pyav was blocked on av.container.InputContainer.decode() #615

File "/home/admin/miniconda/envs/python/lib/python3.6/threading.py", line 884, in _bootstrap
    self._bootstrap_inner()
  File "/home/admin/miniconda/envs/python/lib/python3.6/threading.py", line 916, in _bootstrap_inner
    self.run()
  File "/home/admin/miniconda/envs/python/lib/python3.6/threading.py", line 864, in run
    self._target(*self._args, **self._kwargs)
  File "/home/admin/miniconda/envs/python/lib/python3.6/multiprocessing/pool.py", line 119, in worker
    result = (True, func(*args, **kwds))
  File "/home/admin/miniconda/envs/python/lib/python3.6/multiprocessing/pool.py", line 47, in starmapstar
    return list(itertools.starmap(args[0], args[1]))
  File "/home/admin/miniconda/envs/python/lib/python3.6/site-packages/pyvideo/living_service.py", line 168, in getframes
    for frame in video.decode(stream):

Thread 14 (Thread 0x7f7db3fff700 (LWP 107258)):
#0  0x00007f7f473ab995 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f7f2c921ab3 in avpriv_slicethread_execute () from /home/admin/code/ffmpeg-4.2.2/libavutil.so.56
#2  0x00007f7f2b51e5a3 in ?? () from /home/admin/code/ffmpeg-4.2.2/libavcodec.so.58
#3  0x00007f7f2b35bd88 in ?? () from /home/admin/code/ffmpeg-4.2.2/libavcodec.so.58
#4  0x00007f7f2b197f8b in ?? () from /home/admin/code/ffmpeg-4.2.2/libavcodec.so.58
#5  0x00007f7f2b198c58 in avcodec_send_packet () from /home/admin/code/ffmpeg-4.2.2/libavcodec.so.58
#6  0x00007f7f31453a4d in __pyx_f_2av_5codec_7context_12CodecContext__send_packet_and_recv (__pyx_v_self=0x7f7e6503a288, __pyx_v_packet=0x7f7e65037688) at src/av/codec/context.c:5486
#7  0x00007f7f31456dca in __pyx_f_2av_5codec_7context_12CodecContext_decode (__pyx_v_self=0x7f7e6503a288, __pyx_skip_dispatch=0, __pyx_optional_args=0x7f7db3ffdae0) at src/av/codec/context.c:6821
#8  0x00007f7f2ec24fc5 in __pyx_pf_2av_6stream_6Stream_10decode (__pyx_v_self=0x7f7e6db7c708, __pyx_v_packet=0x7f7e65037688) at src/av/stream.c:4017
#9  0x00007f7f2ec24e4c in __pyx_pw_2av_6stream_6Stream_11decode (__pyx_v_self=0x7f7e6db7c708, __pyx_args=0x7f7e65151710, __pyx_kwds=0x0) at src/av/stream.c:3992
#10 0x000055d92a1d4336 in PyCFunction_Call () at /tmp/build/80754af9/python_1540319457073/work/Objects/methodobject.c:98
#11 0x00007f7f363f90f8 in __Pyx_PyObject_Call (func=0x7f7e54104168, arg=0x7f7e65151710, kw=0x0) at src/av/packet.c:5493
#12 0x00007f7f363f94f2 in __Pyx__PyObject_CallOneArg (func=0x7f7e54104168, arg=0x7f7e65037688) at src/av/packet.c:5561
#13 0x00007f7f363f9608 in __Pyx_PyObject_CallOneArg (func=0x7f7e54104168, arg=0x7f7e65037688) at src/av/packet.c:5580
#14 0x00007f7f363f30ba in __pyx_pf_2av_6packet_6Packet_8decode (__pyx_v_self=0x7f7e65037688) at src/av/packet.c:3086
#15 0x00007f7f363f2ee3 in __pyx_pw_2av_6packet_6Packet_9decode (__pyx_v_self=0x7f7e65037688, unused=0x0) at src/av/packet.c:3051
--
#31 0x000055d92a2553fb in _PyFunction_FastCall (globals=<optimized out>, nargs=1, args=<optimized out>, co=<optimized out>) at /tmp/build/80754af9/python_1540319457073/work/Python/ceval.c:4919
#32 _PyFunction_FastCallDict () at /tmp/build/80754af9/python_1540319457073/work/Python/ceval.c:5021
#33 0x000055d92a1d179f in _PyObject_FastCallDict () at /tmp/build/80754af9/python_1540319457073/work/Objects/abstract.c:2310
#34 0x000055d92a1d6303 in _PyObject_Call_Prepend () at /tmp/build/80754af9/python_1540319457073/work/Objects/abstract.c:2373
#35 0x000055d92a1d11de in PyObject_Call () at /tmp/build/80754af9/python_1540319457073/work/Objects/abstract.c:2261
#36 0x000055d92a2d10a6 in t_bootstrap () at /tmp/build/80754af9/python_1540319457073/work/Modules/_threadmodule.c:998
#37 0x00007f7f473a7e25 in start_thread () from /lib64/libpthread.so.0
#38 0x00007f7f470d1bad in clone () from /lib64/libc.so.6