PyAudio recorder script IOError: [Errno Input overflowed] -9981 - python-2.7

Question

The code below is what I use to record audio until the "Enter" key is pressed it returns an exception,
import pyaudio
import wave
import curses
from time import gmtime, strftime
import sys, select, os
# Name of sub-directory where WAVE files are placed
current_experiment_path = os.path.dirname(os.path.realpath(__file__))
subdir_recording = '/recording/'
# print current_experiment_path + subdir_recording
# Variables for Pyaudio
chunk = 1024
format = pyaudio.paInt16
channels = 2
rate = 48000
# Set variable for the labelling of the recorded WAVE file.
timestamp = strftime("%Y-%m-%d-%H:%M:%S", gmtime())
#wave_output_filename = '%s.wav' % self.get('subject_nr')
wave_output_filename = '%s.wav' % timestamp
print current_experiment_path + subdir_recording + wave_output_filename
# pyaudio recording stuff
p = pyaudio.PyAudio()
stream = p.open(format = format,
channels = channels,
rate = rate,
input = True,
frames_per_buffer = chunk)
print "* recording"
# Create an empty list for audio recording
frames = []
# Record audio until Enter is pressed
i = 0
while True:
os.system('cls' if os.name == 'nt' else 'clear')
print "Recording Audio. Press Enter to stop recording and save file in " + wave_output_filename
print i
if sys.stdin in select.select([sys.stdin], [], [], 0)[0]:
line = raw_input()
# Record data audio data
data = stream.read(chunk)
# Add the data to a buffer (a list of chunks)
frames.append(data)
break
i += 1
print("* done recording")
# Close the audio recording stream
stream.stop_stream()
stream.close()
p.terminate()
# write data to WAVE file
wf = wave.open(current_experiment_path + subdir_recording + wave_output_filename, 'wb')
wf.setnchannels(channels)
wf.setsampwidth(p.get_sample_size(format))
wf.setframerate(rate)
wf.writeframes(''.join(frames))
wf.close()
The exception produced is this
Recording Audio. Press Enter to stop recording and save file in 2015-11-20-22:15:38.wav
925
Traceback (most recent call last):
File "audio-record-timestamp.py", line 51, in <module>
data = stream.read(chunk)
File "/Library/Python/2.7/site-packages/pyaudio.py", line 605, in read
return pa.read_stream(self._stream, num_frames)
IOError: [Errno Input overflowed] -9981
What is producing the exception? I tried changing the chunk size (512,256,8192) it doesn't work. Changed the while loop condition and it didn't work.

Answer 1

I had a similar problem; there are 3 ways to solve it (that I could find)
set rate=24000
add option "exception_on_overflow=False" to the "read()" call, that is, make it "stream.read(chunk, exception_on_overflow=False)"
use callbacks
Here is, for your convenience, an example o "using callbacks"
#!/usr/bin/python
import sys, os, math, time, pyaudio
try:
import numpy
except:
numpy = None
rate=48000
chan=2
sofar=0
p = pyaudio.PyAudio()
def callback(in_data, frame_count, time_info, status):
global sofar
sofar += len(in_data)
if numpy:
f = numpy.fromstring(in_data, dtype=numpy.int16)
sys.stderr.write('length %6d sofar %6d std %4.1f \r' % \
(len(in_data), sofar, numpy.std(f)))
else:
sys.stderr.write('length %6d sofar %6d \r' % \
(len(in_data), sofar))
data = None
return (data, pyaudio.paContinue)
stream = p.open(format=pyaudio.paInt16, channels=chan, rate=rate,
input=True, stream_callback=callback)
while True:
time.sleep(1)