ffdshow tryouts project: Discussion & Development - Page 500

albain · 29th December 2009, 21:27

Quote:

Originally Posted by MatMaul

Yes, and I think the main reason is that DXVA2 seems to support the retrieving of picture from GPU memory to the main memory (so no need for a specific renderer) which is needed to work with VLC because it doesn't support any standard directshow renderer.

Are you sure about that ?

Because I read DXVA 2 docs a while ago and they didn't mention this possibility. Also the DXVA (1 or 2) APIs take an encoded picture and returns nothing

If it was possible to grab a decoded picture back from the GPU memory (which I doubt), then ffdshow internal filters could work

EDIT : the patch you mentioned is from VLC team, not ffmpeg. The benefit I see is that APIs are finally all included into ffmpeg but there are still some stuff that have to remain into directshow layer (so ffdhow code) such as the DXVA allocator...
But afterwards it is not very different from MPC patch, maybe cleaner, I don't know yet

tetsuo55 · 29th December 2009, 21:50

Quote:

Originally Posted by albain

Are you sure about that ?

Because I read DXVA 2 docs a while ago and they didn't mention this possibility. Also the DXVA (1 or 2) APIs take an encoded picture and returns nothing

If it was possible to grab a decoded picture back from the GPU memory (which I doubt), then ffdshow internal filters could work

EDIT : the patch you mentioned is from VLC team, not ffmpeg. The benefit I see is that APIs are finally all included into ffmpeg but there are still some stuff that have to remain into directshow layer (so ffdhow code) such as the DXVA allocator...
But afterwards it is not very different from MPC patch, maybe cleaner, I don't know yet

thats the whole idea with dxva2, completely independent, you can renderer it to a dx surface and then take that image into the ffdshow postprocessing chain

MatMaul · 29th December 2009, 22:35

Quote:

Originally Posted by albain

EDIT : the patch you mentioned is from VLC team, not ffmpeg. The benefit I see is that APIs are finally all included into ffmpeg but there are still some stuff that have to remain into directshow layer (so ffdhow code) such as the DXVA allocator...
But afterwards it is not very different from MPC patch, maybe cleaner, I don't know yet

I think it is still a lot cleaner since you can directly use the public ffmpeg API and not some exported functions.

NiFa · 29th December 2009, 23:27

Is there any plans to add DTS encoding support to ffdshow?
Sorry if this was asked earlier.

73ChargerFan · 30th December 2009, 07:15

No freeware dts encoder has been written, they are all commercial.

NiFa · 30th December 2009, 18:12

How come, that no one have written freeware or open source dts encoder? I so hope that someone would do it, but I can't do anything 'bout it if no one is willing to do it.

SamuriHL · 30th December 2009, 18:15

The specs aren't available afaik.

tetsuo55 · 30th December 2009, 18:17

Quote:

Originally Posted by NiFa

How come, that no one have written freeware or open source dts encoder? I so hope that someone would do it, but I can't do anything 'bout it if no one is willing to do it.

the company that owns DTS is very willing and able to sue anyone who dares to try. But the main reason is that they keep all their technoligy secret, reverse engineering from nothing is very difficult.

NiFa · 30th December 2009, 18:18

Ok, now I understand, thanks to making this clear.

markanini · 30th December 2009, 19:07

I agree Support for <Vista is more important than WinXP. It's an outdated OS with some issues in media support compared to later Windows versions. Maybe detecting Windows version and applying DXVA1/2 accordingly would be feasable?

Keiyakusha · 30th December 2009, 20:19

Isn't AC3 with the same bitrate as DTS gives twice better quality?

SamuriHL · 30th December 2009, 20:21

AC3 is limited to 640kbps. DTS can do up to 1.5mbps.

Keiyakusha · 30th December 2009, 20:29

Quote:

Originally Posted by SamuriHL

AC3 is limited to 640kbps. DTS can do up to 1.5mbps.

Yes, but AC3 640 kbps gives the same quality as DTS 1.5mbps.
Can anyone confirm or deny?

SamuriHL · 30th December 2009, 20:31

Quote:

Originally Posted by Keiyakusha

Yes, but AC3 640 kbps gives the same quality as DTS 1.5mbps.
Can anyone confirm or deny?

That's not my feeling on it, no. Back when I was doing DVD regularly, DTS always sounded much better for a variety of reasons. One of which is the higher bitrate, but, there are others, too.

