atlantis414

## README.md

      
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                atlantis414
                / README.md
            
            
              Created
              September 7, 2017 07:33
                — forked from datagrok/README.md
            
              
                Circular imports in Python 2 and Python 3: when are they fatal? When do they work?
              
          
    When are Python circular imports fatal?

In your Python package, you have:

an __init__.py that designates this as a Python package
a module_a.py, containing a function action_a() that references an attribute (like a function or variable) in module_b.py, and
a module_b.py, containing a function action_b() that references an attribute (like a function or variable) in module_a.py.

This situation can introduce a circular import error: module_a attempts to import module_b, but can't, because module_b needs to import module_a, which is in the process of being interpreted.
But, sometimes Python is magic, and code that looks like it should cause this circular import error works just fine!

  
## rtsp-rtp-sample.py
"""
http://stackoverflow.com/questions/28022432/receiving-rtp-packets-after-rtsp-setup
A demo python code that ..

1) Connects to an IP cam with RTSP
2) Draws RTP/NAL/H264 packets from the camera
3) Writes them to a file that can be read with any stock video player (say, mplayer, vlc & other ffmpeg based video-players)

Done for educative/demonstrative purposes, not for efficiency..!

## audio_format.py
"""Helper functions for working with audio files in NumPy."""
"""some code borrowed from https://github.com/mgeier/python-audio/blob/master/audio-files/utility.py"""

import numpy as np
import contextlib
import librosa
import struct
import soundfile

def float_to_byte(sig):
	"""
	http://stackoverflow.com/questions/28022432/receiving-rtp-packets-after-rtsp-setup
	A demo python code that ..

	1) Connects to an IP cam with RTSP
	2) Draws RTP/NAL/H264 packets from the camera
	3) Writes them to a file that can be read with any stock video player (say, mplayer, vlc & other ffmpeg based video-players)

	Done for educative/demonstrative purposes, not for efficiency..!
	"""Helper functions for working with audio files in NumPy."""
	"""some code borrowed from https://github.com/mgeier/python-audio/blob/master/audio-files/utility.py"""

	import numpy as np
	import contextlib
	import librosa
	import struct
	import soundfile

	def float_to_byte(sig):