Subject: Re: [linux-audio-user] cd burning w/out gaps
From: Malcolm Baldridge (linux-audio_AT_paypc.com)
Date: Fri Apr 30 2004 - 17:19:57 EEST
> so, if we don't want silence we'll have to put 00:00:00, right?
> but you say that a minimum of 1 sec is required??
I hate to add further confusion to the bonfires, but the pregap length and
silence have nothing to do with each other, per se. You can have 2 second
pre-gaps with zero inter-track silence. Casualty: your CD player's time
elapsed value will look strange around track transitions compared to a
"normal" CD mastered with P subcode bits set appropriately. Most people
seem accustomed to see the timecode "countdown" from -00:02 during two
second "pause" gaps between tracks.
Pre-gap is only silence if the P subcode flag says it is.
I will give two examples of controlling silence values in a DAO table of
contents listing:
(This is in cdrdao syntax, which resembles "professional" formats)
// Track 3
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
FILE "track3.wav"
// Track 4
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
FILE "track3.wav"
[ no silence ]
If you want silence:
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
FILE "data.wav"
// Track 4
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
SILENCE 00:02:00
FILE "data.wav"
If you want 2 seconds of silence with a 2 second "countdown" timer between
the tracks, with index points defined every minute within the track:
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
FILE "track3.wav"
// Track 4
TRACK AUDIO
NO COPY
NO PRE_EMPHASIS
TWO_CHANNEL_AUDIO
SILENCE 00:02:00
START
FILE "track4.wav"
INDEX 01:00:00
INDEX 02:00:00
INDEX 03:00:00
INDEX 04:00:00
(Yes, I know it's tempting to make a bunch of these to play some havoc with
cd-player displays.)
Incidentally, you can specify offset/length parametres to FILE to write out
only a portion of one monolithic track file, as was asked before.
Like so:
FILE "track.wav" 00:04:00 10:00:00
(dump track.wav from the 300th through the 44,999th frames, inclusive)
The pre-gap is demarcated by "INDEX 0" of the track.
You may chase me 'round the Antares maelstrom, but I shall never give up
Quality,
=MB=
-- A focus on Quality.
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