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TDA4VH-Q1: wave5 decoded buf is inconsistent with the requested number

Part Number: TDA4VH-Q1


rtos sdk 8.6.14

I found a special h265 file
File download link 
code show as below

The result of running the program is printed below

Why not 4 but 6?
When I debugged, I found that in the wave5 driver, this value is also 6

What does this register mean, and what determines this value? When I decode other files, I always apply for 4 bufs as I wish.