Trying to go through Ivan Idris' Numpy Cookbook. Chapter 2, broadcasting arrays... And I'm receiving this value error. I'm not sure if this is a problem within the scipy package, or something else.
'''
Created on 6 Jul 2014
@author: wrightm
'''
import unittest
import urllib.request
import scipy.io.wavfile
import matplotlib.pyplot
import numpy
class BroadCastingTest(unittest.TestCase):
def test(self):
response = urllib.request.urlopen('http://www.thesoundarchive.com/austinpowers/smashingbaby.wav')
print(response.info())
WAV_FILE = 'smashingbaby.wav'
filehandle = open(WAV_FILE, 'w')
filehandle.write(str(response.read()))
filehandle.close()
sample_rate, data = scipy.io.wavfile.read(WAV_FILE)
print("Data type", data.dtype, "Shape", data.shape)
matplotlib.pyplot.subplot(2, 1, 1)
matplotlib.pyplot.title("Original")
matplotlib.pyplot.plot(data)
newdata = data * 0.2
newdata = newdata.astype(numpy.uint8)
print("Data type", newdata.dtype, "Shape", newdata.shape)
scipy.io.wavfile.write("quiet.wav",
sample_rate, newdata)
matplotlib.pyplot.subplot(2, 1, 2)
matplotlib.pyplot.title("Quiet")
matplotlib.pyplot.plot(newdata)
# matplotlib.pyplot.show()
if __name__ == "__main__":
the exact code from the book (modified for urllib) raises this valueerror:
.../python3.9/site-packages/scipy/io/wavfile.py", line 510, in _read_riff_chunk
raise ValueError(f"File format {repr(str1)} not understood. Only "
ValueError: File format b"b'RI" not understood. Only 'RIFF' and 'RIFX' supported.
