I'm developing the desktop application to record .mp4 video format from USB camera using Capture Engine sample code. My application is crashing while recording the MJPG video format onWindows 8 32bit OS.
I have modified the capture engine sample code as per my requirement and completed the development. My application is working fine in the following OSes: Window 10 64bit, Window 8.1 32/64bit and Windows 8 64bit.
The USB camera supports two video formats: UYVY and MJPG. The Access violation occurs only when the camera has MJPG and UYVY format. To verify the crash issue, I tried different cameras which have above formats and
able to recreate the issue.
Then, I tried the camera which supports YUY2 and MJPG format and my application are able to record a video in the two formats without any crash.
Also, I updated the PC and tried it but unfortunately, the issue still persists.
The issue is occurring after initializing the preview and retrieving the current media type usingGetCurrentDeviceMediaType(). Below code snippet is used to configure for video recording.
HRESULT RecordVideo(TCHAR *tzDestinationFile)
{
HRESULT hr = E_FAIL;
IMFCaptureSink *pCaptureSink = NULL;
IMFCaptureRecordSink *pRecordSink = NULL;
IMFCaptureSource *pCaptureSource = NULL;
IMFMediaSource *pMediaSource = NULL;
IMFPresentationDescriptor *pPD = NULL;
IMFMediaType* pSrcMediaType = NULL;
if((m_pCaptureEngine == NULL) || (m_pCaptureEngineCB == NULL)) { return MF_E_NOT_INITIALIZED; }
hr = m_pCaptureEngine->GetSink(MF_CAPTURE_ENGINE_SINK_TYPE_RECORD, &pCaptureSink); if (FAILED(hr)){ goto done; }
hr = pCaptureSink->QueryInterface(IID_PPV_ARGS(&pRecordSink)); if (FAILED(hr)){ goto done; }
hr = m_pCaptureEngine->GetSource(&pCaptureSource); if (FAILED(hr)){ goto done; }
// Clear any existing streams from previous recordings.
hr = pRecordSink->RemoveAllStreams(); if (FAILED(hr)){ goto done; }
hr = pRecordSink->SetOutputFileName(tzDestinationFile); if (FAILED(hr)){ goto done; }
hr = ConfigureVideoEncoding(pCaptureSource, pRecordSink, MFVideoFormat_H264); if (FAILED(hr)){ goto done; }
hr = m_pCaptureEngine->StartRecord(); if (FAILED(hr)){ goto done; }
m_bRecording = true;
done:
SafeRelease(&pCaptureSource);
SafeRelease(&pRecordSink);
SafeRelease(&pPD);
SafeRelease(&pMediaSource);
return hr;
}
HRESULT ConfigureVideoEncoding(IMFCaptureSource *pCaptureSource, IMFCaptureRecordSink *pRecordSink, REFGUID guidEncodingType)
{
IMFMediaType *pMediaType = NULL;
IMFMediaType *pH264MediaType = NULL;
GUID guidSubType = GUID_NULL;
if((pCaptureSource == NULL) || (pRecordSink == NULL) || (guidEncodingType == GUID_NULL))
return E_FAIL;
// Configure the video format for the recording sink.
HRESULT hr = pCaptureSource->GetCurrentDeviceMediaType((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_RECORD , &pMediaType); if (FAILED(hr)){ goto done; }
if(pMediaType == NULL)
return E_FAIL;
hr = ConfigureH264EncoderMediaType(pMediaType, guidEncodingType, &pH264MediaType); if (FAILED(hr)){ goto done; }
// Connect the video stream to the recording sink.
DWORD dwSinkStreamIndex = 0;
hr = pRecordSink->AddStream((DWORD)MF_CAPTURE_ENGINE_PREFERRED_SOURCE_STREAM_FOR_VIDEO_RECORD, pH264MediaType, NULL, &dwSinkStreamIndex); if (FAILED(hr)){ goto done; }
done:
SafeRelease(&pMediaType);
SafeRelease(&pH264MediaType);
return hr;
}In addition to that, I'm posting the access violation exception and my PC configuration here. I hope this will be helpful to find the root cause.
Exception:
First-chance exception at 0x75151A65 in .exe: Microsoft C++ exception: _com_error at memory location 0x0312F538.
First-chance exception at 0x75151A65 in .exe: Microsoft C++ exception: _com_error at memory location 0x0312F538.
..........OnCaptureEvent MF_CAPTURE_ENGINE_PREVIEW_STARTED
First-chance exception at 0x53D9FF4C (mfreadwrite.dll) in .exe: 0xC0000005: Access violation reading location 0x00000000.
Unhandled exception at 0x53D9FF4C (mfreadwrite.dll) in .exe: 0xC0000005: Access violation reading location 0x00000000.
DxDiag:
------------------
System Information
------------------
Time of this report: 5/9/2018, 18:17:57
Machine name: WindowsTeam
Operating System: Windows 8 Pro 32-bit (6.2, Build 9200) (9200.win8_gdr.151112-0600)
Language: English (Regional Setting: English)
System Manufacturer: Dell Inc.
System Model: Vostro 3900
BIOS: BIOS Date: 03/03/15 15:17:01 Ver: 04.06.05
Processor: Intel(R) Core(TM) i5-4460 CPU @ 3.20GHz (4 CPUs), ~3.2GHz
Memory: 4096MB RAM
Available OS Memory: 3502MB RAM
Page File: 1139MB used, 3003MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled
DxDiag Version: 6.02.9200.16384 32bit UnicodeI investigated in many ways but I could not get any clue to solve this issue. I was stick with the issue for past one week.
May I know why this issue is occurring only on Windows 8 32bit?
Let me know if you require any other information from my end.
Thanks in advance.