Почитал темы на форуме про mplayer - не нашёл решения для моего случая. Воспроизводится только музыка!
Если я mplayer запускаю из консоли, то всё ок, пашет.
georgy@DepoEgoV04:~$ sudo mplayer test.mp3
MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing test.mp3.
Detected file format: MPEG audio layer 2/3 (libavformat)
[mp3 @ 0x1f37900]max_analyze_duration reached
[mp3 @ 0x1f37900]Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: audio (mp3), -aid 0
Clip info:
album: Mr. & Mrs. Smith
artist: Joe Strummer
genre: Soundtrack
title: Mondo Bongo
track: 6
date: 2005
Load subtitles in .
==========================================================================
Requested audio codec family [mpg123] (afm=mpg123) not available.
Enable it at compilation.
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, floatle, 320.0 kbit/10.42% (ratio: 40000->384000)
Selected audio codec: [ffmp3float] afm: ffmpeg (FFmpeg MPEG layer-3 audio)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file or directory
AO: [alsa] 48000Hz 2ch floatle (4 bytes per sample)
Video: no video
Starting playback...
A: 373.1 (06:13.1) of 373.4 (06:13.4) 1.2%
[mp3float @ 0x15a8920]incomplete frame
A: 373.2 (06:13.2) of 373.4 (06:13.4) 1.2%

Если делаю небольшой скрипт
test, то так же небольшая нагрузка
#!/bin/bash
# Код скрипта test
mplayer /home/georgy/test.mp3
exit 0
georgy@DepoEgoV04:~$ sudo bash test
MPlayer2 UNKNOWN (C) 2000-2011 MPlayer Team
mplayer: could not connect to socket
mplayer: No such file or directory
Failed to open LIRC support. You will not be able to use your remote control.
Playing /home/georgy/test.mp3.
Detected file format: MPEG audio layer 2/3 (libavformat)
[mp3 @ 0x4765900]max_analyze_duration reached
[mp3 @ 0x4765900]Estimating duration from bitrate, this may be inaccurate
[lavf] stream 0: audio (mp3), -aid 0
Clip info:
album: Mr. & Mrs. Smith
artist: Joe Strummer
genre: Soundtrack
title: Mondo Bongo
track: 6
date: 2005
Load subtitles in /home/georgy/
==========================================================================
Requested audio codec family [mpg123] (afm=mpg123) not available.
Enable it at compilation.
Opening audio decoder: [ffmpeg] FFmpeg/libavcodec audio decoders
AUDIO: 48000 Hz, 2 ch, floatle, 320.0 kbit/10.42% (ratio: 40000->384000)
Selected audio codec: [ffmp3float] afm: ffmpeg (FFmpeg MPEG layer-3 audio)
==========================================================================
[AO OSS] audio_setup: Can't open audio device /dev/dsp: No such file or directory
AO: [alsa] 48000Hz 2ch floatle (4 bytes per sample)
Video: no video
Starting playback...
A: 299.4 (04:59.3) of 373.4 (06:13.4) 1.1%

Если же я добавляю плейер в крон, то загрузка проца идёт большая.
crontab -e
@reboot mplayer /home/georgy/test.mp3
И такой же негативный результат, если из крона запустить:
crontab -e
@reboot bash /home/georgy/test
Необходимо минимизировать нагрузку на проц, чтоб не грелся зря. Что подскажите?
P.S.: В идеале скрипт
test может периодически активироваться и выключаться.