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Details

Type: Bug
Resolution: Fixed
Priority: P2: Important
Fix Version/s: 6.2.8, 6.4.3, 6.5.0, 6.6.0
Affects Version/s: 6.3.2, 6.4, 6.5
Component/s: Multimedia
Labels:
None
Environment:

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System Version: macOS 12.6.1 (21G217)
Kernel Version: Darwin 21.6.0
Boot Volume: Macintosh HD
Model Name: Mac mini
Model Identifier: Macmini7,1
Processor Name: Dual-Core Intel Core i7

Web Camera: Logitech HD Webcam C270

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System Version: macOS 12.6.1 (21G217) Kernel Version: Darwin 21.6.0 Boot Volume: Macintosh HD Model Name: Mac mini Model Identifier: Macmini7,1 Processor Name: Dual-Core Intel Core i7 Web Camera: Logitech HD Webcam C270

Platform/s:

macOS
Commits:
a40b9fed5 (dev), b0332afbf (6.5), b442e7159 (6.4), a84280c74 (tqtc/lts-6.2)

Description

QMediaRecorder frequently returns unknown errors when trying to record on Mac

I have a simple project (based on Qt examples) that uses the Qt Multimedia module to record audio from a microphone:

audiorecorder.cpp:

#include "audiorecorder.h"
#include "ui_audiorecorder.h"

#include <QAudioInput>
#include <QMediaDevices>

AudioRecorder::AudioRecorder()
    : ui(new Ui::AudioRecorder)
    , audioRecorder(new QMediaRecorder)
    , audioDevice(QMediaDevices::defaultAudioInput())
{
    qDebug() << audioDevice.description();

    ui->setupUi(this);

    captureSession.setRecorder(audioRecorder);

// If you set input and device here, then no errors occur
//    captureSession.setAudioInput(new QAudioInput(this));
//    captureSession.audioInput()->setDevice(audioDevice);

    connect(audioRecorder, &QMediaRecorder::recorderStateChanged, this,
            [this] (QMediaRecorder::RecorderState state) {
        qDebug() << "QMediaRecorder::recorderStateChanged()" << state;

        switch (state) {
        case QMediaRecorder::RecordingState:
            ui->pushRecord->setChecked(true);
            break;
        case QMediaRecorder::PausedState:
            break;
        case QMediaRecorder::StoppedState:
            ui->pushRecord->setChecked(false);

            captureSession.setAudioInput({});

            break;
        }

    });

    connect(audioRecorder, &QMediaRecorder::errorOccurred, this,
            [this](QMediaRecorder::Error error, const QString &errorString) {
        qDebug() << "QMediaRecorder::errorOccurred()" << error << errorString;
    });
}

void AudioRecorder::on_pushRecord_clicked() {
    if (ui->pushRecord->isChecked()) {
        captureSession.setAudioInput(new QAudioInput(this));
        captureSession.audioInput()->setDevice(audioDevice);
        audioRecorder->record();
    } else {
        audioRecorder->stop();
    }
}

The whole project is in the attached archive.

If I run the project with a connected webcam and start recording several times and then stop it, I get the following output with errors:

"Unknown USB Audio Device"
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (1768846202)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState

If I run the project without a connected webcam and start recording several times and then stop it, I get the following output with errors:

"ZoomAudioDevice"
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (-12737)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (-12737)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (-12737)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::errorOccurred() QMediaRecorder::FormatError "An unknown error occurred (-12737)"
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState
QMediaRecorder::recorderStateChanged() QMediaRecorder::RecordingState
QMediaRecorder::recorderStateChanged() QMediaRecorder::StoppedState

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AudioRecordTestSimple.zip
6 kB
01 Feb '23 12:34

Issue Links

relates to

QTBUG-106885 On Ubuntu 22.04 the microphone device is captured before recording starts

Closed

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For Gerrit Dashboard: QTBUG-110844
#	Subject	Branch	Project	Status	CR	V
460405,6	AVFMediaEncoder: Set channel layout configuration when recording	dev	qt/qtmultimedia	Status: MERGED	+2	0
460589,2	AVFMediaEncoder: Set channel layout configuration when recording	6.4	qt/qtmultimedia	Status: MERGED	+2	0
460590,2	AVFMediaEncoder: Set channel layout configuration when recording	6.5	qt/qtmultimedia	Status: MERGED	+2	0
460593,5	AVFMediaEncoder: Set channel count from audio device when recording	tqtc/lts-6.2	qt/tqtc-qtmultimedia	Status: MERGED	+2	0