Function vaMFSubmit 

pub unsafe extern "C" fn vaMFSubmit(
    dpy: VADisplay,
    mf_context: VAMFContextID,
    contexts: *mut VAContextID,
    num_contexts: c_int,
) -> VAStatus

Make the end of rendering for a pictures in contexts passed with submission. The server should start processing all pending operations for contexts. All contexts passed should be associated through vaMFAddContext and call sequence Begin/Render/End performed. This call is non-blocking. The client can start another Begin/Render/End/vaMFSubmit sequence on a different render targets. Return values: VA_STATUS_SUCCESS - operation successful, context was removed. VA_STATUS_ERROR_INVALID_CONTEXT - mf_context or one of contexts are invalid due to mf_context not created or one of contexts not assotiated with mf_context through vaAddContext. VA_STATUS_ERROR_INVALID_PARAMETER - one of context has not submitted it’s frame through vaBeginPicture vaRenderPicture vaEndPicture call sequence. dpy: display mf_context: Multi-Frame context contexts: list of contexts submitting their tasks for multi-frame operation. num_contexts: number of passed contexts.