Re: WPF MediaKit, SlimDX and 64bit

Wow 64bit that is so sweet. But for "simple" video playback, DVB (digital-TV) and DVD should work just fine under x64 (or?)

Can't wait for testing your new stuff Jer.

Re: WPF MediaKit, SlimDX and 64bit

I can't believe I hadn't heard about SlimDX! I guess I'm a full fledge WPF convert after all. 64bit support is very sweet! Keep up the good work.

-Eric

Re: WPF MediaKit, SlimDX and 64bit

I actually was the one to open the missing 9Ex support as an issue in the SlimDX. They did a great job to have something cooked for it in no time: http://code.google.com/p/slimdx/issues/detail?id=322&colspec=ID%20Type%20Status%20Priority%20Owner%20Summary

SlimDX seems to be the best managed wrapper for DirectX currently and the crew seems to be very active on implementing features requested by the users.

Sorry for sounding like a advertisement and no I'm not affiliated with the SlimDX project or the crew behind it.

Re: WPF MediaKit, SlimDX and 64bit

Hi Jeremiah, have you seen the VLCElement s: http://forum.videolan.org/viewtopic.php?f=14&t=36249&st=0&sk=t&sd=a ?

Found it when googling around. perhaps this project also should be updated to use the new mediakit?

Re: WPF MediaKit, SlimDX and 64bit

Hi simsod,

I had modified someones VLC ->WPF project that used the inefficient WriteableBitmap to render video, to use the VRE. I did this mostly for testing/play purposes. I honestly don't think that VLC is good to be used as a 3rd party library per say, but I think WPF could spruce up their UI quite a bit. If you are looking for compatibility with most types of media, I suggest the FFDSHOW DirectShow filter. I haven't found any audio/video that it could not play. http://ffdshow-tryout.sf.net/

Re: WPF MediaKit, SlimDX and 64bit

Although I have Vista, I haven't had a chance to play with the WPF stuff on it when integrating with Direct3D. I put the support for 9Ex into SlimDX, but I never actually compared it against a regular 9 device when using WPF. How serious is the perf penalty that everyone talks about here? I find it difficult to believe it could be "that bad", but I really haven't looked into it and I don't remember the Ex devices interacting with the driver any differently...

Re: WPF MediaKit, SlimDX and 64bit

It's hard to give a blanket statement on performance with 9Ex, because it really depends on the scene. In this particular video scenario, it's over a 2x performance hit.

Thanks again for adding the 9Ex support! It was very much needed!

-Jer

Re: WPF MediaKit, SlimDX and 64bit

Hello Jeremiah,

I am very interested in your project! Indeed, I am building a WPF application that has support for video playback. I am having a hard time finding a good library for it. I have tried VLC with a WinForm interop, but that does not help build my UI the way I want. I am also not convinced with the VLC->WPF project you mentioned above. If you had to build such a project, what library/component would you use?

Another question, more specific to your project: I have made some tests with the preview you released earlier and I am a bit surprised as regards the performances. Your sample application uses 25-30% of my CPU, when MPC, VLC and my WPF application with VLC use between 2 and 8%. Do you have the same results when you test it? Can it be improved?

Thanks in advance for your answer.

Damien

Re: WPF MediaKit, SlimDX and 64bit

Try benchmarking against mediaelement. Your gpu may not be performant enough. Will post more later. Just got on plane.

Re: WPF MediaKit, SlimDX and 64bit

Hello Jeremiah,

I have run some more benchmarking. I have created a minimal WPF application for this and used alternatively the WPF MediaElement and your MediaUriElement. My computer is equipped with an Intel P4 530J (3.0GHz, HT) and a Radeon X800XL (256MB RAM). Here are my CPU usage:

ME vs MUE
Divx low bitrate and reso 1-2% vs 12-15%
Divx higher bitrate and reso 5-6% vs 18-25%
MPEG2 3-5% vs 30-35%

Concerning WPFMediaKit, I have also noticed that the bigger the video output (I have a 1920x1200 resolution) the higher the CPU usage. I haven't noticed such a thing for MediaElement.

I hope this can help you.

Re: WPF MediaKit, SlimDX and 64bit

Damien,

This is really odd. I have a single core 3.4ghz w/ a slow old ATI x600 mobility and the D3D video player was able to do a 1080p WMV file at ~45% CPU usage, MediaElement at ~50% and Windows Media Player, ironically was ~55% CPU.

Testing on my Nvidia 9800 w/ 512 megs of RAM, 2.6ghz, I noticed that MediaElement runs slightly faster than my D3DImage player, but not by much (around 4% better).

What operating system did you test on? Vista or XP, 32 or 64 bit?

-Jer

Re: WPF MediaKit, SlimDX and 64bit

Jeremiah,

I run XP, with SP3, 32 bit. I will make some test on my laptop tonight to see if it comes from my computer.
Let me know if you need more info or if you want me to test a specific file.

Damien

Re: WPF MediaKit, SlimDX and 64bit

I have not tested on XP at all, only Vista 32 and 64. The Vista computers I have been testing on have had great performance (otherwise I would not have gone this route). If you have a link to a media file, I can tell you what my CPU usage is on it.

Try out the fighter pilot WMV from here: http://www.microsoft.com/windows/windowsmedia/musicandvideo/hdvideo/contentshowcase.aspx

I get ~8% CPU on this 2.6ghz quad core, which if I multiply by 4, that's 32% of one core. In plain old WMP, i get about ~7%, which translates to ~28% of a single core. WMP in Vista does use Media Foundation for WMV files, but overall I'm happy with the comparison.

Re: WPF MediaKit, SlimDX and 64bit

I have made more tests with this video: http://download.microsoft.com/download/2/0/9/20907788-993F-4EF6-8D75-F0DD93207FB8/SuperSpeedway_720.exe

MediaUriElement: 40-45%
MediaElement: 20-25%
MediaPlayerClassic: 15-20%
VLC 0.8.6: 40-45%
VLC 0.9.2: 25-30%
WMP: 20-25%

Re: WPF MediaKit, SlimDX and 64bit

I forgot to mention that I didn't use "Fighter Pilot" because it cannot run smoothly with MediaUriElement and VLC 0.8 (it works with the others though).

I also noticed that MediaUriElement is the only one on my computer to decode correctly the audio track of both videos. But I guess I am just missing a codec.

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