this post was submitted on 13 Mar 2024
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Piracy: ꜱᴀɪʟ ᴛʜᴇ ʜɪɢʜ ꜱᴇᴀꜱ
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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
Sorry I edited my other reply heavily because I noticed later that you were interested in some exact bitrate numbers.. I don't know enough about AC3 to know an equivalent number, all I can say is those numbers I've written for opus and AAC are in my experience enough to enjoy any movie.