this post was submitted on 13 Mar 2024
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Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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Hi Zedstrain If compressing, why not opus? AAC is almost as good but you have to make sure you're using a good encoder, and its licensing is not as open.
Anyway I found this table, next to "Music Storage", it shows the suggested bitrate values depending on the number of audio channels, from 96 to 450. Should applicable to movies, and to AAC (maybe adding 10% bitrate?).
For movies I'd use these values personally:
2 channels: kbps 128 (150 AAC)
6 (5.1): 196 (224 AAC)
8 (7.1): 256 (300 AAC)
As I don't want to reduce the quality of an already lossy codec, I'm instead comparing identical audio tracks of the same release that differ only in their codecs and bitrates. For instance, would a stereo 224kbps AC3 audio track be equivalent to a 128kbps AAC audio track, or is one of the two better than the other?
From a quick look on wikipedia, looks like AC3 does not support VBR. That is enough to make AAC twice as good at least, especially since movies have a lot of silence in them, so your ratio of 1:2 equivalence seems right to me