在 Raspberry Pi 上使用 crontab 无法播放音频 [英] Audio doesn't play with crontab on Raspberry Pi

问题描述

我正在尝试让当前连接到蓝牙扬声器的 Raspberry Pi 每天按计划播放音频文件，其中我的 cron 作业正在更新 @daily 获得新的时间(基本上是祈祷的召唤)

I'm trying to get my Raspberry Pi which is currently connect to a bluetooth speaker to play an audio file daily on a schedule basis where my cron job is being update @daily to get new timing (It's basically a call to prayer)

crontab -l

@daily /home/pi/athan/update_prayers.sh
39 05 27 2 * /home/pi/athan/call_prayer.sh >/dev/null 2>&1 #fajr
31 12 27 2 * /home/pi/athan/call_prayer.sh >/dev/null 2>&1 #dhuhr
34 15 27 2 * /home/pi/athan/call_prayer.sh >/dev/null 2>&1 #asr
05 18 27 2 * /home/pi/athan/call_prayer.sh >/dev/null 2>&1 #maghrib
24 19 27 2 * /home/pi/athan/call_prayer.sh >/dev/null 2>&1 #isha

所以，以上就是我现在所拥有的，这是/home/pi/athan/update_prayers.sh

So, the above is what I have right now and this is the content of /home/pi/athan/update_prayers.sh

#!/bin/bash
/home/pi/.nvm/versions/node/v7.5.0/bin/node /home/pi/athan/set_prayer.js

基本上我的 set_prayer.js 只是使用这个 https://www.npmjs.com/package/crontab 模块来设置 crontab，我能够每天更新它，这里没有问题.现在我正在使用 Mplayer 播放音频，这是我使用的命令:

Basically my set_prayer.js is just using this https://www.npmjs.com/package/crontab module to set crontab and I was able to get it update daily no problem here. Right now I'm using Mplayer to play the audio and this is the command I use:

/home/pi/athan/call_prayer.sh

#!/bin/bash
/usr/bin/mplayer /home/pi/athan/athan.mp3

我的问题是，在运行 cron 作业时没有声音，或者我什至不知道作业是否正在运行，但是当我手动执行时，我可以听到正在播放的音频没有问题.我还尝试使用 /usr/bin/omxplayer -o alsa/home/pi/athan/athan.mp3 直接在此处运行它，而不是运行 bash 脚本，但它似乎不起作用使用 cron 但当我直接运行命令时工作正常.

My problem here is that when it's time for the cron job to run there's no sound or I don't even know if the job is being run, but when I do it manually I can hear the audio being played no problem. I've also tried to run it directly here using /usr/bin/omxplayer -o alsa /home/pi/athan/athan.mp3 instead of running bash script and it doesn't seem to work with cron but works fine when I run the command directly.

推荐答案

我遇到了类似的问题(如果从 crontab 运行命令，则蓝牙扬声器上没有音频.

I was struggling with a similar problem (no audio on Bluetooth speaker if the command is run from crontab.

问题在于混合pulseaudio/crontab和环境设置.

The problem was the mix pulseaudio/crontab and the environment setup.

以下解决方案对我有用:https://wiki.archlinux.org/index.php/PulseAudio#Play_sound_from_a_non-interactive_shell_.28systemd_service.2C_cron.29

The following solution worked for me: https://wiki.archlinux.org/index.php/PulseAudio#Play_sound_from_a_non-interactive_shell_.28systemd_service.2C_cron.29

所以基本上只需执行 crontab -e 并添加以下内容:

so basically just do crontab -e and add the following:

XDG_RUNTIME_DIR=/run/user/user_id

可以通过以下命令找到用户ID:

the user id can be found out by the following command:

id [user_name]

这篇关于在 Raspberry Pi 上使用 crontab 无法播放音频的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！