我做了一个简单的应用程序，可以使用FFMpeg转换视频文件。我用Kivy做UI。我使用os.system()来执行ffmpeg命令，但在使用这种方法时，总是会弹出一个cmd窗口。因此，我试图使用subprocess.Popen()来执行ffmpeg命令，但我也想将ffmpeg输出保存到文本文件。
我试过了，但是没有成功:
subprocess.Popen(f"ffmpeg -i {path} -acodec {acodec} {output} > output.txt 2>&1", creationflags = 0x08000000, stdout="output.txt")
FFMpeg转换视频，但没有output.txt文件。此代码适用于os.system()
我如何隐藏cmd窗口，同时保存输出到文本文件?
完整的python代码:
import os
from signal import SIGINT
import psutil
from time import sleep
from threading import Thread
from kivy.config import Config
Config.set('graphics', 'resizable', False)
Config.set('graphics', 'width', '400')
Config.set('graphics', 'height', '330')
from kivy.app import App
from kivy.uix.widget import Widget
from kivy.core.window import Window
from kivy.uix.popup import Popup
from kivy.properties import ObjectProperty
Window.clearcolor = (1, 1, 1, 1)
desktop = os.path.join(os.path.join(os.path.expanduser('~')), 'Desktop') + "\"
def cmd(command):
os.system(command)
def getpid(prcs):
for proc in psutil.process_iter():
try:
pinf = proc.as_dict(attrs=["pid", "name"])
if prcs.lower() in pinf["name"].lower():
return pinf["pid"]
except (psutil.NoSuchProcess, psutil.AccessDenied, psutil.ZombieProcess):
return False
return False
# noinspection PyGlobalUndefined
def progress(app, path):
app.root.prgrss_bar.value = 0
app.root.prgrss_lbl.text = "Progress: %0"
if not os.getcwd().endswith("ffmpeg"):
os.chdir("ffmpeg")
inputpath = app.root.label.text
if inputpath.startswith("Choose"):
return
audio = app.root.audio.state
video = app.root.video.state
both = app.root.both.state
global line1
global line2
if video == "down" or both == "down":
command = f"ffprobe -v error -select_streams v:0 -show_entries stream=nb_frames -of default=nokey=1:noprint_wrappers=1 {inputpath} > output2.txt 2>&1"
os.system(command)
ffprobe = open("output2.txt", "r")
frames = int(ffprobe.read())
control = True
while control:
sleep(0.5)
with open(path, "r") as f:
for last_line in f:
pass
line1 = last_line
sleep(0.5)
with open(path, "r") as f:
for last_line in f:
pass
line2 = last_line
if line1 == line2:
app.root.prgrss_bar.value = 100
app.root.prgrss_lbl.text = "Progress: Finished"
control = False
else:
try:
current_frame = int(line2.split("=")[1].split()[0])
percentage = int(current_frame / frames * 100)
text = f"Progress: %{percentage}"
app.root.prgrss_lbl.text = text
app.root.prgrss_bar.value = percentage
if percentage == 100:
control = False
except ValueError or TypeError:
pass
elif audio == "down":
command = f"ffprobe -v error -show_entries format=duration -of default=noprint_wrappers=1:nokey=1 {app.root.label.text} > output2.txt 2>&1"
os.system(command)
ffprobe = open("output2.txt", "r")
duration = round(float(ffprobe.read()), 2)
control = True
while control:
sleep(0.5)
with open(path, "r") as f:
for last_line in f:
pass
line1 = last_line
sleep(0.5)
with open(path, "r") as f:
for last_line in f:
pass
line2 = last_line
if line1 == line2:
app.root.prgrss_bar.value = 100
app.root.prgrss_lbl.text = "Progress: Finished"
control = False
else:
try:
current = line2.split("=")[2].split()[0].split(":")
seconds = round((int(current[0]) * 3600) + (int(current[1]) * 60) + float(current[2]), 2)
percentage = int(seconds / duration * 100)
text = f"Progress: %{percentage}"
app.root.prgrss_lbl.text = text
app.root.prgrss_bar.value = percentage
if percentage == 100:
control = False
except ValueError or TypeError:
pass
class Window(Widget):
@staticmethod
def popup_open():
popup = FolderPopup()
popup.open()
@staticmethod
def exists_open():
popup = Exists()
popup.open()
@staticmethod
def choose_open():
popup = ChooseFormat()
popup.open()
@staticmethod
def path_popup():
popup = ChoosePath()
