GPIO 结合 OMX Player 触发时播放不同的视频
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【中文标题】GPIO 结合 OMX Player 触发时播放不同的视频【英文标题】:GPIO combine with OMX Player to play different videos when triggered 【发布时间】:2019-04-04 11:10:53 【问题描述】:我有一个简单的项目,我想结合运动传感器来播放某些视频文件。所以通常在不定式循环中,我想播放一个闪烁的视频,如果触发了运动传感器,我想停止闪烁的视频并选择一个可怕的视频。请参阅以下代码。
import RPi.GPIO as GPIO
import time
from omxplayer.player import OMXPlayer
from random import randint
#
def main():
GPIO.setmode(GPIO.BCM)
GPIO.setup(17,GPIO.IN)
flicks = ("/home/pi/halloween/flicks/tv_noise_1.mp4")
scares = ("/home/pi/halloween/scares/tv_noise_kitten_zombie_2.mp4")
omxc = OMXPlayer(flicks)
state = 0 # set initial state as 0
while True:
i = GPIO.input(17)
if(not omxc.is_playing()):
omxc = OMXPlayer(flicks)
if(state != i): # change in state detected
omxc.quit()
omxc = OMXPlayer(scares)
time.sleep(35) # wait as long as this video lasts
state = i
if __name__ == '__main__':
main()
但是,我不断收到错误消息:
Traceback (most recent call last):
File "scare_old.py", line 29, in <module>
main()
File "scare_old.py", line 20, in main
if(not omxc.is_playing()):
File "<decorator-gen-90>", line 2, in is_playing
File "/home/pi/.local/lib/python2.7/site-packages/omxplayer/player.py", line 48, in wrapped
raise OMXPlayerDeadError('Process is no longer alive, can\'t run command')
omxplayer.player.OMXPlayerDeadError: Process is no longer alive, can't run command
究竟是什么问题?我的意思是该进程应该运行,因为我之前刚刚启动它?
【问题讨论】:
【参考方案1】:import RPi.GPIO as GPIO
import time
from random import randint
from subprocess import Popen, PIPE
import os
import logging
logger = logging.getLogger(__name__)
class Player:
def __init__(self, movie):
self.movie = movie
self.process = None
def start(self):
self.stop()
self.process = Popen(['omxplayer', self.movie], stdin=PIPE,
stdout=open(os.devnull, 'r+b', 0), close_fds=True, bufsize=0)
self.process.stdin.write("b") # start playing
def stop(self):
p = self.process
if p is not None:
try:
p.stdin.write("q") # send quit command
p.terminate()
p.wait() # -> move into background thread if necessary
except EnvironmentError as e:
logger.error("can't stop %s: %s", self.movie, e)
def main():
GPIO.setmode(GPIO.BCM)
GPIO.setup(17,GPIO.IN)
first = ("/home/pi/halloween/flicks/tv_noise_no_sound_short_1.mp4")
second = ("/home/pi/halloween/scares/tv_noise_the_ring_2.mp4")
first_player = Player(movie=first)
second_player = Player(movie=second)
second_player.start()
second_player.stop()
first_player.start()
print "start the first/standard clip"
state = GPIO.input(17) # get the initial state of PIR
while True:
i = GPIO.input(17)
if((first_player.process.poll() is not None) and (second_player.process.poll() is not None)):
print "restart flickering video"
first_player.stop()
second_player.stop()
first_player.start()
if(state != i): # change in state detected
print "state has changed"
print "scaring video played"
if(second_player.process.poll() is not None):
first_player.stop()
second_player.start()
state = i
if __name__ == '__main__':
main()
【讨论】:
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