Simple script to record sound from the microphone, dependencies: easy_install pyaudio

sound_recorder.py

import pyaudio
import wave
 
FORMAT = pyaudio.paInt16
CHANNELS = 2
RATE = 44100
CHUNK = 1024
RECORD_SECONDS = 5
WAVE_OUTPUT_FILENAME = "file.wav"
 
audio = pyaudio.PyAudio()
 
# start Recording
stream = audio.open(format=FORMAT, channels=CHANNELS,
                rate=RATE, input=True,
                frames_per_buffer=CHUNK)
print "recording..."
frames = []
 
for i in range(0, int(RATE / CHUNK * RECORD_SECONDS)):
    data = stream.read(CHUNK)
    frames.append(data)
print "finished recording"
 
 
# stop Recording
stream.stop_stream()
stream.close()
audio.terminate()
 
waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()

Hi, I got this error when I tried to record audio

Traceback (most recent call last):
  File "listen.py", line 23, in <module>
    data = stream.read(CHUNKSIZE)
  File "/.../python/venv/lib/python3.5/site-packages/pyaudio.py", line 608, in read
    return pa.read_stream(self._stream, num_frames, exception_on_overflow)
OSError: [Errno -9981] Input overflowed

Why it is happening?
How can I fix that?

same here, did you find the fix ?

I had same issue on RPi3b+ and fixed it with picking up input device:

stream = self.audio.open(format=FORMAT, input_device_index = 2,
                                 channels=CHANNELS,
                                 rate=RATE,
                                 input=True,
                                 frames_per_buffer=CHUNK)

waveFile = wave.open(WAVE_OUTPUT_FILENAME, 'wb')
waveFile.setnchannels(CHANNELS)
waveFile.setsampwidth(audio.get_sample_size(FORMAT))
waveFile.setframerate(RATE)
waveFile.writeframes(b''.join(frames))
waveFile.close()

in this code this part can not execute
file is created but output is not come

Output is:
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2495:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:867:(find_matching_chmap) Found no matching channel map
recording...
finished recording

My code executes however the file is empty when I try to open it after the program runs

I had this same problem on Mac. Some new privacy settings block application access to the microphone by default. I had to specifically enable access to Terminal, where I was running this script.

https://support.apple.com/en-us/HT209175

You will notice that the open() on line 14 does not have a device index parameter, so how does it know what device to use? In my case the answer is via PulseAudio settings, and probably those with Jack likewise. My microphones are combined with a webcam or a headset. ALSA sees them as sub-devices. PyAudio doesn't recognise sub-devices and always uses sub-device #0, which doesn't read from the microphone, it reads from the webcam and gets nothing.

Good Day Mabdrabo, thank you for share your code. I want to ask you if you know how can I plot & hear what you have recorded with your code?

Thanks again for sharing
I don't know if this has been answered or not but anyways:
Yes, LatinAmericanProgramer you cant certainly plot it, sample code is shown below:
But before running it make sure to install librosa,numpy and matplotlib.pyplot.
import librosa as lb
import matplotlib.pyplot as plt
import numpy as np
a = r"C:\USers\Salil Saxena\Desktop\file.wav"
audio,freq = lb.load(a)
time = np.arange(0,len(audio))/freq
plt.plot(time,audio)
plt.savefig("file_name.png") //this is used to save the current plot at os.getcwd()
plt.show()
You can also save the plot by just running this simple line:

Works on Win 10, Visual Studio 2019, Anaconda, Python 3.7.x

Needed to make following changes:

print("recording...")
print("finished recording")

Using CHANNELS = 2

Gave error in:
Line 16 frames_per_buffer=CHUNK

Error:

Exception Unhandled [Errno -9998] Invalid number of channels

Changed to CHANNELS = 1

Then it works.

I have received the "Segmentation fault (core dumped)" error while running the program. How I can solve this problem.

Thanks in advance.

this code records both system audio and microphone audio...what if I only want to record the system audio/output.

Hi, thanks for the code, I cant get the output file on the same folder where the script is, can you please tell me how do i get it

I'm facing the same problem can you please tell me where the file will be saved?

Hi,

I am having a following error when I run the file with Python3.

Traceback (most recent call last):
File "sound_recorder.py", line 16, in
frames_per_buffer=CHUNK)
File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 750, in open
stream = Stream(self, *args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 441, in init
self._stream = pa.open(**arguments)
OSError: [Errno -9998] Invalid number of channels

Any suggestions?
Thank you.

Hi,

I am having a following error when I run the file with Python3.

