Tag: Windows API

Reference Signal Source: audio as Media Foundation source

Posted on July 15, 2017July 13, 2017 by Roman

Reference signal source for DirectShow in its video part already received Media Foundation Source interface earlier. This time, the update implements a separate Media Foundation source for audio. MfGenerate2 sample code gives an idea on how to initialize the source: using namespace AlaxInfoDirectShowReferenceSource; CComPtr<IAudioMediaSource> pSource; __C(pSource.CoCreateInstance(__uuidof(AudioMediaSource))); __C(pSource->SetMediaType(NULL, g_nSampleRate, g_nChannelCount, g_nBitDepth)); __C(pSource->put_Duration((DOUBLE) g_nDuration)); CComPtr<IMFMediaSource> pAudioMediaSource =…

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IMFAttributes::CopyAllItems freeze on copying to self

Posted on July 11, 2017July 11, 2017 by Roman

An attempt to copy Media Foundation attribute collection to itself results in a deadlock. Well, it’s not a good idea and a practical one to do a nonsense like this, but the implementation should be resistant to such use either, esp. avoiding the unexpected deadlock. #include “stdafx.h” #include <mfapi.h> #pragma comment(lib, “mfplat.lib”) #pragma comment(lib, “mfuuid.lib”)…

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Media Foundation’s MFT_MESSAGE_SET_D3D_MANAGER with Frame Rate Converter DSP

Posted on May 11, 2017May 11, 2017 by Roman

It might look weird why would someone try Direct3D mode with a DSP, which is not supposed to be Direct3D aware, but still. I am omitting the part why I even got to such scenario. The documentation says a few things about MFT_MESSAGE_SET_D3D_MANAGER: This message applies only to video transforms. The client should not send…

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Intel Quick Sync Video Consumption by Applications

Posted on January 7, 2017 by Roman

I wrote a few posts on hardware H.264 encoding (e.g. this and the latest one Applying Hardsubs to H.264 Video with GPU). A blog reader asked a question regarding availability of the mentioned Intel Quick Sync Video support with low end Intel x5-Z8300 CPU. […] Intel has advertised that the Cherry Trail CPUs support H264…

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Bug in Media Foundation MPEG-4 File Source related to timestamping video frames of a fragmented MP4 file

Posted on December 4, 2016December 4, 2016 by Roman

Some recent update in Media Foundation platform introduced a new bug related to fragmented MP4 files and H.264 video. The bug shows up consistently with file versions: mfplat.dll – 10.0.14393.351 (rs1_release_inmarket.161014-1755)Â Â Â 15-Oct-16 05:48 mfmp4srcsnk.dll – 10.0.14393.351 (rs1_release_inmarket.161014-1755)Â Â Â 15-Oct-16 05:45 The nature of the problem is that MPEG-4 File Source is incorrectly time stamping the data:…

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Applicability of Virtual DirectShow Sources

Posted on September 28, 2016December 2, 2020 by Roman

Virtual DirectShowÂ sources have been a long time synonym of software-only camera implementation exposed to applications along with physical cameras in a way that applications consume the sources without making a difference whether the camera is real or virtual. Vivek’s template was a starting point for many: Capture Source Filter filter (version 0.1) 86 KB…

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KB3176938’s Frame Server update visually

Posted on September 2, 2016September 5, 2016 by Roman

M-JPEG and H.264 media types are available again (good) Nevertheless connected, H.264 video is not processed correctly; new bug or old one? Not clear. Even though it sort of works, in DirectShow it looks broken in another new way (this and not just this), perhaps a collateral damage and maybe never ever fixed… There is…

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