I have bought some music online, delivered in WAV format, presumably highest quality, supposing there was no transcoding happening, but anyway, straight to my question:
My intention is to get at least some minimum understanding of two
flac's (man page) options:
Do exhaustive search of LP coefficient quantization (expensive!). Overrides
-q; does nothing if using
Do exhaustive model search (expensive!).
It is absurdly unclear to me, as to just an average music listener, what these settings actually do?
OS + FLAC versions: I am on converting the WAV file to FLAC on Linux Mint 20 (Ubuntu Focal base) with FLAC version 1.3.3.
Several details on original file in WAV format I am testing this on:
file dopamine-remix.wav RIFF (little-endian) data, WAVE audio, Microsoft PCM, 16 bit, stereo 44100 Hz # + mediainfo dopamine-remix.wav General Complete name : dopamine-remix.wav Format : Wave File size : 86.7 MiB Duration : 8 min 35 s Overall bit rate mode : Constant Overall bit rate : 1 411 kb/s Audio Format : PCM Format settings : Little / Signed Codec ID : 1 Duration : 8 min 35 s Bit rate mode : Constant Bit rate : 1 411.2 kb/s Channel(s) : 2 channels Sampling rate : 44.1 kHz Bit depth : 16 bits Stream size : 86.7 MiB (100%)
The exact 3 commands I issued for testing purposes were:
# this equals to -8 compression flac --verify --best --output-name=dopamine-remix--8.flac dopamine-remix.wav # this equals to -8 -e compression flac --verify --best --exhaustive-model-search --output-name=dopamine-remix--8e.flac dopamine-remix.wav # this equals to -8 -e -p compression flac --verify --best --exhaustive-model-search --qlp-coeff-precision-search --output-name=dopamine-remix--8ep.flac dopamine-remix.wav
Having no idea what different the output is supposed to be(?)
Anyway, I am intentionally not stating how much time these commands took. Please, consider that I do not care about the time spent. For the sake of this question, let's suppose I just want to achieve the best overall compression achievable with FLAC. Thank you.