DirectShow Editing Services memory limit under Windows7 64 bit

[tuvman]

Hello I compiled XTLTest as 64 bit and attempted to test some XTLs
under windows 7 x64.

All these tests were done using an XTL with one clip from the WMV
showcase, with a timeline sized at 1440x1080.

1. buffering set to 300 - plays back fine.
2. buffering set to 600 and got a cant run graph error. Recompiled
with large memory aware (which should be set by default on 64 bit
apps), same thing.
3. Tested at 310 and worked fine.
4. Tried playing out 2 different instances of 64 bit XTLTest at the
same time with 310 buffering, and the second one fails with 'can't run
graph'.
5. buffering set to 80, was able to play 4 instances of XTLTest using
a combined 4GB of memory. Execute any more instances and can't run
graph.
6. Compiled .NET application targeted at any using DirectShowLib, and
comfirmed its running as 64 bit native app. I was able to load 4 XTLs
at 80 buffering until I got

System.Runtime.InteropServices.COMException (0x8007000E): Not enough
storage is available to complete this operation.

So I can an only conclude that the DES subsystem has a 4GB memory
limit for all applications combined.

Is this true? If so is this a DES limit or a DirectShow limit and is
there any way to workaround?

best,
Tuviah Snyder
Lead programmer, MediaWan
Solid State Logic, Inc