Flash crashes when stopping directshow source filter

Question

Here's the callstack :

0480b000()
vcam.ax!CSourceStream::DoBufferProcessingLoop() + 0xe1 bytes
vcam.ax!CSourceStream::ThreadProc() + 0x13e bytes
vcam.ax!CAMThread::InitialThreadProc() + 0x51 bytes
kernel32.dll!7c80b713()

The callstack is from this thread:

0    >    0x000015b8    Worker Thread    CAMThread::InitialThreadProc    0480b000    Normal    0

disassembly code:

017D0B5B  push        edx 
017D0B5C  mov         eax,dword ptr [ecx+8]
017D0B5F  call        eax 
017D0B61  cmp         esi,esp
017D0B63  call        @ILT+2525(__RTC_CheckEsp) (17C49E2h)
017D0B68  cmp         dword ptr [ebp-2Ch],0
017D0B6C  je          CSourceStream::DoBufferProcessingLoop+10Ah (17D0B8Ah)
017D0B6E  mov         eax,dword ptr [ebp-2Ch]

Problem exists at the line 017D0B5F call eax

This problem exists for most directshow filters ,how to fix?

Answer 1

I believe vcam.ax's source code is here, so probably the best option is to compile the source code locally and then attach to the process that's crashing in the debugger. Then you can put a breakpoint in the DoBufferProcessingLoop() implementation, recreate the crash, and you should be able figure out why you're crashing.