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ZoomIt: Fix silent recording audio on multichannel audio endpoints #49400

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ZoomIt: Fix silent recording audio on multichannel audio endpoints #49400

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6754411
ZoomIt - Fix silent recording audio on multichannel audio endpoints
Jul 18, 2026
227ce95
ZoomIt - Align labels and even row spacing on the Record options tab
Jul 18, 2026
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32 changes: 32 additions & 0 deletions src/modules/ZoomIt/ZoomIt/AudioSampleGenerator.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -78,6 +78,38 @@ winrt::IAsyncAction AudioSampleGenerator::InitializeAsync()
}
m_audioGraph = audioGraphResult.Graph();

// The default graph format follows the audio engine's processing format
// for the default render device, which can be multichannel (e.g. 7.1
// when spatial sound is enabled). Feeding more than two channels into
// the AAC encoding profile produces a multichannel HE-AAC track that
// most decoders, including the Media Foundation AAC decoder (max 5.1),
// cannot play, so recordings sound silent. Re-create the graph with an
// explicit stereo format at the device sample rate.
if (m_audioGraph.EncodingProperties().ChannelCount() > 2)
{
auto defaultProps = m_audioGraph.EncodingProperties();
auto stereoProps = winrt::AudioEncodingProperties();
stereoProps.Subtype(defaultProps.Subtype());
stereoProps.SampleRate(defaultProps.SampleRate());
stereoProps.BitsPerSample(defaultProps.BitsPerSample());
stereoProps.ChannelCount(2);
stereoProps.Bitrate(defaultProps.SampleRate() * 2 * defaultProps.BitsPerSample());

auto stereoSettings = winrt::AudioGraphSettings(winrt::AudioRenderCategory::Media);
stereoSettings.EncodingProperties(stereoProps);
auto stereoResult = co_await winrt::AudioGraph::CreateAsync(stereoSettings);
if (stereoResult.Status() == winrt::AudioGraphCreationStatus::Success)
{
m_audioGraph.Close();
m_audioGraph = stereoResult.Graph();
OutputDebugStringA("AudioGraph re-created with stereo format\n");
}
else
{
OutputDebugStringA("WARNING: Failed to re-create AudioGraph with stereo format, keeping default\n");
}
}

