Skip to main content

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

Post a Comment

Popular posts from this blog

Windows 7 RC Ultimate on HP Compaq nx6110

I have never tried Vista on my laptop, because it is well suited for WinXP and I don't like Vista. But what if you can download the new Win 7 RC for free?

I'm using Windows XP since I have bought my old laptop HP Compaq nx6110 (1,4 Ghz Celeron M, 768 MB RAM). WinXP runs on this laptop really fast and smoothly, but I have turned every "eyecandy" off and it looks like old Win95 now. But I like this neutral look.

Last week I was closed in my room for two days installing and trying different Linux distributions. After this time I ended with Arch Linux installed on my hard drive - system was stable and either WiFi worked well. Then I realized, that I have spent so much time and done nothing useful. So I decided to work with WinXP and don't bother with other OS (like 2 weeks with Mac OS X a month ago).

But NO. Incidentally I got to this website and started immediately download the iso image. The download process ran in Java and I had download speed about 800 KB/s, that…

Additional RAM to iMac and installation of some software and games

RAM upgrade

After Mac OS 9 updates I started to use this system. But after a short while I realized that I really need more RAM. It was almost impossible to work with more than one application. Therefore I was decided to buy 512 MB RAM.

I knew about one small shop with old computers on Favoritenstrasse (U6: between Taubstummengasse and Südtiroler Platz). I went there and asked about SDRAM PC100. Old but nice guy showed me some 512 MB modules for about 30 €. I didn't have so much money with me at that moment and I also wanted to visit that Mac shop once more. So I left the shop and forgot my umbrella there.

That Mac shop offered me the same kind of RAM for about 45-50 €. Hmm, .... No thanks. I went to my room and picked some money from bankomat. I returned to the computer shop and the seller offered me (except my umbrella - for free of course) one module for 24 €. It has not been tested yet. I have bought it and put in my iMac - and nothing happened. Bad, but I had to go to the school…

Yamaha S08 - sticky keys repair

My keyboard Yamaha S08 suffered from several "sticky keys" disease already a year, perhaps more. That saying, I am pretty bad piano player. However, I like to have my devices fully functional for any cases.
I have found a very helpful guide, but with no photos. I made some for better visualization of the repair.
First, I unfastened all screws from both sides:

Second, I unfastened all screws from a wooden base plate which were holding the part with electronics.


Then I unfastened the golden screws holding the whole keyboard to the wood. The keyboard was now accessible from both sides.

The last step is described in the following video. It was just removing the sticky keys and reinserting them without a metal spring coming inside. The end of the metal spring has been left outside of the key:


So far it works well!