我现在正在寻找如何使用espeak宣布一个句子的方法。当我在终端时，当我输入
espeak -s 5 "where are you" --stdout | aplay
它出来了
pi@raspberrypi ~ $ espeak -s 5 "where are you" --stdout | aplay
Playing WAVE 'stdin' : Signed 16 bit Little Endian, Rate 22050 Hz, Mono
然后，如果我删除了--stdout | aplay，它就变成了：
pi@raspberrypi ~ $ espeak -s 5 "where are you"
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.front
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.rear
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.center_lfe
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.side
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround40
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround41
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround50
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround51
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.surround71
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.iec958
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.hdmi
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.modem
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm.c:2217:(snd_pcm_open_noupdate) Unknown PCM cards.pcm.phoneline
ALSA lib pcm_dmix.c:957:(snd_pcm_dmix_open) The dmix plugin supports only playback stream
Cannot connect to server socket err = No such file or directory
Cannot connect to server request channel
jack server is not running or cannot be started
然后，我意识到为了在python文件中运行它，我必须使用subprocess.call()函数
import subprocess
subprocess.call(["espeak", "-s 5 -ven", "where are you"])
上面的代码没问题。但是当我使用下面的代码时，就像地狱一样松散，并且我的屏幕上会不断出现许多奇怪的角色。
import subprocess
subprocess.call(["espeak", "-s 5 -ven", "where are you", "--stdout", "|", "aplay"])
第一个问题是--stdout | aplay实际意味着什么？
然后，如何将它放在subprocess.call中，这样它会起作用吗？原因是没有--stdout | aplay，当句子更长时，声音似乎滞后/断断续续。