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CD do FLAC-u

Odkedy mám slúchadlá Sennheiser, stal som sa prieberčivý v bitrateoch hudobných formátov. 128 kbps MP3 sú naozaj veľmi hudobne chudobné, v priemere mám asi 192 kbps MP3, nejaké Ogg-y a FLAC-y.

Pravdu povediac nedokážem rozlíšiť na svojich slúchadlách 256-320 kbps MP3 od FLAC-u, či CD. Aj Ogg-Vorbis, zhruba 100 kbps, mi znel v ušiach veľmi dobre. Miesta však mám celkom dosť a svoje obľúbené CD som sa rozhodol ripnúť do FLAC-u. Možno raz budem mať audio, keď ten rozdiel bude skutočne počuť a tiež mám pri počúvaní dobrý pocit, že zvuk je zhruba taký ako bol nahraný.

Klasicky softvér na ripovanie do FLAC-u je EAC (Exact Audio Copy) spolu so skriptom AutoFLAC. Slúži na konverziu stôp CD do wavu alebo iného formátu a jednou z jeho hlavných vlastností je oprava a úprava zvukových stôp. Keď som ripoval s EAC, FLAC-y zneli dosť tlmene oproti MP3 alebo CD. Boli o niekoľko dB tichšie a zdali sa mi aj menej dynamické a neviem čo to mohlo spôsobiť, pretože AutoFLAC používa originálny enkóder pre FLAC.

Nepáčilo sa mi to, tak som hľadal alternatívu a až neskôr ma napadlo, že možno to dokáže aj foobar. Prehrávač foobar2000 je jedným z najlepších prehrávačov a pre moje potreby je bezkonkurenčne najlepší. Po vložení CD som ho v prehrávači otvoril a vedľa tlačidla Play sa objavilo aj tlačidlo Rip, čo som si doteraz nevšimol. V ponuke kodekov je aj FLAC, takže stačí ho nastaviť ako treba a za pár minút je CD vo FLAC-u. A hrá presne tak ako originál.


Čo ma zaujímalo, boli rôzne úrovne kompresie. Tušil som, že súvisia s veľkosťou súboru a zaťaženia CPU, ale nevedel som ako. Spravil som si menší test kompresie. Zvolil som skladbu od The Prodigy - Out Of Space (4:58) na zistenie veľkosti súboru. Ripoval som cez všetky úrovne:

Level 0: 36,1 MB
Level 1: 34,9 MB
Level 2: 34,8 MB
Level 3: 33,4 MB
Level 4: 32,0 MB
Level 5: 32,0 MB
Level 6: 32,0 MB
Level 7: 31,9 MB
Level 8: 31,9 MB

Najvyššia kompresia od najnižšej sa líšia veľkosťou asi jednej MP3, čo v prípade celého albumu nie je zas až tak veľa. Na mojom Celerone M 1,4 Ghz sa CD oFLAC-ovalo asi za 10 minút na úrovni 2. Keby som mal veľa albumov vo FLAC-u, asi by som uvažoval o vyššej kompresií. Kvalita zvuku sa pri rôznych úrovniach nemení, len sa rôzne zaťažuje CPU.

Comments

  1. Ten kompresný pomer je dosť nízky... Okolo 40%, nie? Ogg má 90% a môj malý iPod malú pamäť :) Ale s dobrými slúchadlami a veľkým diskom by som asi volil FLAC.

    ReplyDelete
  2. Najlepší je aj tak Easy CD-DA Extractor 12 !!! ..aj na FLAC x)

    ReplyDelete

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