**Describe the bug**
Can't hear sound [pulseaudio] and script exits with error.
**To Reproduce**
```
liquidsoap 'out(playlist("playlist.m3u"))'
```
**Output**
```
2019/05/04 15:32:46 >>> LOG START
2019/05/04 15:32:46 [main:3] Liquidsoap 1.3.7
2019/05/04 15:32:46 [main:3] Using: bytes=[distributed with OCaml 4.02 or
above] pcre=7.4.1 dtools=0.4.1 duppy=0.8.0 cry=0.6.2 mm=0.4.0 ogg=0.5.2
vorbis=0.7.1 opus=0.1.2 mad=0.4.5 flac=0.1.4 flac.ogg=0.1.4
dynlink=[distributed with Ocaml] lame=0.3.3 gstreamer=0.3.0 fdkaac=0.2.1
ffmpeg=0.2.1 samplerate=0.1.4 taglib=0.3.3 ssl=0.5.7 camomile=1.0.1 inotify=2.3
faad=0.4.0 pulseaudio=0.1.3
2019/05/04 15:32:46 [gstreamer.loader:3] Loaded GStreamer 1.16.0 0
2019/05/04 15:32:46 [frame:3] Using 44100Hz audio, 25Hz video, 44100Hz master.
2019/05/04 15:32:46 [frame:3] Frame size must be a multiple of 1764 ticks =
1764 audio samples = 1 video samples.
2019/05/04 15:32:46 [frame:3] Targetting 'frame.duration': 0.04s = 1764 audio
samples = 1764 ticks.
2019/05/04 15:32:46 [frame:3] Frames last 0.04s = 1764 audio samples = 1 video
samples = 1764 ticks.
2019/05/04 15:32:46 [threads:3] Created thread "gstreamer_main_loop" (1 total).
2019/05/04 15:32:46 [threads:3] Created thread "generic queue #1".
2019/05/04 15:32:46 [threads:3] Created thread "generic queue #2".
2019/05/04 15:32:46 [threads:3] Created thread "non-blocking queue #1".
2019/05/04 15:32:46 [threads:3] Created thread "non-blocking queue #2".
2019/05/04 15:32:46 [_playlist(dot)m3u:3] Loading playlist...
2019/05/04 15:32:46 [_playlist(dot)m3u:3] No mime type specified, trying
autodetection.
2019/05/04 15:32:46 [_playlist(dot)m3u:3] Playlist treated as format
application/x-mpegURL
2019/05/04 15:32:46 [_playlist(dot)m3u:3] Successfully loaded a playlist of 278
tracks.
2019/05/04 15:32:46 [clock.wallclock_pulse:2] Error when starting output
pulse_out(liquidsoap:): Pulseaudio error: Connection refused!
2019/05/04 15:32:46 [clock.wallclock_pulse:3] Raised by primitive operation at
file "pulseaudio.ml" (inlined), line 47, characters 6-67
2019/05/04 15:32:46 [clock.wallclock_pulse:3] Called from file
"io/pulseaudio_io.ml", line 83, characters 13-190
2019/05/04 15:32:46 [clock.wallclock_pulse:3] Called from file
"tools/start_stop.ml", line 99, characters 6-16
2019/05/04 15:32:46 [clock.wallclock_pulse:3] Called from file "clock.ml", line
237, characters 19-37
2019/05/04 15:32:46 [main:3] Shutdown started!
2019/05/04 15:32:46 [main:3] Waiting for threads to terminate...
2019/05/04 15:32:46 [threads:3] Shuting down thread gstreamer_main_loop
2019/05/04 15:32:46 [threads:3] Thread "gstreamer_main_loop" terminated (0
remaining).
2019/05/04 15:32:46 [main:3] Threads terminated.
2019/05/04 15:32:46 [threads:3] Shutting down scheduler...
2019/05/04 15:32:46 [threads:3] Thread "generic queue #2" terminated.
2019/05/04 15:32:46 [threads:3] Scheduler shut down.
2019/05/04 15:32:46 [threads:3] Shutting down queues...
2019/05/04 15:32:46 [threads:3] Thread "non-blocking queue #1" terminated.
2019/05/04 15:32:46 [threads:3] Thread "generic queue #1" terminated.
2019/05/04 15:32:46 [threads:3] Thread "non-blocking queue #2" terminated.
2019/05/04 15:32:46 [threads:3] Queues shut down
2019/05/04 15:32:46 [main:3] Cleaning downloaded files...
2019/05/04 15:32:46 [main:3] Freeing memory...
2019/05/04 15:32:46 >>> LOG END
```
**Version details**
- OS: Manjaro Linux Deepin
- Liquidsoap version: 1.3.7
**Install method**
OPAM
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