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Use High Efficiency AAC Instead of LC-AAC
Instead of using standard AAC for encoding calls, it can use HE-AAC from libfdk_aac to encode calls using less storage and make the archive smaller. The library libfdk_aac is more widely supported than 3 years ago and FFmpeg has support for HE-AAC. I believe the source code could be modified to include he-aac in the FFmpeg args in ffmpeg.go.
The reason is to reduce the storage space of recorded calls so less storage is needed for an entire archive of audio.
I have modified the file server/ffmpeg.go to include aac_he_v2 arguments and it works after recompiling. I will be making a Pull Request soon.
Go to #480