• first I run ProcessInput and ProcessOutput in different thread.
  one for ProcessInput and another for ProcessOutput then I combine
  it in one thread but same error. always blocked with no return.
• and I write the data what I ProcessInput and use CCPlay I can
  play it (H264).
• then I write Console Application of C++ and read all the H264 file in
  Step1 and with same code to ProcessOutput yes it succeed.
• but the original code can not I do not know why.

I compare the two code all is same. InputMediaType and OutputMediaType is same settings is same.

what is different is to run first code in thread.

and others.
transform.GetOutputStreamInfo returns with dwFlags=263(blocked) and dwFlags=7(succeeded)

first I can not use to GetCurrentLength to the OutputMediaBuffer it returns 0.
and with dwFlags=7 which run in Console returns the right DWORD value.

you may say I should copy the demo here but the code is too large.
and you may say I should write small demo here. but the small demo runs successfully.