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Video source works in DirectShow but not MF: Error 0x80070491
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Benh
1
Reputation point
We are developing a camera. We have two resolution versions, low res 384 x 290 and medium res 640 x 481.
The low and medium versions work with DirectShow (either GraphEdt or VLC) on Win10.
The low res works with Windows Camera, but not the med res one, on playing it give the error 0x80070491 (which is error unknown)
I've built the Windows SDK SimpleCapture app to debug, but I just get a Windows event with the code 0x80070491 as before on start of playback.
I've run MFTrace on this app, but it's the same error with noting I can see as useful additional information.
The low res looks fine in SimpleCapture.
I've compared the advertise UVC properties from both low res and med res and they are identical apart from the width, height and framesize.
The video format is YUY2.
DirectShow handles both OK, and there is no difference in the resultant filter graph.
Any clues as to how to debug further? Issues to look out for?
Are odd line numbers a issue for MF?
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{count} votes
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Rita Han - MSFT 2,171 Reputation points2020-09-22T00:58:28.21+00:00 Hello @Benh , at which line of SimpleCapture you get this error?
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Benh 1 Reputation point
2020-09-22T09:00:27.203+00:00 Hi RitaHan,
This error is an event after the Play starts in OnMediaPlayerEvent()
Line 141 Preview.cppI've also tried MFCaptureD3D and the error is the same.
Thanks for engaging.
Ben -
Benh 1 Reputation point
2020-09-22T11:39:20.277+00:00 As an update, I've now used the Windows Classic Samples - CaptureEngine
This throws the same error at
OnCaptureEvent()
guidType == MF_CAPTURE_ENGINE_ERROR
Line 295 capture.cpp -
Rita Han - MSFT 2,171 Reputation points
2020-09-23T01:45:09.957+00:00 Hello @Benh , I test CaptureEngine and SimpleCapture with Microsoft LifeCam HD-3000, both work for me without reproducing this issue. Can you check if your device is working fine with your system? (Take a look at Device Manager, for example.)
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Benh 1 Reputation point
2020-09-23T08:16:02.947+00:00 Hi RitaHan, Thank you for testing the Microsoft code.
The issue is we are developing a camera and have 2 versions, one works, one doesn't in MMF. They both work in DirectShow. The medium res camera operates correctly under DirectShow (and VLC), Device Manager says it has started and no errors.
We suspect something about the UVC descriptors or the video format is crashing MMF dlls.
The MS code examples open the camera interface and read the descriptors OK. It is only on play that the DLL throws an error which is classed as UNKNOWN.The only mention I can find of this error on the web is from around 2013-15, when people experienced issues moving from Win7 to Win10 and having out of date drivers.
My installation is all fresh and up to date on Win10.Can MMF handle odd number of lines?
Does the min and max bandwidth parameter in UVC descriptors matter for raw, uncompressed video?Thanks,
Ben -
Rita Han - MSFT 2,171 Reputation points
2020-09-24T03:28:39.293+00:00 Hello @Benh , DirectShow and Media Foundation are different components, different results received may be expected. If you want to find out why it doesn't work with MF you may need to share what are done before this error occurs and which API calling cause this error, then we can do a further investigation. For UVC descriptor hardware/driver related issue you can ask a question at MSDN forum: "Windows Hardware WDK and Driver Development" for more professional support.
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Benh 1 Reputation point
2020-09-24T06:31:31.583+00:00 Thank you, I will try that other forum.
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Rita Han - MSFT 2,171 Reputation points
2020-09-28T06:40:30.527+00:00 I'll change the tag to not-supported because hardware and driver are not supported on this site currently. Thanks for your understanding.
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Benh 1 Reputation point
2020-10-02T16:21:12.797+00:00 Hi RitaHan
I got no replies in that forum. I searched for Developer forums on MMF and followed links because forums were deprecated and it led me back here, hence I posted again the same question.Where can I get technical help with MMF?
The camera works with DirectShow, it works with Linux, MMF crashes.
Thanks
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