LC-AAC vs. HE-AAC vs. HE-AAC v2
I'm compressing my movies and music archive to free up some space on my hard drive. I use HEVC for my videos, but not sure what AAC profile is suitable for my audio.
I got two questions:
1- Some of my movies have 6CH audio, mostly DTS and AC3 at 1500kbps. Which AAC profile should I choose for a 6CH at 192kbps? HE-AAC, HE-AAC v2 or LC-AAC? I read somewhere that HE-AAC and HE-AAC v2 are only good for low bitrate stereo and mono audio, and LC-AAC is optimized for higher quality. I'm wondering at the same bitrate (let's say 192kbps), does HE-AAC beat LC-AAC, or not, and which one works best for 6CH audio, HE or LC.
2- I have a huge music archive, all of them are MP3 at 320kbps. I wanna re-encode them to HE-AAC or HE-AAC v2 at 64kbps and free up 80% of the space it's taken. First, do I go for HE-AAC or HE-AAC v2, and second, How much details will I lose after converting? Is 64kbps enough or should I bump it to 80 or 96kbps?
Thanks in advance.