我正在创建GUI来播放视频文件。问题是，当我暂停视频时，“播放”按钮无法重新播放该视频，因此我必须再次选择视频文件。
注意：由于我想在同一tkinter窗口中显示视频，因此我不使用OpenCV imshow命令。相反，我使用的是“ window.after”方法。
以下是我的代码：
我尝试使用“ self.pause”变量来控制暂停状态。当我单击“暂停”按钮时，此布尔变量变为True。但是，当我再次单击“播放”按钮时，找不到合适的位置将其设置为“ False”。
from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
import PIL.Image, PIL.ImageTk
import cv2
class videoGUI:
def __init__(self, window, window_title):
self.window = window
self.window.title(window_title)
top_frame = Frame(self.window)
top_frame.pack(side=TOP, pady=5)
bottom_frame = Frame(self.window)
bottom_frame.pack(side=BOTTOM, pady=5)
self.pause = False # Parameter that controls pause button
self.canvas = Canvas(top_frame)
self.canvas.pack()
# Select Button
self.btn_select=Button(bottom_frame, text="Select video file", width=15, command=self.open_file)
self.btn_select.grid(row=0, column=0)
# Play Button
self.btn_play=Button(bottom_frame, text="Play", width=15, command=self.play_video)
self.btn_play.grid(row=0, column=1)
# Pause Button
self.btn_pause=Button(bottom_frame, text="Pause", width=15, command=self.pause_video)
self.btn_pause.grid(row=0, column=2)
self.delay = 15 # ms
self.window.mainloop()
def open_file(self):
self.pause = False
self.filename = filedialog.askopenfilename(title="Select file", filetypes=(("MP4 files", "*.mp4"),
("WMV files", "*.wmv"), ("AVI files", "*.avi")))
print(self.filename)
# Open the video file
self.cap = cv2.VideoCapture(self.filename)
self.width = self.cap.get(cv2.CAP_PROP_FRAME_WIDTH)
self.height = self.cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
self.canvas.config(width = self.width, height = self.height)
def get_frame(self): # get only one frame
try:
if self.cap.isOpened():
ret, frame = self.cap.read()
return (ret, cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
except:
messagebox.showerror(title='Video file not found', message='Please select a video file.')
def play_video(self):
# Get a frame from the video source, and go to the next frame automatically
ret, frame = self.get_frame()
if ret:
self.photo = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(frame))
self.canvas.create_image(0, 0, image = self.photo, anchor = NW)
if not self.pause:
self.window.after(self.delay, self.play_video)
def pause_video(self):
self.pause = True
# Release the video source when the object is destroyed
def __del__(self):
if self.cap.isOpened():
self.cap.release()
##### End Class #####
# Create a window and pass it to videoGUI Class
videoGUI(Tk(), "EnJapan")
如果我在“ play_video”函数中编写以下代码：
self.pause = False
暂停按钮不起作用。因为“ window.after”方法会自动调用“ play_video”函数，并将“ self.pause”设置为False。因此，“暂停”按钮将无效。
答案 0 :(得分：0)
我将为播放按钮回调创建另一个方法。像这样：
def play_start(self):
self.pause = False
self.play_video()
但是，我要确保您已禁用播放按钮（如果已在播放）。否则，如果多次按下播放按钮，则可能会有play_video的多个“实例”。
另一种方法是组合播放和暂停按钮，以便切换self.pause的值。然后，您可能只有一个按钮带有一个回调函数。
答案 1 :(得分：0)
问题：“暂停”按钮无效。
要为cancel的{{1}}排好队的events更改以下内容：
self.play_video答案 2 :(得分：0)
在play_video（self）方法中简单
如果self.pause == True： self.pause =假 返回
答案 3 :(得分：0)
if not self.pause:
self.window.after(self.delay, self.play_video)
else:
self.pause = False
答案 4 :(得分：-1)
from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
import PIL.Image, PIL.ImageTk
import cv2
class videoGUI:
def __init__(self, window, window_title):
self.window = window
self.window.title(window_title)
top_frame = Frame(self.window)
top_frame.pack(side=TOP, pady=5)
bottom_frame = Frame(self.window)
bottom_frame.pack(side=BOTTOM, pady=5)
self.pause = False # Parameter that controls pause button
self.canvas = Canvas(top_frame)
self.canvas.pack()
# Select Button
self.btn_select=Button(bottom_frame, text="Select video file", width=15, command=self.open_file)
self.btn_select.grid(row=0, column=0)
# Play Button
self.btn_play=Button(bottom_frame, text="Play", width=15, command=self.play_video)
self.btn_play.grid(row=0, column=1)
# Pause Button
self.btn_pause=Button(bottom_frame, text="Pause", width=15, command=self.pause_video)
self.btn_pause.grid(row=0, column=2)
# Resume Button
self.btn_resume=Button(bottom_frame, text="resume", width=15, command=self.resume_video)
self.btn_resume.grid(row=0, column=3)
self.delay = 15 # ms
self.window.mainloop()
def open_file(self):
self.pause = False
self.filename = filedialog.askopenfilename(title="Select file", filetypes=(("MP4 files", "*.mp4"),
("WMV files", "*.wmv"), ("AVI files", "*.avi")))
print(self.filename)
# Open the video file
self.cap = cv2.VideoCapture(self.filename)
self.width = self.cap.get(cv2.CAP_PROP_FRAME_WIDTH)
self.height = self.cap.get(cv2.CAP_PROP_FRAME_HEIGHT)
self.canvas.config(width = self.width, height = self.height)
def get_frame(self): # get only one frame
try:
if self.cap.isOpened():
ret, frame = self.cap.read()
return (ret, cv2.cvtColor(frame, cv2.COLOR_BGR2RGB))
except:
messagebox.showerror(title='Video file not found', message='Please select a video file.')
def play_video(self):
# Get a frame from the video source, and go to the next frame automatically
ret, frame = self.get_frame()
if ret:
self.photo = PIL.ImageTk.PhotoImage(image = PIL.Image.fromarray(frame))
self.canvas.create_image(0, 0, image = self.photo, anchor = NW)
if not self.pause:
self.window.after(self.delay, self.play_video)
def pause_video(self):
self.pause = True
#Addition
def resume_video(self):
self.pause=False
self.play_video()
# Release the video source when the object is destroyed
def __del__(self):
if self.cap.isOpened():
self.cap.release()
##### End Class #####
# Create a window and pass it to videoGUI Class
videoGUI(Tk(), "EnJapan")