Video Player By Python Tkinter, When I Pause Video, I Cannot Re-play

August 20, 2024 Post a Comment

I am creating GUI to play video files. The problem is that when I pause video, Play button cannot re-play that video, and I have to select video file again. Note: Since I want to

Solution 1:

Question: Pause button will have no effect.

Reference:

Tkinter.Widget.after-method - after(delay_ms, callback=None, *args)
Registers an callback that is called after a given time.
Tkinter.Widget.after_cancel-method - after_cancel(id)
Cancels an callback.

To cancel the allready queued events for self.play_video change the following:

defplay_video(self):
    ...

    if self.pause:
        self.window.after_cancel(self.after_id)
    else:
        self.after_id = self.window.after(self.delay, self.play_video)

Solution 2:

I would create another method for the play button callback. Something like this:

defplay_start(self):
    self.pause = False
    self.play_video()

However, I would make sure you disable the play button if it's already playing. Otherwise, you could have multiple "instances" of play_video going if the play button is pressed multiple times.

An alternative is to combine your play and pause button, so it toggles the value of self.pause. Then you could have just one button with one callback function.

Solution 3:

Simply add in the play_video(self) method:

ifself.pause == True:
    self.pause = Falsereturn

Solution 4:

if not self.pause:
    self.window.after(self.delay, self.play_video)
 else:
    self.pause = False

Solution 5:

from tkinter import *
from tkinter import messagebox
from tkinter import filedialog
import PIL.Image, PIL.ImageTk
import cv2


classvideoGUI:

    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()


    defopen_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)


    defget_frame(self):   # get only one frametry:

            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.')


    defplay_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)

        ifnot self.pause:
            self.window.after(self.delay, self.play_video)


    defpause_video(self):
        self.pause = True#Additiondefresume_video(self):
        self.pause=False
        self.play_video()


    # Release the video source when the object is destroyeddef__del__(self):
        if self.cap.isOpened():
            self.cap.release()

##### End Class ###### Create a window and pass it to videoGUI Class
videoGUI(Tk(), "EnJapan")

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