[jjd-uk]

Something wrong with your caps lock?

[Martijn]

and something with your computer as i have three win7 64bit and none of them experience any issues with running any 32bit application

[djfred93]

Just for ProRes 1080p, Ffmpeg have optimization which are only available in x64.

http://forum.doom9.org/showthread.php?p=...ost1661682

http://forum.doom9.org/showthread.php?p=...ost1661734

http://forum.doom9.org/showthread.php?p=...ost1662800

Of course, it's only for ProRes, a minor format but if future codec are all like this, that's probably a good reason.

And Microsoft can remove the win32 compatibility in their future OS.

[warlion]

This is really interesting thread, I'm also interested on a 64bit xbmc at some point xbmc will had to migrate until now I will keep an eye on this thread for future developing

[MartinZ]

I would also like to get 64bit version of XBMC.

Reason - I prefer to use 64 bit OS.

MYTH - there is no reason to have more than 4GB of memory for HTPC.
TRUTH - Windows will use any spare memory for cache manager. With cheap memory, it's perfect way how to boost up your HDD performance actually. Read following (part about general cache manager in Windows):
http://blogs.citrix.com/2012/10/25/pvs-i...e-manager/

MYTH - there is no performance gain in using 64bit.
TRUTH - there is performance impact when using 32bit program on 64bit OS:
http://www.viva64.com/en/l/0002/

"Different processor architectures have a bit different WoW64. For example, the 64-bit Windows version developed for Intel Itanium 2 processor employs WoW64 to emulate x86 instructions. This emulation is rather resource-intensive in comparison to WoW64 for Intel 64 architecture because the system has to switch from the 64-bit mode to compatibility mode when executing 32-bit programs.

WoW64 on Intel 64 (AMD64 / x64) does not require instruction emulation. In this case the WoW64 subsystem emulates only the 32-bit environment through an additional layer between a 32-bit application and the 64-bit Windows API. In some places this layer is thin, in others a bit thicker. For an average program, you may expect 2% performance penalty because of this layer. For some programs, it can be larger. Two per cent is not very much but keep in mind that 32-bit applications work a bit slower under the 64-bit Windows than in the 32-bit environment."

I've done user load testing few times before, we've seen CPU\memory penalty of 10-30% (depending on application).

[Martijn]

MYTH: XBMC would actually benefit from this.
FACT: it will be of no significant use for XBMC

[floatingcloud]

http://software.intel.com/en-us/articles...ns-windows

[HenryFord]

And... What is it you want to tell us with that link? We're more than familiar with the memory limits. And XBMC doesn't need that much memory which makes your point moot

[Martijn]

Runs on a Raspberry Pi with 512mb

[da-anda]

even runs in a raspberry pi with 256 mb

[Ned Scott]

At this point I think 64-bit versions of XBMC are really just preparing for the future. I have Mac OS X 64-bit, but I still use the 32-bit version of XBMC simply because it occasionally has less problems than XBMC 64-bit (unless I'm testing, then I want to catch problems). No real performance improvements yet, but maybe in the future.

[floatingcloud]

And... What is it you want to tell us with that link? We're more than familiar with the memory limits. And XBMC doesn't need that much memory which makes your point moot

To point out to those that want 64bit that there really is very little benefit from a memory space perspective.

[HenryFord]

Ah sorry, got you wrong there

[voguemaster]

Did anyone consider the downside of moving to 64-bit? Aside from the development time for code conversion and testing of course. Being on the FFmpeg devel mailing list (mostly reading) I see many patches and codec support for x86. I'm not sure everything is well supported in 64-bit like it is with 32-bit.
I did not test all containers and codecs of course but I see many patches concentrate on x86 so it really stand to ask - how good is the support for various formats in 64-bit compiled FFmpeg?

[Memphiz]

Nah ffmpeg is fine for 64bit. x86 includes 64bit in ffmpeg iirc. We use it along time on osx already (where XBMC is compiled as 64bit). Its just that the claimed benefits are not there in real world.