ffdshow should have an option to detect a situation where a mono audio source has been encoded into either the left or the right stereo channel and use the appropriate channel as a mono stream.
At present ffdshow treats such situations as normal stereo channels, which leads to one channel being silent.
Fixing this would be easy:
1) detect if only one of the current file's audio channels contain non-zero data (or have a threshold slider for easy adjustment).
2) use the non-zero channel as a mono source.
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