avstream sample avshws has freeze issue in YUY2 format!!

Hi, All:

I have a problem withe the sample in DDK avstream\avshws, remove the RGB24 output format, just only output YUY2 format, then build and install it, preview in Amcap2, preview->Pause->preview, the preview will freeze. Any body know how to fix it?

The following are the test result:
Test result:

1. Preview avshws with amcap2, start preview > stop preview > start preview , the preview freezed. I found if not rebuild graph, just stop then resume graph, the preview freeze. (YUY2 only, all platform)

2. Preview avshws, then sleep > wake up , the preview freeze. (YUY2 only, vista64 )

3. Preview avshws, then switch user > switch back , the preview freeze. (YUY2 and RGB24, win764)


Please help me, thank you very much!!!

The freeze issues for YUY2 can be more easily reproduced on Win7 X64.

anybody can help me?