EGLStream and Argus problems

Robotics & Edge Computing Jetson & Embedded Systems Jetson AGX Xavier
4

okay, just think about single producer and single consumer cross process.
why I can’t get correctly FD from EGLStreamKHR？

Official documents described as folloows:

    On failure the functions returns EGL_NO_FILE_DESCRIPTOR_KHR and
    generates an error

        - EGL_BAD_DISPLAY is generated if <dpy> is not a valid
          initialized EGLDisplay

        - EGL_BAD_STREAM_KHR is generated if <stream> is not a valid
          EGLStreamKHR handle created for <dpy>.

        - EGL_BAD_STATE_KHR is generated if <stream> is not in the
          EGL_STREAM_STATE_CREATED_KHR state or if
          eglGetStreamFileDescriptorKHR() has previously been called
          on this <stream>.

        - EGL_BAD_STATE_KHR is generated if <stream> was not created
          by eglCreateStreamKHR (e.g. if it was created by
          eglCreateStreamFromFileDescriptorKHR).

https://www.khronos.org/registry/EGL/extensions/KHR/EGL_KHR_stream_cross_process_fd.txt

the EGLStreamKHR’s state is right(EGL_STREAM_STATE_CREATED_KHR), So the eglGetStreamFileDescriptorKHR() has previously been called on this EGLStreamKHR inside Aegus???

thanks