It would be under the SWAP tab (or should be)
And in the section for Decode AAC Audio with:
The latest FFDshow show had a issue with 5.1 AAC for some reson. If you dont have 5.1AAC then FFDshow will be fine for 2.0 and others
monogram is only needed for 5.1 AAC until the next FFDshow update
You may also want to double check the codecs, to be sure they are set properly.
Config TAB/ FFDSHOW Video Config
at top CODECS
H264 = ffmpeg-mt
MPEG2 & Other MPEG2=libmpeg2
Also CONFIG/FFDSHOW AUDIO CONFIG:
AAC=libfaad2 ((DISABLED if you set MONOGRAM))
I doubt these settings are a issue. They should be set correctly already, but worth double checking to be sure.
Curious, what are you resizing to? 1080P?
Also, just for a test to see if its the re-sizer or other issue,
turn off the resizer all together.
How does the Video playback with normal settings?