Filter graph not using HW decoding though available

#1
Greetings, I can't manage how do I force Prog to support HW decoding (QuickSync) for SD channels.

ProgDVB + H.264/AVC (video codec configured for QuickSync) -> HW decoding active
Other player + H.264/AVC (video codec configured for QuickSync) -> HW decoding active
ProgDVB + MPEG2 (video codec configured for QuickSync) -> HW decoding not used
Other player + MPEG2 (video codec configured for QuickSync) -> HW decoding active
ProgDVB + MPEG2 (video codec configured for CUVID) -> HW decoding active

The table shows that the not using HW decoding problem only appears in combination of ProgDVB with MPEG2 and QuickSync.
As proved by another video player QuickSync can actually decode MPEG2.
As video codec I'm using LAV filters which proves to work as expected everywhere except this case.

I'd appreciate an diagnostics (where QS is blocked)? Thanks
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