Long recordings distort from 6h47m on - sounds like gargling

Audacity Help Forum Windows
1

I record long radio events and at around 6h45m47.835 the sound begins to distort - like a gargling sound, not conventional clipping distortion.

But if I make two recodings of 6h each and copy them to one 12h file, the result is perfect!

Audacity 2.1.2, but also happens on older versions.
I tried on Windows 10, 8.1 and 7

2

Audacity is a 32 bit program. I seem to remember this is the limit it can address, depending on number of channels, bit depth and sample rate. Perhaps you could try lowering on of these factors?

I’m sure one of the people who know will chime in.

EDIT: according to the FAQ, I’m wrong:

http://manual.audacityteam.org/man/faq_recording_how_to_s.html#remaining

Audacity is only limited by disk space. Do you have enough free disk space?

3

That would be the 32-bit limit for track storage at 88200 Hz but as Cyrano says, that limit no longer applies to current Audacity.

Is your project rate 88200 Hz (bottom left)?

Is it a physical radio or internet radio?

Can you post a WAV file of a few seconds at the transition where the gargling starts? And please attach the saved file from Help > Audio Device Info… (click OK).

Please see here for how to attach files: https://forum.audacityteam.org/t/how-to-attach-files-to-forum-posts/24026/1


Gale

4

My project rate is 44100.

Yes, it is internet radio, recording direct from the audio driver.

But the gargling is only heard on the recording, not during listening. And it happens on all 3 of my PCs.

Here is the transision, in the attached file.

5

Sorry, that was a .wav file.
I think the project file will be more useful to you.
I have saved the extract and zipped it up. Here it is.
gargle.zip (968 KB)

6

And here, finally, the Audio Device Info.
I just realized I have 2.1.1, not 2.1.2

==============================
Default recording device number: 1
Default playback device number: 3
==============================
Device ID: 0
Device name: Microsoft Sound Mapper - Input
Host name: MME
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
==============================
Device ID: 1
Device name: Stereo Mix (Realtek High Defini
Host name: MME
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
==============================
Device ID: 2
Device name: Microsoft Sound Mapper - Output
Host name: MME
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
    352800
    384000
==============================
Device ID: 3
Device name: Speakers (Realtek High Definiti
Host name: MME
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
    352800
    384000
==============================
Device ID: 4
Device name: Primary Sound Capture Driver
Host name: Windows DirectSound
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.120000
Low Playback Latency: 0.000000
High Recording Latency: 0.240000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 5
Device name: Stereo Mix (Realtek High Definition Audio)
Host name: Windows DirectSound
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.120000
Low Playback Latency: 0.000000
High Recording Latency: 0.240000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 6
Device name: Primary Sound Driver
Host name: Windows DirectSound
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.120000
High Recording Latency: 0.000000
High Playback Latency: 0.240000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
==============================
Device ID: 7
Device name: Speakers (Realtek High Definition Audio)
Host name: Windows DirectSound
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.120000
High Recording Latency: 0.000000
High Playback Latency: 0.240000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
==============================
Device ID: 8
Device name: Speakers (Realtek High Definition Audio)
Host name: Windows WASAPI
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.003000
High Recording Latency: 0.000000
High Playback Latency: 0.010000
Supported Rates:
    48000
==============================
Device ID: 9
Device name: Speakers (Realtek High Definition Audio) (loopback)
Host name: Windows WASAPI
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.003000
Low Playback Latency: 0.000000
High Recording Latency: 0.010000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 10
Device name: Stereo Mix (Realtek High Definition Audio)
Host name: Windows WASAPI
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.003000
Low Playback Latency: 0.000000
High Recording Latency: 0.010000
High Playback Latency: 0.000000
Supported Rates:
==============================
Selected recording device: 4 - Primary Sound Capture Driver
Selected playback device: 8 - Speakers (Realtek High Definition Audio)
Supported Rates:
    48000
==============================
Available mixers:
==============================
Available recording sources:
0 - Master
==============================
Available playback volumes:
0 - PCM
==============================
Recording volume is native
Playback volume is native==============================
Default recording device number: 1
Default playback device number: 3
==============================
Device ID: 0
Device name: Microsoft Sound Mapper - Input
Host name: MME
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
==============================
Device ID: 1
Device name: Stereo Mix (Realtek High Defini
Host name: MME
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
==============================
Device ID: 2
Device name: Microsoft Sound Mapper - Output
Host name: MME
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
    352800
    384000
==============================
Device ID: 3
Device name: Speakers (Realtek High Definiti
Host name: MME
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.090000
Low Playback Latency: 0.090000
High Recording Latency: 0.180000
High Playback Latency: 0.180000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
    352800
    384000
==============================
Device ID: 4
Device name: Primary Sound Capture Driver
Host name: Windows DirectSound
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.120000
Low Playback Latency: 0.000000
High Recording Latency: 0.240000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 5
Device name: Stereo Mix (Realtek High Definition Audio)
Host name: Windows DirectSound
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.120000
Low Playback Latency: 0.000000
High Recording Latency: 0.240000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 6
Device name: Primary Sound Driver
Host name: Windows DirectSound
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.120000
High Recording Latency: 0.000000
High Playback Latency: 0.240000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
==============================
Device ID: 7
Device name: Speakers (Realtek High Definition Audio)
Host name: Windows DirectSound
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.120000
High Recording Latency: 0.000000
High Playback Latency: 0.240000
Supported Rates:
    8000
    9600
    11025
    12000
    15000
    16000
    22050
    24000
    32000
    44100
    48000
    88200
    96000
    176400
    192000
==============================
Device ID: 8
Device name: Speakers (Realtek High Definition Audio)
Host name: Windows WASAPI
Recording channels: 0
Playback channels: 2
Low Recording Latency: 0.000000
Low Playback Latency: 0.003000
High Recording Latency: 0.000000
High Playback Latency: 0.010000
Supported Rates:
    48000
==============================
Device ID: 9
Device name: Speakers (Realtek High Definition Audio) (loopback)
Host name: Windows WASAPI
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.003000
Low Playback Latency: 0.000000
High Recording Latency: 0.010000
High Playback Latency: 0.000000
Supported Rates:
==============================
Device ID: 10
Device name: Stereo Mix (Realtek High Definition Audio)
Host name: Windows WASAPI
Recording channels: 2
Playback channels: 0
Low Recording Latency: 0.003000
Low Playback Latency: 0.000000
High Recording Latency: 0.010000
High Playback Latency: 0.000000
Supported Rates:
==============================
Selected recording device: 4 - Primary Sound Capture Driver
Selected playback device: 8 - Speakers (Realtek High Definition Audio)
Supported Rates:
    48000
==============================
Available mixers:
==============================
Available recording sources:
0 - Master
==============================
Available playback volumes:
0 - PCM
==============================
Recording volume is native
Playback volume is native
7

You could try 2.1.2 - http://audacityteam.org/download/windows. It has a new version of the PortAudio Audio I/O library we use.

You could also try recording in Audacity with Windows WASAPI loopback instead of stereo mix.

As an experiment you could see if Windows Sound Recorder has the same problem. You already have Stereo Mix as default Windows recording device, so Sound Recorder would record from Stereo Mix automatically.


Gale