popup.open()
@staticmethod
def unsupported_audio():
popup = UnsupportedAudio()
popup.open()
@staticmethod
def no_video_format():
popup = NoVideoFormat()
popup.open()
@staticmethod
def no_process():
popup = NoFFMPEGProcess()
popup.open()
def start(self, app):
path = app.root.label.text
if path.startswith("Choose"):
self.path_popup()
return
outname = app.root.outname.text
video_f = app.root.spinner.text
audio_f = app.root.spinner2.text
video = app.root.video.state
audio = app.root.audio.state
both = app.root.both.state
audio_supported = {"MP4": ["AAC", "MP3", "Opus"],
"MKV": ["AAC", "MP3", "Opus"],
"MOV": ["AAC", "MP3"],
"AVI": ["AAC", "MP3"],
"WMV": ["AAC", "MP3"]}
audio_ce = {"AAC": ["aac", ".m4a"],
"MP3": ["libmp3lame", ".mp3"],
"Opus": ["libopus", ".opus"],
"WAV": ["pcm_u8", ".wav"],
"Choose": ["Choose", "Choose"]}
if not os.getcwd().endswith("ffmpeg"):
os.chdir("ffmpeg")
video_ext = video_f.lower()
acodec = audio_ce[audio_f][0]
audio_ext = audio_ce[audio_f][1]
command = ""
if (video == "normal" and audio == "normal" and both == "normal") or (
video_f == "Choose" and audio_f == "Choose"):
self.choose_open()
return
elif video == "down":
if video_f == "Choose":
self.no_video_format()
return
output = f"{desktop}{outname}.{video_ext}"
if not os.path.exists(output):
command += f"ffmpeg -i {path} -an {output} > output.txt 2>&1"
else:
self.exists_open()
return
elif audio == "down":
output = f"{desktop}{outname}{audio_ext}"
if not os.path.exists(output):
command += f"ffmpeg -i {path} -vn -acodec {acodec} {output} > output.txt 2>&1"
else:
self.exists_open()
return
elif both == "down":
if video_f == "Choose":
self.no_video_format()
return
elif audio_f == "Choose":
output = f"{desktop}{outname}.{video_ext}"
if not os.path.exists(output):
command += f"ffmpeg -i {path} {output} > output.txt 2>&1"
else:
self.exists_open()
return
else:
if audio_f not in audio_supported[video_f]:
self.unsupported_audio()
return
else:
output = f"{desktop}{outname}.{video_ext}"
if not os.path.exists(output):
command += f"ffmpeg -i {path} -acodec {acodec} {output} > output.txt 2>&1"
else:
self.exists_open()
return
thrd = Thread(target=cmd, args=(command,))
thrd.start()
print("Thread started.")
def stop(self):
pid = getpid("ffmpeg")
if not pid:
self.no_process()
else:
os.kill(pid, SIGINT)
def test_open(self, app):
if not os.getcwd().endswith("ffmpeg"):
os.chdir("ffmpeg")
video = app.root.label.text
if video.startswith("Choose"):
return self.path_popup()
command = f"ffplay {video}"
os.system(command)
@staticmethod
def check_progress(app):
path = os.getcwd() + r"output.txt"
chkprgrss = Thread(target=progress, args=(app, path,))
chkprgrss.start()
class FolderPopup(Popup):
dosya = ObjectProperty(None)
desktop = desktop
@staticmethod
def no_path_submit():
popup = NoPathSubmit()
popup.open()
def buton(self, app):
try:
app.root.label.text = self.dosya.selection[0]
self.dismiss()
except:
self.no_path_submit()
class Exists(Popup):
def buton(self):
self.dismiss()
class ChooseFormat(Popup):
def buton(self):
self.dismiss()
class ChoosePath(Popup):
def buton(self):
self.dismiss()
class UnsupportedAudio(Popup):
def buton(self):
self.dismiss()
class NoVideoFormat(Popup):
def buton(self):
self.dismiss()
class NoPathSubmit(Popup):
def buton(self):
self.dismiss()
class NoFFMPEGProcess(Popup):
def buton(self):
self.dismiss()
class GUI(App):
def build(self):
return Window()
if __name__ == "__main__":
GUI().run()
一个用户发布了一个答案并删除了，但是我根据他/她的答案找到了一个解决方案。
我使用了以下代码:
with open("output.txt", "w") as output:
subprocess.run( ["ffmpeg", "-i", "video.mp4", "-acodec", "aac", "namnum.mov"], stdout=output, stderr=output, text=True, check=True, creationflags=0x08000000)