Availability of pure hw decoding session

Hi,

is there any way to find out if i am out of hw decoding resources? Neither MFXInit nor any MFXVideoDECODE_ functions return with a

warning or error in my case, while after 8 or 9 sessions (1080p) or 4 sessions (4k) the decoder delivered no more frames.

Ideally i'd like to get an error or warning from MFXInit to switch to software decoding.

Thanks for any hints!

regards,

Stephan