem and have not been able to single out the cause. Any advice will be greatly appreciated!

   macOS Big Sur Version 11.4
   python 3.7
2. paul-shuvo commented on Jun 16, 2021

   

   paul-shuvo

   on Jun 16, 2021

   Last edited by paul-shuvo

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   @xialuoke4062 as it says in the error the queue is full. You can probably increase the queue size. You can find the following piece of code in freenect2/__init__.py in line 93.

   class QueueFrameListener(object):
       def __init__(self, maxsize=16):
           self.queue = Queue(maxsize=maxsize)
       def __call__(self, frame_type, frame):
           self.queue.put_nowait((frame_type, frame))
       def get(self, timeout=False):
           return self.queue.get(True, timeout)

   Change the maxsize. For my case, I just saved the last 6/12/18 frames, so that if my program is slow, it doesn't crash.
3. xialuoke4062 commented on Jun 16, 2021

   

   xialuoke4062

   on Jun 16, 2021

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   @paul-shuvo Thank you so much for the advice! Changing the maxsize definitely helps a bit. However, my program is indeed slow and I want to do some real-time analysis on the live stream (increasing maxsize isn't sufficient enough). When you said

   For my case, I just saved the last 6/12/18 frames

   how did you manage to achieve that inside the live-stream for loop
   for type_, frame in device:
   Thank you for your help in advance!
4. paul-shuvo commented on Jun 16, 2021

   

   paul-shuvo

   on Jun 16, 2021

   Last edited by paul-shuvo

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   From what I remember, I did something of the following:

   class QueueFrameListener(object):
       def __init__(self, maxsize=16):
           self.queue = Queue(maxsize=maxsize)
       def __call__(self, frame_type, frame):
           # you can also check is the queue is full using .full method
           if self.queue.qsize() >= 12: # change the number of frames you want to use 
               # basically remove an item to accomodate the newer frames
               _ = self.get() # or, self.queue.get(True, timeout)
           self.queue.put_nowait((frame_type, frame))
       def get(self, timeout=False):
           return self.queue.get(True, timeout)

   Let me know if it solves your problem.

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5. xialuoke4062 commented on Jun 16, 2021

   

   xialuoke4062

   on Jun 16, 2021

   Last edited by xialuoke4062

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   Works like a charm and that makes perfect sense! Can't say thank you enough - I really appreciate your help!

   👍React with 👍1Reacted by Shuvo Kumar Paul
6. chris-castillo

   added a commit that references this issue on May 4, 2022

   add the 2 open PRs, also add queue size management from rjw57#5

   1a326c4