- Moved to libfdk_aac (because it's also used for homekit and has some nicer profiles that can be used)
- use High efficiency profile
- use as many threads as core are available
- avioflag and flush_packages flags to minimise latency
- max_delay to make sure the delay won't grow endlessly
- filter audio below 200hz en above 2500hz and use the afftdn filter to limit background noise and such
- Limit bitrate to 16K , this seems to help agains crackling sound (maybe because it speeds up transcoding). Audio still seems very acceptable with 16K
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