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,我必须再次选择视频文件。
注意:因为我想在同一个 tkinter 窗口中显示视频,所以我不使用 OpenCV imshow 命令。相反,我使用“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,这个 bool 变量变为 True。但是,当我再次单击“播放”按钮时,我找不到合适的位置将其设为 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”函数并使“self.pause”为False。因此,暂停按钮将不起作用。
最佳答案
Question: Pause button will have no effect.
引用 :
after(delay_ms, callback=None, *args)
Registers an callback that is called after a given time.
after_cancel(id)
Cancels an callback.
致
cancel
已经排队的events
为 self.play_video
更改以下内容:def play_video(self):
...
if self.pause:
self.window.after_cancel(self.after_id)
else:
self.after_id = self.window.after(self.delay, self.play_video)
关于python - Python tkinter 的视频播放器,当我暂停视频时,我无法重新播放,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/54472997/