Unable to seek using "External player with playlist"

[ThatsGobbles]

Hello all, for the life of me, I can't seem to figure out how to get a seekable stream when using "External player with playlist". Both Winamp and foobar have a greyed-out seek bar, but I'm able to play files just fine.

I've tried both the default ffmpeg decode:

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ffmpeg -i %s -ab %bk -v 0 -f mp3 -

...as well as a custom two-part FLAC->LAME pipeline:

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flac --totally-silent --decode --stdout %s

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lame --silent -h -b %b -

Any assistance? Being able to seek is very important for me, so I'd be very sad if I couldn't get this working. Thanks!