1998/07/09: MPEG audio layer 3
$Id: index.html,v 1.2 1998/07/10 07:09:07 itojun Exp $
おぼえがき。
- CDのインデックスをみる
% tosha -i
- CDからPCMデータを剥しとる(44.1KHz/stereo/signed 16bit/linear PCM raw)
% tosha -t 1
- PCMデータをwavに変換
% sox -t raw -r 44100 -s -w -c 2 track01.pcm hoge.wav
- wavをmpeg audio layer 3に変換
(だいたい、2分ぶんのデータで11分 on K6-166MHz)
% 8hz-mp3 hoge.wav hoge.mp3
- PC上で再生
% mpg123 hoge.mp3
- VAIO505EX(MMXPen 233MHz)で、BSDI BSD/OS 3.1上で再生すると
だいたいcpu usage 10%くらい
- kernel makeしながら再生しても特に音質差は感じない。
nice -11とかしてあるからか。
- mpmanにデータつっこむ
- ゲイツOSで書く --- 宗教上そんなことはできない
- UNIX --- まだそんなツールはない(これから書く...つもり)
参考になりそうなところ:
itojun
hack
ESD
Saturday meeting
Wednesday meeting
Yobichosa
bookshelf
comics
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diary update scanner
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places I frequently visit:
Altavista
PCWatch
comics
LPF
bookmarks
Free Mr.Kaneko! /
[六ヶ所村問題]
[software patent]
[共謀法反対]
Unauthorized reproduction is strictly prohibited unless specially noted.
If you have problem reading the text (KSC5601 with ctext/iso-2022-jp-2
encoding) use
w3m-m17n or mozilla.