闪烁的视频用于 tkinter 视频

Question

我正在尝试在tkinter中制作一个简单的播放/暂停应用程序。基本上我想显示一个视频，并在下面有一个播放/暂停按钮。

因此，经过一些研究，我找到了这个合适的帖子来展示使用 tkinter 和 opencv 的视频： 在 TKinter 中显示帧内的视频流

使用代码时，在接受的答案中给出以显示视频，没有问题，我没有看到任何闪烁。这是代码：

# import the necessary packages
from __future__ import print_function
import tkinter as tk
from PIL import ImageTk, Image
import cv2

root = tk.Tk()
# Create a frame
app = tk.Frame(root, bg="white")
app.grid()
# Create a label in the frame
lmain = tk.Label(app)
lmain.grid()
# Capture from camera
cap = cv2.VideoCapture(r'PATH_TO_VIDEO_FILE')
# function for video streaming
frame_number = 0
def video_stream(): 
global frame_number
cap.set(cv2.CAP_PROP_POS_FRAMES, frame_number)
success, frame = cap.read()
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
imgtk = ImageTk.PhotoImage(image=img)
lmain.imgtk = imgtk
lmain.configure(image=imgtk)
lmain.after(1, video_stream) 
frame_number += 1
video_stream()
root.mainloop()

现在，我稍微更改了代码，以便能够使用网格管理器并添加一个播放按钮：

# import the necessary packages
from __future__ import print_function
import tkinter as tk
from PIL import ImageTk, Image
import cv2

class PhotoBoothApp:
def __init__(self, path_to_video):
# initialize the root window
self.window = tk.Tk()
self.window.title("Video_Player")
self.videocap = cv2.VideoCapture(path_to_video)
self.frame_number = 0
# Initalize
self.videocap.set(cv2.CAP_PROP_POS_FRAMES, self.frame_number)
success, self.frame = self.videocap.read()
cv2image = cv2.cvtColor(self.frame, cv2.COLOR_BGR2RGBA)
self.img = Image.fromarray(cv2image)
self.imgtk = ImageTk.PhotoImage(image=self.img)
# Show frames
self.picture_label = tk.Label(self.window, image=self.imgtk, relief=tk.RIDGE).grid(row=0, column=0)
self.btn_next_image=tk.Button(self.window, text="Play", width=50, bg ="green",command=self.video_stream).grid(row=1,column=0)
self.window.mainloop()


def video_stream(self):
self.videocap.set(cv2.CAP_PROP_POS_FRAMES, self.frame_number)
sucess, frame = self.videocap.read()
cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
img = Image.fromarray(cv2image)
self.imgtk = ImageTk.PhotoImage(image=img)
self.picture_label = tk.Label(self.window, image=self.imgtk, relief=tk.RIDGE).grid(row=0, column=0)
# Update Frame Number to display
self.frame_number = self.frame_number + 1
self.window.after(1, self.video_stream) 

ph = PhotoBoothApp(r'PATH_TO_FILE')

问题是，当我执行上述代码时，视频闪烁，就好像 tkinter 需要在帧之间重新加载某些内容一样。我不知道为什么会这样。

附言这篇文章在这里闪烁视频在opencv-tkinter集成中对我没有帮助。

Answer 1

您需要进行两项更改：拆分self.picture_label线以创建对Label对象的正确引用，然后使用self.picure_label.config(...)更改图像。

class PhotoBoothApp:
def __init__(self, path_to_video):
# initialize the root window
...
self.picture_label = tk.Label(self.window, image=self.imgtk, relief=tk.RIDGE)
self.picture_label.grid(row=0, column=0)
...
def video_stream(self):
...
img = Image.fromarray(cv2image)
self.imgtk = ImageTk.PhotoImage(image=img)
self.picture_label.config(image=self.imgtk)
# Update Frame Number to display
self.frame_number = self.frame_number + 1
self.window.after(1, self.video_stream)
ph = PhotoBoothApp(r'PATH_TO_FILE')