media-foundation | Repository for Windows Media Foundation related tools | Awesome List library

Using the Microsoft tutorial on Audio/Video Capture in Media Foundation, I try to create a media source for a video camera. Code below is directly taken from the aforementioned tutorial:

I'm having some problems with MPEG1 videos and Media Foundation: So Media Foundation doesn't support playback of MPEG1 video streams (see here), but for some reason it will still open them and it will even report the correct duration and frame size. So at opening time everything looks like it can play those files.

But it can't! Once you try to actually play the MPEG1 video file, IMFAsyncCallback::Invoke() will be called with a status of MESessionTopologySet and then IMFMediaEvent::GetStatus() will return 0xc004f011 and that's about it.

So is there any way to check if a video format can actually be played by Media Foundation after opening it or is there any way to make Media Foundation only open files that it can actually play? Currently I can only tell if a file can be played or not by attempting to start playback and then see if it works or not which is somewhat inconvenient. I'd like to be able to tell if a file can be played or not much earlier.

I'm trying to run this code:

I've written this program to setup an HEVC decoder based on https://docs.microsoft.com/en-us/windows/win32/medfound/supporting-direct3d-11-video-decoding-in-media-foundation. Everything works fine until the end when I call result = decoder->SetOutputType(0, media_type, 0); this returns the error MF_E_ATTRIBUTENOTFOUND. I'm not sure what's wrong, this error isn't described in the SetOutputType documentation and I've only found a couple examples of HEVC decoding with MF and none of them describe an error like this.

I am able to display a video stream from an mp4 video by writing byte samples directly to the Enhanced Video Renderer (EVR) sink (thanks to answer on Media Foundation EVR no video displaying).

I'd like to do the same thing but for a webcam source. The current problem I've got is that my webcam only support RGB24 and I420 formats and as far as I can tell the EVR only supports RGB32. In some Media Foundation scenarios I believe the conversion will happen automatically provided a CColorConvertDMO class is registered in the process. I've done that but I suspect because of the way I'm writing samples to the EVR the color conversion is not being invoked.

My question is what sort of approach should I take to allow RGB24 samples read from my webcam IMFSourceReader to allow writing to the EVR IMFStreamSink?

My full sample program is here and is unfortunately rather long due to the Media Foundation plumbing required. The block where I attempt to match the EVR sink media type to the webcam source media type is below.

The problem is the setting of the MF_MT_SUBTYPE attribute. From what I can tell tt has to be MFVideoFormat_RGB32 for the EVR but my webcam will only accept MFVideoFormat_RGB24.