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Webcam grab: SharedReadOnly mode, VideoPreview/VideoRecord source fallback, name the blocking app in the error (NVIDIA Broadcast finding)

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This commit is contained in:
Llama Chile Shop
2026-08-06 14:42:54 -07:00
parent 98cdc4b3f4
commit b64830ed11
2 changed files with 23 additions and 7 deletions
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Services/MediaCaptureFrameSource.cs
+11 -4
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@@ -43,14 +43,21 @@ public sealed class MediaCaptureFrameSource : ICameraFrameSource
VideoDeviceId = _deviceId,
StreamingCaptureMode = StreamingCaptureMode.Video,
MemoryPreference = MediaCaptureMemoryPreference.Cpu,
SharingMode = MediaCaptureSharingMode.SharedReadOnly,
};
await capture.InitializeAsync(settings);
var colorSource = capture.FrameSources
.FirstOrDefault(pair => pair.Value.Info.MediaStreamType == MediaStreamType.VideoPreview)
.Value;
var colorSource = capture.FrameSources.Values
.OrderBy(s => s.Info.MediaStreamType == MediaStreamType.VideoPreview ? 0 : 1)
.FirstOrDefault(s => s.Info.MediaStreamType is MediaStreamType.VideoPreview or MediaStreamType.VideoRecord);
if (colorSource == null)
throw new InvalidOperationException($"No video preview source on camera '{_deviceId}'.");
{
var kinds = string.Join(", ", capture.FrameSources.Values
.Select(s => s.Info.MediaStreamType).Distinct());
throw new InvalidOperationException(
$"Camera '{_deviceId}' exposes no video source (found: {kinds}). " +
"It may be locked by another app (e.g. NVIDIA Broadcast).");
}
reader = await capture.CreateFrameReaderAsync(colorSource, MediaEncodingSubtypes.Bgra8);
reader.FrameArrived += OnFrameArrived;