Re: EVR and MediaFoundation Support Coming to WPF MediaKit

Great news, I am thinking of completely abandoning mediaelement.
Just one problem I have been facing in wpfmediakit is that I am unable to include the audio in the VideoCapturePlayer. I have tried modifying the SetupGraph but in vain. Is there something I am missing?

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

If MF makes it easier, then im excited. However if its like everything else that microsoft release, its going to be several versions off being a good product.

They kinda hint that bluray is doable in MF. this would get me interested.


Anton

PS, mediakit is working a treat for me

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

Jer,

I'm definitely interested in EVR support ... how do you think the performance will compare with your VMR9 work?

-Eric

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

EVR support would be really great! Not only does it provide better framerate stability but it also uses DXVA2 acceleration to achieve better deinterlacing through the GPU (if supported). Rendering performance is slightly lower for me, but only few percent (which are good invested I think for more stable frame rate).

It is too bad that most of my users still have Windows XP, so I am stuck with leaving the WinForms approach in for backwards compatibility (WPF has no VSync on XP so you get tearing on the video). If most had Vista then I'd completely drop the messy WinForms interop layer and could make use of the cool possibilities that direct rendering to WPF provides.

Media Foundation is not really useable right now. As long as they do not provide better native support and something like a "BluRayNavigator" similar to the DVDNavigator to do the hard bits, I do not intend to use it (except for the EVR part which I am using right now but only through WinForms layer :-/ ). It is great to hear what you said about MF and Windows 7, I will perhaps start taking a look at the beta if I find the time!

Lukas

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

Hey Jer, good to see I'm not the only crazy bastard. I too started an EVR presenter for WPF. Turned out to be a waste of time though after talking to some guys at Microsoft. As it turns out MediaElement uses an internal "rapid update" call in their EVR presenter implementation -- so we're never ever going to achieve MediaElement's frame rate via D3DImage et al. I'm betting EVR will yield the exact same results you're getting with VMR9.

On an unrelated note... you might be interested in writing your MediaElement hack filter in C# to avoid the COM rego thing... Thats is what I do for sichbopvr (custom TS recording sink, and then source filter/mpeg 2 & 4 demux, all in C# etc -- no COM register required.) I've uploaded an example here for ya (and anyone else i guess); www.sichbo.ca/Free_Code/100_C_Sharp_directshow_filters

In the meantime I've given up on MediaElement and embedded WPF video in my project. The ME's playback behaviour is unpredictable when the video source is not necessarily present (say a satellite feed for instance with delayed tuning, no frames ready to push during the "Play()" call.)

Good luck with the EVR presenter anyway! it'll be a good reference if nothing else. Maybe some day MS will find a business reason to expose their private rapid update function.

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

Sichbo, your code for the C# filter looks great. I can't wait to give it a shot!!

I'm not really writing an EVR presenter for better performance, but more of a compatibility piece for MediaFoundation (DShow is going the way of Winforms)...And because the VMR9 seems to scale the color for HD TV (ie 16-235)...With no way to configure it. EVR does something similar depending on the driver, but it seems most new video drivers have support for turning this off.

I agree and I do expect general performance to be near VMR9 as they both eventually use WPF to render via D3DImage. On my rig, D3DImage is incredibly fast, showing little CPU with just updates of the surface, even with 1080p surfaces. I do expect better performance in certain situations though, such as DXVA2 and other special duties of the EVR (ie deinterlacing).

I'm not sure what rapid update function MS is referring to, but I suspect its more related to the EVR presenter updates being synced to the render thread of WPF, not the UI thread like D3DImage is.

Thanks again for sharing that code!

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

I'm definitely interested in EVR support ... how do you think the performance will compare with your VMR9 work?

Re: EVR and MediaFoundation Support Coming to WPF MediaKit

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