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% dtas-player(1) dtas user manual
%
# NAME
dtas-player - playback process for dtas
# SYNOPSYS
dtas-player
# DESCRIPTION
dtas-player is intended as a music player, but implemented as Unix
process and pipeline manager, so it may run arbitrary commands and route
data to just about any process.
dtas-player is currently only queue-based, enqueued tracks are played
only once. It only runs in a foreground console, so usage with
screen(1) or tmux(1) is recommended.
By default, dtas-player uses the sox(1) command to decode audio, and
pipes the data to a play(1) process (also distributed with sox). It may
be configured to output to multiple/arbitrary processes, and may invoke
arbitrary commands for outputting audio (or any other data).
dtas-player is controlled by a Unix socket, see dtas-player_protocol(7)
for details. Given the power of dtas-player to run arbitrary commands,
this socket is created with restricted permissions and is only
accessible by the user who invoked dtas-player.
dtas-player maintains state across restarts with a state file.
# EXAMPLE
Starting dtas-player is easy, it takes no arguments:
$ dtas-player
In a different terminal, enqueue your favorite track for playback:
$ dtas-enq /path/to/your/favorite/music.flac
In the terminal running dtas-player, some diagnostic information
should be printed, as will any errors which occur.
To see information about the currently playing track in YAML:
$ dtas-ctl current
As you should be able to see, a "default" sink is automatically
created and playing the audio.
# TROUBLESHOOTING
## Audio playback does not start
The most common problem with dtas-player is the play(1) command
(distributed with SoX) not using the correct audio device/driver.
Ensuring the play(1) command works with dtas-player is important.
Consult SoX documentation and mailing lists for getting play(1) to work,
first.
Once you find the correct AUDIODEV/AUDIODRIVER environment variables,
you may set them via dtas-ctl(1):
To play audio on my favorite USB DAC directly to ALSA, I use:
$ dtas-ctl sink ed default env.AUDIODEV=hw:DAC env.AUDIODRIVER=alsa
## Seeking/playing audio from large video containers (e.g. VOB) fails
This is a problem with large VOBs. We recommend breaking up the
VOB into smaller files or using avconv(1) or ffmpeg(1) to extract
the desired audio stream.
avconv -analyzeduration 2G -probesize 2G \
-i input.vob -vn -sn -c:a copy -map 0:$STREAM_NR output.ext
# ADVANCED EXAMPLES
See dtas_player-sink_examples(7) for more sink examples.
# ENVIRONMENT
DTAS_PLAYER_SOCK - the path to the dtas-player listen socket.
This defaults to ~/.dtas/player.sock
DTAS_PLAYER_STATE - the state file of the dtas-player
This defaults to ~/.dtas/player_state.yml
dtas-player will automatically populate $SOXFMT and $ECAFMT when
invoking sink and source commands.
ReplayGain values are also exported to the source command if they
exist in the source file:
* REPLAYGAIN_TRACK_GAIN
* REPLAYGAIN_ALBUM_GAIN
* REPLAYGAIN_ALBUM_PEAK
* REPLAYGAIN_TRACK_PEAK
# FILES
~/.dtas/player_state.yml is a human-readable YAML file used to preserve
state across restarts of dtas-player.
# CONTACT
All feedback welcome via plain-text mail to: <dtas-all@nongnu.org>\
Mailing list archives available at <http://80x24.org/dtas-all/> and
<ftp://lists.gnu.org/dtas-all/>\
No subscription is necessary to post to the mailing list.
# COPYRIGHT
Copyright 2013-2016 all contributors <dtas-all@nongnu.org>.\
License: GPL-3.0+ <http://www.gnu.org/licenses/gpl-3.0.txt>
# SEE ALSO
dtas-player_protocol(7), dtas-ctl(1), dtas-enq(1), dtas-sourceedit(1),
dtas-sinkedit(1), sox(1), play(1), avconv(1), ffmpeg(1), screen(1), tmux(1)
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