[英](python 3) Auto-Conversion from .h264 to .mp4
我有一个应该录制视频的 Python 3 代码。 不幸的是,我不想在 .h264 中使用它,我需要将其转换为 .mp4。 使用其他 StackOverflow 线程作为模板(特别是这个),我认为最简单的方法是使用subprocess.Popen
将MP4Box -add filename.h264 filename.mp4
插入终端并让它为我做自动地。 不幸的是,Python 脚本没有做任何事情,我也没有收到任何错误消息,所以我不知道出了什么问题。 .h264 文件出现在我想要的文件夹中,如果我手动将命令放入终端,.mp4 就会出现,但是当我让它运行时,什么也没有发生。 脚本的其余部分就像一个魅力。 代码在这里:
#!/usr/bin/python
from gpiozero import MotionSensor
from gpiozero import Motor
from picamera import PiCamera
import subprocess
import os.path
import shlex
import datetime as dt
from time import sleep
camera = PiCamera()
pir = MotionSensor(4, 1, 100, .6, False)
motor = Motor(3,14) #first number is forwards, second is backwards
startupTime = 1
recordingTime = 1
collectionTime = 3
resetTime = 30
while True:
sleep(startupTime) #delay a bit so installation can take place
#wait for motion, then move the motor back and forth
pir.wait_for_motion()
print("Motion Detected")
#moves motor forward for 3 seconds at 25% speed
motor.forward(.25)
print("Strip Extending")
sleep(3)
motor.stop()
#leaves strip out for given amount of time
print("Collecting Sample")
sleep(collectionTime)
#moves motor backward for 3 seconds at 50% speed
motor.backward(.5)
print("Strip Retracting")
sleep(3)
motor.stop()
#Prep file for correct saving
filename = dt.datetime.now().strftime("%Y-%m-%d_%H.%M.%S.h264") #saves file as a date
save_path= "/home/pi/ANALYSIS"
completed_video= os.path.join(save_path, filename)
#Start recording
camera.start_recording(completed_video) #starts recording and saves it as filename
print("Camera Recording")
camera.annotate_text = dt.datetime . now() . strftime("%Y-%m-%d_%H.%M.%S")
start=dt.datetime.now()
#Keep recording until time runs out, annotate to make sure we have reference frame
while (dt.datetime.now() - start).seconds < recordingTime:
camera.annotate_text = dt.datetime.now(). strftime("%Y-%m-%d_%H.%M.%S")
camera.wait_recording(.2)
camera.stop_recording()
#Conversion to usable file format
print("Camera finished recording... Beginning Analysis")
from subprocess import CalledProcessError
command = shlex.split("MP4Box -add {} {}.mp4".format(completed_video, os.path.splitext(filename)[0]))
try:
output = subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True)
except CalledProcessError as e:
print('FAIL:\ncmd:{}\noutput:{}'.format(e.cmd, e.output))
#starts detecting again after given time
sleep(resetTime)
print("Ready for next sample")
>Traceback (most recent call last):
>
File "/home/pi/Detector.py", line 62, in <module> output =
subprocess.check_output(command, stderr=subprocess.STDOUT)
File "/usr/lib/python3.4/subprocess.py", line 620, in check_output raise
CalledProcessError(retcode, process.args, output=output)
subprocess.CalledProcessError:
Command '['MP4Box', '-add', '2017-07-11_15.34.49.h264.h264', '2017-07-11_15.34.49.h264.mp4']'
>
Returned non-zero exit status 1"
评论:2017-07-11_15.34.49.h264.h264
您的文件路径/文件名错误,更改为以下内容:
注意:
.mp4
保存在执行子进程的当前目录中,
Python 脚本启动的目录。 这可能会有所不同,因为.h264
已保存!
考虑将其更改为绝对路径。
command = "MP4Box -add {} {}.mp4".format(completed_video, os.path.splitext(filename)[0])
try:
output = subprocess.check_output(command, stderr=subprocess.STDOUT, shell=True)
except subprocess.CalledProcessError as e:
print('FAIL:\ncmd:{}\noutput:{}'.format(e.cmd, e.output))
os.remove(路径,*,dir_fd=无)
移除(删除)文件路径。
问题:我没有收到任何错误消息,所以我不知道出了什么问题。
请尝试以下操作:
要同时捕获结果中的标准错误,请使用stderr=subprocess.STDOUT
:
command = shlex.split("MP4Box -add {f}.h264 {f}.mp4".format(f=filename))
output = subprocess.check_output(command, stderr=subprocess.STDOUT)
print(output)
我假设您需要shell=True
因为您没有提供MP4Box
的完整路径,因此需要一个 Shell 环境来查找MP4Box
。
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