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% dtas-splitfx(1) dtas user manual
# NAME
dtas-splitfx - split audio and apply effects to all tracks
# SYNOPSIS
dtas-splitfx SPLITFX_FILE.yml [OPTIONS] [TARGETS] [ARGS...]
# DESCRIPTION
dtas-splitfx reads as YAML file and can apply effects (including
resampling/dither), split, tag, and encode files in parallel.
dtas-splitfx is intended for splitting recordings from vinyl and live
concerts into separate files. dtas-splitfx is inspired by cuesheets for
CD audio and the make(1) build tool.
dtas-splitfx primarily uses sox(1), but it is possible to define targets
to use ecasound(1), too.
# OPTIONS
-j, \--jobs [JOBS]
: Number of jobs to run in parallel. If no number is specified, all
jobs are run in parallel.
-n, \--dry-run
: Print, but do not run the commands to be executed
-s, \--quiet, \--silent
: Silent operation, commands are not printed as executed
-D, \--no-dither
: Disable automatic setting of the DITHERFX env. This also passes
the option to sox(1) via SOX_OPTS.
# FILE FORMAT
* infile - string, the pathname of the original audio file
* env - hash of environment variables to set for all commands
* comments - hash of common tags for all audio (e.g. ARTIST, ALBUM, YEAR)
comments:
ARTIST: John Smith
ALBUM: Hello World
YEAR: 2013
* track_start - integer, number to start the track count at (default: 1)
* cdda_align - boolean, enforce sector alignment for audio CDs (default: false)
* track_zpad - boolean or integer. Zero-pad the TRACKNUMBER in metadata and
filenames. If an integer, this creates a fixed padding even if the
padding is not necessary. If true, this only pads as needed for the
highest-numbered track (default: true)
* tracks - array, see "TRACKS" section
* targets - hash, see "TARGETS" section
# TRACKS
Tracks may be defined by a start time, with the stop time defined
automatically by the start of the next track, stop time, or a skip
segment.
* t TIME TITLE [fade_in/fade_out=FADE_ARGS] - the start of a new track
at TIME with TITLE. An optional fade_in and fade_out may be specified
for the first/last tracks.
* skip TIME - skip a segment starting at TIME. "skip" segments are
useful for skipping long gaps between tracks (such as flipping vinyl
or intermission at concerts)
* stop TIME - stop the last track This should be the last directive in
the "tracks" array.
An example of the tracks array for a 4 track EP follows:
tracks:
- t 0:21 "This is the first track of an EP" fade_in='t 1'
- t 7:11.6 "Second track of side A of an EP"
- skip 9:18 # this is where I flip the record, comments are allowed
- t 9:41 "3rd track of an EP"
- t 13:36.5 "Final track of the EP" fade_out='t 1'
- stop 18:11
# FADES
dtas-splitfx automatically sets up fade-in/fade-out effects for sox(1)
based on track times. These are to be used in "t" (track) directives in
the "tracks" array:
* fade_in="[TYPE] LENGTH"
* fade_out="[TYPE] LENGTH"
TYPE is optional, but LENGTH is required. See sox(1) for a description
of the fade type.
# ENVIRONMENT
dtas-splitfx sets several default environment variables for commands to
use in targets:
* INFILE - this matches the "infile" directive in the YAML file
* TRIMFX - essential, this supplys the necessary sox(1) trim effect to
each track.
* COMMENTS - expands to --comment-file=PATH for sox(1)
* OUTFMT - sox(1) arguments for the output format (e.g. "-ts32 -c2 -r44100"
* SUFFIX - the suffix of the output format without "." (e.g. "flac", "ogg")
* TRACKNUMBER - the track number, useful for comments and filenames
* RATEFX - rate effect and arguments for sox(1) resampling
* DITHERFX - dither effect and arguments for sox(1) dithering
# TARGETS
The default targets will split audio and avoid applying any effects.
They are named after common audio formats supported by sox(1):
* flac
* ogg
* mp3
* sox
If not specified, "flac" is the default target.
Additional targets supported by default.
* flac-cdda - this encodes the audio to "flac" format while being
easily decompressible to a format suitable for being burned to audio CD.
* opusenc - encodes to 16-bit, 48000 Hz Opus format using opusenc(1).
This uses sox(1) to dither/resample/apply effects as necessary.
This target exists as sox (as of v14.4.1) does not currently have
native opus encoding support.
Custom targets may easily be defined to apply effects and gain. For
example, the following "flac24" target raises the volume of the left
channel by 9.5dB and the right one by 8.5dB to compensate for channel
imbalance in a live concert recording from the audience:
targets:
flac24:
command: sox -M
"|sox $INFILE -c1 -p $TRIMFX remix 1v1 vol +9.5dB"
"|sox $INFILE -c1 -p $TRIMFX remix 2v1 vol +8.5dB"
$COMMENTS $OUTFMT
bandYYYY-MM-DD.FOO.t0"$TRACKNUMBER.$SUFFIX"
$RATEFX $DITHERFX stats
format:
type: flac
bits: 24
rate: 48000
For reference, the "opusenc" default target is implemented as follows:
targets:
opusenc:
command: sox "$INFILE" $COMMENTS $OUTFMT -
$TRIMFX $RATEFX $DITHERFX | opusenc --music
--raw-bits $BITS_PER_SAMPLE
$OPUSENC_BITRATE --raw-rate $RATE --raw-chan $CHANNELS
--raw-endianness $ENDIAN_OPUSENC
$OPUSENC_COMMENTS - $TRACKNUMBER.opus
format:
bits: 16
rate: 48000
type: s16
channels: 2
# COPYRIGHT
Copyright 2013, Eric Wong <normalperson@yhbt.net> and all contributors.\
License: GPLv3 or later <http://www.gnu.org/licenses/gpl-3.0.txt>
# SEE ALSO
sox(1), ecasound(1), flac(1), opusenc(1)
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