在 tkinter 中调整图像大小

Question

以下代码在 tkinter window 上播放给定的视频文件：

from tkinter import *
from PIL import ImageTk, Image
import cv2


root = Tk()
main_label = Label(root)
main_label.grid()

# Capture from camera
cap = cv2.VideoCapture("video.mp4")


# function for video streaming
def video_stream():
    ret, frame = cap.read()
    cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
    img = Image.fromarray(cv2image)
    tk_img = ImageTk.PhotoImage(image=img)
    main_label.configure(image=tk_img)
    main_label.tk_img = tk_img
    main_label.after(20, video_stream)


video_stream()
root.mainloop()

我的问题是如何调整要以 500 x 500 分辨率播放的视频？

Answer 1

首先提一个可能的问题

经常检查是否frame returns。否则您的应用程序将崩溃。

ret, frame = cap.read()
if ret:
    cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)

现在resize你的框架

# function for video streaming
ret, frame = cap.read()
if ret:
    cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
    cv2image = cv2.resize(cv2image, (500, 500))

正确代码：

from tkinter import *
from PIL import ImageTk, Image
import cv2


root = Tk()
main_label = Label(root)
main_label.grid()

# Capture from camera
cap = cv2.VideoCapture("video.mp4")


# function for video streaming
def video_stream():
    ret, frame = cap.read()
    if ret:
        cv2image = cv2.cvtColor(frame, cv2.COLOR_BGR2RGBA)
        cv2image = cv2.resize(cv2image, (500, 500))
        img = Image.fromarray(cv2image)
        tk_img = ImageTk.PhotoImage(image=img)
        main_label.configure(image=tk_img)
        main_label.tk_img = tk_img
        main_label.after(20, video_stream)


video_stream()
root.mainloop()

在 tkinter 中调整图像大小

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