Does gstreamer support XvMC?

[Zhao, Halley]

mplayer or xine could use XvMC to offload some video(mpeg2) decoding to GPU as following:

mplayer -vo xvmc -vc 

xine -V xvmc 

 

But I can’t find a way to make gstreamer(totem) to use xvmc.

I suspect gstreamer can’t support XvMC, is it correct?

 

BTW, if gstreamer (totem) and mplayer both use codecs from ffmpeg, why gstreamer(totem) can’t use xvmc?

 

 

Thanks.

 

 

ZHAO, Halley (Aihua)

Email: halley.zhao[hidden email]

Tel: [phone]

iNet: 8821-6476

SSG/OTC/UMD 3W033

 

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[David Schleef]

On Fri, Aug 22, 2008 at 01:14:32PM +0800, Zhao, Halley wrote:
> mplayer or xine could use XvMC to offload some video(mpeg2) decoding to GPU as following:
>
> mplayer -vo xvmc -vc
>
> xine -V xvmc
>
> But I can't find a way to make gstreamer(totem) to use xvmc.
> I suspect gstreamer can't support XvMC, is it correct?

That's correct.  There's really no point to using XvMC on a typical
desktop machine, as the CPU has plenty of power to decode SD MPEG-2.

As an aside, XvMC is a really horrible interface to use to build a
decoder.  I've written several gstreamer elements for hardware decoders
before, creating one with XvMC would be like poking my eye repeatedly
with a sharp stick.



dave...


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[Zhao, Halley]

　　Great thanks for your information.
　　My device doesn't have a powerful CPU.
　　
　　When I look into gst-ffmpeg codecs, I found there is XvMC support for Mpeg II, but it is ignored in gstffmpegcodecmap.c.
　　If I want to have a try for XvMC in gst, where should I make some changes? Totem? How big will the work load be?
　　
　　I assume the following task should be:
　　1> detect whether XvMC is enable or not from platform.
　　2> change the policy in auto-plug
　　   If XvMC is enabled from platform
　　         Use id CODEC_ID_MPEG2VIDEO_XVMC to create a caps from ffmpeg
　　   Else
　　         Use id CODEC_ID_MPEG2VIDEO to create a caps from ffmpeg
　　
　　Is it correct?
　　
　　
　　
　　
　　>-----Original Message-----
　　>From: [hidden email]
　　>[mailto:[hidden email]] On Behalf Of David
　　>Schleef
　　>Sent: 2008年8月22日 14:22
　　>To: Discussion of the development of GStreamer
　　>Subject: Re: [gst-devel] Does gstreamer support XvMC?
　　>
　　>On Fri, Aug 22, 2008 at 01:14:32PM +0800, Zhao, Halley wrote:
　　>> mplayer or xine could use XvMC to offload some video(mpeg2) decoding to
　　>GPU as following:
　　>>
　　>> mplayer -vo xvmc -vc
　　>>
　　>> xine -V xvmc
　　>>
　　>> But I can't find a way to make gstreamer(totem) to use xvmc.
　　>> I suspect gstreamer can't support XvMC, is it correct?
　　>
　　>That's correct.  There's really no point to using XvMC on a typical
　　>desktop machine, as the CPU has plenty of power to decode SD MPEG-2.
　　>
　　>As an aside, XvMC is a really horrible interface to use to build a
　　>decoder.  I've written several gstreamer elements for hardware decoders
　　>before, creating one with XvMC would be like poking my eye repeatedly
　　>with a sharp stick.
　　>
　　>
　　>
　　>dave...
　　>
　　>
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　　>Build the coolest Linux based applications with Moblin SDK & win great prizes
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　　>https://lists.sourceforge.net/lists/listinfo/gstreamer-devel

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