Traceback (most recent call last):
File "sound_recorder.py", line 16, in
frames_per_buffer=CHUNK)
File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 750, in open
stream = Stream(self, *args, **kwargs)
File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 441, in init
self._stream = pa.open(**arguments)
OSError: [Errno -9998] Invalid number of channels

Any suggestions?
Thank you.

send the entire code in order to help you

I think I had the same error msg, change number of channels. If you define 2 make it 1 or the other way round. This is from memory. Op do 16 apr. 2020 17:32 schreef KEVIN <[email protected]>:

…

***@***.**** commented on this gist. ------------------------------ Hi, I am having a following error when I run the file with Python3. Traceback (most recent call last): File "sound_recorder.py", line 16, in frames_per_buffer=CHUNK) File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 750, in open stream = Stream(self, *args, **kwargs) File "/usr/local/lib/python3.7/site-packages/pyaudio.py", line 441, in *init* self._stream = pa.open(**arguments) OSError: [Errno -9998] Invalid number of channels Any suggestions? Thank you. send the entire code in order to help you — You are receiving this because you commented. Reply to this email directly, view it on GitHub <https://gist.github.com/8678538#gistcomment-3257090>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC5HCZREDDV2JER332KKBLTRM4QILANCNFSM4H3JH4UQ> .

Traceback (most recent call last):
File "a.py", line 16, in
frames_per_buffer=CHUNK)
File "/usr/lib/python2.7/site-packages/pyaudio.py", line 750, in open
stream = Stream(self, *args, **kwargs)
File "/usr/lib/python2.7/site-packages/pyaudio.py", line 441, in init
self._stream = pa.open(**arguments)
IOError: [Errno -9996] Invalid input device (no default output devicce)

archlinux on termux,python2.7. struggle by this for a long time. how to solve it ?

How do you read this file after writing?

ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2642:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
ALSA lib pcm_route.c:869:(find_matching_chmap) Found no matching channel map
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
JackShmReadWritePtr::~JackShmReadWritePtr - Init not done for -1, skipping unlock
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pcm_oss.c:377:(_snd_pcm_oss_open) Unknown field port
ALSA lib pulse.c:242:(pulse_connect) PulseAudio: Unable to connect: Connection refused

ALSA lib pulse.c:242:(pulse_connect) PulseAudio: Unable to connect: Connection refused

ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
ALSA lib pcm_usb_stream.c:486:(_snd_pcm_usb_stream_open) Invalid type for card
python3.6: src/hostapi/alsa/pa_linux_alsa.c:3636: PaAlsaStreamComponent_BeginPolling: Assertion `ret == self->nfds' failed.
Aborted (core dumped)


I may not have the easy_install. Is that the problem?

Thanks in advance,
Chris Pappas

Hi, it just worked like a charm. :) I am new to sound features. If I want to record a wave file as described below:

Each utterance is stored as a one-second (or less)
WAVE format file, with the sample data encoded as
linear 16-bit single-channel PCM values, at a 16 KHz
rate.

Should I change the Constants like:

FORMAT = pyaudio.paInt16
CHANNELS = 1
RATE = 16000
CHUNK = 1024
RECORD_SECONDS = 1
WAVE_OUTPUT_FILENAME = "file.wav"

how should I reflect the 16-bit?

Thank yo for yo code, ma man (or woman).

Sorry but the code won't work

Sorry but the code won't work

What's the error?

Sorry but the code won't work

I think I know the problem, you may have a python3 interpreter while this code is written in python2. You need to delete the spaces after any print and turn it into print(...)

Hi, I got this error when I tried to record audio

Traceback (most recent call last):
  File "listen.py", line 23, in <module>
    data = stream.read(CHUNKSIZE)
  File "/.../python/venv/lib/python3.5/site-packages/pyaudio.py", line 608, in read
    return pa.read_stream(self._stream, num_frames, exception_on_overflow)
OSError: [Errno -9981] Input overflowed

Why it is happening?
How can I fix that?

same here, did you find the fix ?

I had same issue on RPi3b+ and fixed it with picking up input device:

stream = self.audio.open(format=FORMAT, input_device_index = 2,
                                 channels=CHANNELS,
                                 rate=RATE,
                                 input=True,    # Save the recorded data in a .wav format

                             frames_per_buffer=CHUNK)

I achieved a much better stability by setting CHUNK to an integer fraction of RATE, e.g. CHUNK = int(RATE/10), otherwise still had same exception mostly already in 10s to 80s after starting the loop with stream.read(chunk). And anyway for such data sources it is a good approach to use "try" and be ready for exceptions and know how much gets lost:)

Hi,thanks good

How can I add timestamp on the recorded audio?

I mean like putting current time on each frame in opencv:
cv2.putText(frame, str(datetime.now()), (20, 40), font, 2, (255, 255, 255), 2, cv2.LINE_AA)

You can use pydub module for this i think.
For example

from pydub import AudioSegment
...
...
...
    data = stream.read(CHUNK)
    slice = AudioSegment(data, sample_width=???, frame_rate=???, channels=???)
    slice_len = len(slice) #slice_len is the duration of data frame in milliseconds

hey all, i know this is too old a gist, but i came here from nvidia forum. Any help is appreciated.

This script is assuming i physically have the jetson right and using its microphone? because i'm connected to it via ssh on my macbook & physically very far. So, i guess I somehow need to send the audio packets/bytes to it?

and does pyaudio help with that? anyone has clues how to proceed? thanks :)

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