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Encode/AAC – FFmpeg
https://trac.ffmpeg.org/wiki/Encode/AAC#:~:text=FFmpeg%20supports%20two%20AAC-LC%20encoders%20%28aac%20and%20libfdk_aac%29,incompatible%20code%20when%20GPL-licensed%20code%20is%20also%20included.
Encode/AAC – FFmpeg
https://trac.ffmpeg.org/wiki/Encode/AAC
ffmpeg - How to encode audio in AAC-LC, AAC-HE-V1, …
https://stackoverflow.com/questions/18894810/how-to-encode-audio-in-aac-lc-aac-he-v1-aac-he-v2-using-libavcodec
from the above reading it will be clear to you that in order to encode audio in HE-AAC/ HE-AAC-V2 you have to use libfdk_aac or libaacplus. I will explain how you can do it using libfdk_aac: first make sure you configure ffmpeg along with following options:--enable-libfdk_aac --enable-nonfree
Converting Audio to AAC using ffmpeg - Super User
https://superuser.com/questions/684955/converting-audio-to-aac-using-ffmpeg
When converting to .aac from a source in m4a/mp4, you don't even need to re-encode: ffmpeg -i input.m4a -c:a copy output.aac. Note: FFmpeg tries to guess the output format from the output file name. If you need to force the format for ADTS (.aac file), use -f adts (e.g. when working with piped streams instead of files):
FFmpeg Codecs Documentation
https://ffmpeg.org/ffmpeg-codecs.html
8.1 aac. Advanced Audio Coding (AAC) encoder. This encoder is the default AAC encoder, natively implemented into FFmpeg. 8.1.1 Options b. Set bit rate in bits/s. Setting this automatically activates constant bit rate (CBR) mode. If this option is unspecified it is set to 128kbps. q. Set quality for variable bit rate (VBR) mode.
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