Keiyakusha · 30th December 2009, 20:32

But higher bitrate doesn't mean higher quality if we talking about different formats

SamuriHL · 30th December 2009, 20:47

http://www.audioholics.com/education...of-the-formats

I don't want to take this thread further off topic, but, that should help.

Snowknight26 · 30th December 2009, 21:06

The tooltip for Auto under Input Levels in ffdshow's video config is a bit misleading. It doesn't say whether ffdshow will disregard the flag or not.

tetsuo55 · 30th December 2009, 21:12

DTS is should be better, but i doubt it really matters for realtime encoding

_xxl · 30th December 2009, 21:32

There is a soc project for dca encoding here:
svn://svn.mplayerhq.hu/soc/dcaenc
This source is based on code from here:
http://roundup.ffmpeg.org/roundup/ff...0080207.tar.gz

SamuriHL · 30th December 2009, 21:33

Quote:

Originally Posted by tetsuo55

DTS is should be better, but i doubt it really matters for realtime encoding

I would completely agree with that.

30th December 2009, 18:15	#9987 \| Link
SamuriHL Registered User Join Date: May 2004 Posts: 5,351	The specs aren't available afaik. __________________ HTPC: Windows 11, AMD 5900X, RTX 3080, Pioneer Elite VSX-LX303, LG G2 77" OLED

30th December 2009, 20:21	#9992 \| Link
SamuriHL Registered User Join Date: May 2004 Posts: 5,351	AC3 is limited to 640kbps. DTS can do up to 1.5mbps. __________________ HTPC: Windows 11, AMD 5900X, RTX 3080, Pioneer Elite VSX-LX303, LG G2 77" OLED

30th December 2009, 20:47	#9996 \| Link
SamuriHL Registered User Join Date: May 2004 Posts: 5,351	http://www.audioholics.com/education...of-the-formats I don't want to take this thread further off topic, but, that should help. __________________ HTPC: Windows 11, AMD 5900X, RTX 3080, Pioneer Elite VSX-LX303, LG G2 77" OLED

30th December 2009, 21:12	#9998 \| Link
tetsuo55 MPC-HC Project Manager Join Date: Mar 2007 Posts: 2,317	DTS is should be better, but i doubt it really matters for realtime encoding __________________ MPC-HC, an open source project everyone can improve. Want to help? Test Nightly Builds, submit patches or bugs and chat on IRC

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29th December 2009, 23:27	#9984 \| Link
NiFa Audio & video enthusiast Join Date: Nov 2009 Location: Finland Posts: 74	Is there any plans to add DTS encoding support to ffdshow? Sorry if this was asked earlier.

30th December 2009, 07:15	#9985 \| Link
73ChargerFan Registered User Join Date: Dec 2006 Posts: 523	No freeware dts encoder has been written, they are all commercial.

30th December 2009, 18:12	#9986 \| Link
NiFa Audio & video enthusiast Join Date: Nov 2009 Location: Finland Posts: 74	How come, that no one have written freeware or open source dts encoder? I so hope that someone would do it, but I can't do anything 'bout it if no one is willing to do it.

30th December 2009, 18:18	#9989 \| Link
NiFa Audio & video enthusiast Join Date: Nov 2009 Location: Finland Posts: 74	Ok, now I understand, thanks to making this clear.

30th December 2009, 19:07	#9990 \| Link
markanini Registered User Join Date: Apr 2006 Posts: 299	I agree Support for <Vista is more important than WinXP. It's an outdated OS with some issues in media support compared to later Windows versions. Maybe detecting Windows version and applying DXVA1/2 accordingly would be feasable?

30th December 2009, 20:19	#9991 \| Link
Keiyakusha 契約者 Join Date: Jun 2008 Posts: 1,576	Isn't AC3 with the same bitrate as DTS gives twice better quality?

30th December 2009, 20:32	#9995 \| Link
Keiyakusha 契約者 Join Date: Jun 2008 Posts: 1,576	But higher bitrate doesn't mean higher quality if we talking about different formats

30th December 2009, 21:06	#9997 \| Link
Snowknight26 Registered User Join Date: Aug 2007 Posts: 1,430	The tooltip for Auto under Input Levels in ffdshow's video config is a bit misleading. It doesn't say whether ffdshow will disregard the flag or not.

30th December 2009, 21:32	#9999 \| Link
_xxl ffdshow user Join Date: Oct 2005 Location: Romania Posts: 818	There is a soc project for dca encoding here: svn://svn.mplayerhq.hu/soc/dcaenc This source is based on code from here: http://roundup.ffmpeg.org/roundup/ff...0080207.tar.gz