// Get AudioGraph encoding properties for resampling
auto graphProps = m_audioGraph.EncodingProperties();
m_graphSampleRate = graphProps.SampleRate();
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34 changes: 17 additions & 17 deletions src/modules/ZoomIt/ZoomIt/ZoomIt.rc
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Expand Up @@ -122,7 +122,7 @@ BEGIN
DEFPUSHBUTTON "OK",IDOK,184,308,50,14
PUSHBUTTON "Cancel",IDCANCEL,241,308,50,14
LTEXT "ZoomIt v12.11",IDC_VERSION,42,7,73,10
LTEXT "Copyright � 2006-2026 Mark Russinovich",IDC_COPYRIGHT,42,17,251,8
LTEXT "Copyright � 2006-2026 Mark Russinovich",IDC_COPYRIGHT,42,17,251,8
CONTROL "<a HREF=""https://www.sysinternals.com"">Sysinternals - www.sysinternals.com</a>",IDC_LINK,
"SysLink",WS_TABSTOP,42,26,150,9
ICON "APPICON",IDC_STATIC,12,9,20,20
Expand Down Expand Up @@ -266,26 +266,26 @@ STYLE DS_SETFONT | DS_FIXEDSYS | DS_CONTROL | WS_CHILD | WS_SYSMENU
FONT 8, "MS Shell Dlg", 400, 0, 0x1
BEGIN
CONTROL "",IDC_RECORD_HOTKEY,"msctls_hotkey32",WS_BORDER | WS_TABSTOP,65,72,80,12
RTEXT "Record Toggle:",IDC_STATIC,7,74,54,8
LTEXT "Record Toggle:",IDC_STATIC,7,74,54,8
LTEXT "Record video of the unzoomed live screen or a static zoomed session by entering the recording hot key and finish the recording by entering it again. ",IDC_STATIC,7,7,266,18
RTEXT "Scaling:",IDC_STATIC,36,92,26,8
COMBOBOX IDC_RECORD_SCALING,65,91,26,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | CBS_SORT | WS_VSCROLL | WS_TABSTOP
CONTROL "16:9:",IDC_RECORD_ASPECT_RATIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | WS_TABSTOP,94,92,30,10
RTEXT "Format:",IDC_STATIC,36,110,26,8
COMBOBOX IDC_RECORD_FORMAT,65,109,60,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | WS_VSCROLL | WS_TABSTOP
LTEXT "Frame Rate:",IDC_STATIC,134,92,44,8,NOT WS_VISIBLE
COMBOBOX IDC_RECORD_FRAME_RATE,177,91,42,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | CBS_SORT | NOT WS_VISIBLE | WS_VSCROLL | WS_TABSTOP
RTEXT "Scaling:",IDC_STATIC,36,90,26,8
COMBOBOX IDC_RECORD_SCALING,65,89,26,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | CBS_SORT | WS_VSCROLL | WS_TABSTOP
CONTROL "16:9:",IDC_RECORD_ASPECT_RATIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | WS_TABSTOP,94,90,30,10
RTEXT "Format:",IDC_STATIC,36,106,26,8
COMBOBOX IDC_RECORD_FORMAT,65,105,60,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | WS_VSCROLL | WS_TABSTOP
LTEXT "Frame Rate:",IDC_STATIC,134,90,44,8,NOT WS_VISIBLE
COMBOBOX IDC_RECORD_FRAME_RATE,177,89,42,30,CBS_DROPDOWNLIST | CBS_AUTOHSCROLL | CBS_OEMCONVERT | CBS_SORT | NOT WS_VISIBLE | WS_VSCROLL | WS_TABSTOP
LTEXT "To crop the portion of the screen that will be recorded, enter the hotkey with the Shift key in the opposite mode. ",IDC_STATIC,7,29,258,18
LTEXT "To record a specific window, enter the hotkey with the Alt key in the opposite mode.",IDC_STATIC,7,51,266,19
CONTROL "Capture &system audio:",IDC_CAPTURE_SYSTEM_AUDIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,7,128,90,10
CONTROL "&Capture audio input:",IDC_CAPTURE_AUDIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,11,146,86,10
CONTROL "Mono:",IDC_MIC_MONO_MIX,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,108,160,48,10
COMBOBOX IDC_MICROPHONE,68,175,205,30,CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP
LTEXT "Microphone:",IDC_MICROPHONE_LABEL,25,176,42,8
CONTROL "&Noise cancellation:",IDC_NOISE_CANCELLATION,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,25,160,72,10
CONTROL "Capture &system audio:",IDC_CAPTURE_SYSTEM_AUDIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_LEFT | WS_TABSTOP,7,122,90,10
CONTROL "&Capture audio input:",IDC_CAPTURE_AUDIO,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_LEFT | WS_TABSTOP,7,138,90,10
CONTROL "Mono:",IDC_MIC_MONO_MIX,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,108,154,48,10
COMBOBOX IDC_MICROPHONE,68,169,205,30,CBS_DROPDOWNLIST | WS_VSCROLL | WS_TABSTOP
LTEXT "Microphone:",IDC_MICROPHONE_LABEL,25,170,42,8
CONTROL "&Noise cancellation:",IDC_NOISE_CANCELLATION,"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | BS_RIGHT | WS_TABSTOP,25,154,72,10
CONTROL "Show &webcam overlay (Ctrl+C toggles)",IDC_WEBCAM_OVERLAY,
"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | WS_TABSTOP,7,194,148,10
PUSHBUTTON "Webcam S&ettings...",IDC_WEBCAM_SETTINGS,177,193,68,14
"Button",BS_AUTOCHECKBOX | BS_LEFTTEXT | WS_TABSTOP,7,186,148,10
PUSHBUTTON "Webcam S&ettings...",IDC_WEBCAM_SETTINGS,177,185,68,14
PUSHBUTTON "&Trim",IDC_TRIM_FILE,220,213,53,14
END

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