[UPROPERTY](Programming/UnrealArchitecture/Reference/Properties)(EditAnywhere, AdvancedDisplay, Category="Output", Meta=(ClampMin=1, ClampMax=8))
int32 NumberOfTextureBuffers
Number of texture used to transfer the texture from the GPU to the system memory. A smaller number is most likely to block the GPU (wait for the transfer to complete). A bigger number is most likely to increase latency.
Some Capture are not are executed on the GPU. If it's the case then no buffer will be needed and no buffer will be created.