#580 Code to Control an MP4, including Navigation within a 360-Degree Movie
#580 Code to Control an MP4, including Navigation within a 360-Degree Movie
#580 Provide example code to control the playback of an MP4 file. Support: Load, Play, Pause, Set Speed, Play backwards and Play from time position.
To control the playback of an MP4 file in code, you can use a media framework such as ffmpeg or a media player library such as libVLC. Here's an example using libVLC in Python:
import vlc
# load the media file
media = vlc.MediaPlayer("path/to/file.mp4")
# play the media file
media.play()
# pause the media file
media.pause()
# set the playback speed to 1.5x
media.set_rate(1.5)
# play the media file backwards
media.set_rate(-1)
# play the media file from a specific time position (in milliseconds)
media.set_time(5000)
media.play()
Note that in order to use libVLC, you will need to have the vlc library installed on your system. You can install it via your package manager or download it from the official website: https://www.videolan.org/vlc/libvlc.html
Repeat this using a different library
Here's an example using the moviepy library in Python:
from moviepy.editor import VideoFileClip
# load the media file
clip = VideoFileClip("path/to/file.mp4")
# play the media file
clip.preview()
# pause the media file
clip.preview(pause=True)
# set the playback speed to 1.5x
clip.preview(fps=clip.fps*1.5)
# play the media file backwards
clip.preview(reverse=True)
# play the media file from a specific time position (in seconds)
clip.preview(start_time=5)
Note that in order to use moviepy, you will need to install it via pip: pip install moviepy. Also, note that moviepy does not have native support for changing the playback speed or playing the video backwards, so we're using workarounds here by adjusting the frames per second and playing the video in reverse.
Provide sample python code to provide a GUI to control the MP4 thru real-time feedback from the user while the MP4 is playing.
Here's an example Python code using the tkinter library to create a GUI for controlling an MP4 file with real-time feedback:
import tkinter as tk
import vlc
class MP4Player:
def __init__(self, master, file_path):
self.instance = vlc.Instance()
self.player = self.instance.media_player_new()
self.media = self.instance.media_new(file_path)
self.player.set_media(self.media)
self.canvas = tk.Canvas(master, width=640, height=360)
self.canvas.pack()
self.canvas.bind("<Button-1>", self.on_canvas_click)
self.play_button = tk.Button(master, text="Play", command=self.play)
self.play_button.pack(side="left")
self.pause_button = tk.Button(master, text="Pause", command=self.pause)
self.pause_button.pack(side="left")
self.slider = tk.Scale(master, from_=0, to=self.media.get_duration(), orient="horizontal", command=self.set_time)
self.slider.pack()
self.speed_label = tk.Label(master, text="Speed:")
self.speed_label.pack(side="left")
self.speed_scale = tk.Scale(master, from_=0.5, to=2, resolution=0.1, orient="horizontal", command=self.set_speed)
self.speed_scale.pack(side="left")
self.time_label = tk.Label(master, text="Time:")
self.time_label.pack(side="left")
self.time_var = tk.StringVar()
self.time_var.set("0:00 / " + self.format_time(self.media.get_duration()))
self.time_label_val = tk.Label(master, textvariable=self.time_var)
self.time_label_val.pack(side="left")
self.update()
def play(self):
self.player.play()
def pause(self):
self.player.pause()
def set_time(self, value):
self.player.set_time(int(value * 1000))
def set_speed(self, value):
self.player.set_rate(float(value))
def on_canvas_click(self, event):
self.set_time(event.x / 640 * self.media.get_duration())
def update(self):
self.slider.set(self.player.get_time() / 1000)
self.time_var.set(self.format_time(self.player.get_time() // 1000) + " / " + self.format_time(self.media.get_duration()))
self.canvas.after(50, self.update)
def format_time(self, seconds):
return "{:d}:{:02d}".format(int(seconds // 60), int(seconds % 60))
root = tk.Tk()
player = MP4Player(root, "path/to/file.mp4")
root.mainloop()
This code creates a simple GUI with a canvas for displaying the video, buttons for play and pause, a slider for seeking, a speed control slider, and a time display. The canvas is also used to provide real-time feedback by seeking the video when the user clicks on it.
Note that this code uses the vlc library, so you will need to have it installed on your system. Also, note that this code only works for playing a single MP4 file at a time. If you want to support playing multiple files, you will need to modify the code accordingly.
What additional code would be needed to "navigate" within a 360-degree video (MP4), to look around at the movie plays?
To navigate within a 360-degree video and look around as the video plays, you would need to use a library that supports 360-degree video playback, such as KivyMD. Here's an example code that adds 360-degree video playback and navigation to the MP4Player class I provided earlier:
import kivymd
from kivy.uix.video import Video
class MP4Player:
def __init__(self, master, file_path):
self.instance = vlc.Instance("--vout=opengl")
self.player = self.instance.media_player_new()
self.media = self.instance.media_new(file_path)
self.player.set_media(self.media)
self.canvas = Video(source=file_path, state="play")
self.canvas.state = "stop"
self.canvas.options = {'eos': 'loop'}
self.canvas.pos = (0, 0)
self.canvas.size = (640, 360)
master.add_widget(self.canvas)
self.play_button = tk.Button(master, text="Play", command=self.play)
self.play_button.pack(side="left")
self.pause_button = tk.Button(master, text="Pause", command=self.pause)
self.pause_button.pack(side="left")
self.slider = tk.Scale(master, from_=0, to=self.media.get_duration(), orient="horizontal", command=self.set_time)
self.slider.pack()
self.speed_label = tk.Label(master, text="Speed:")
self.speed_label.pack(side="left")
self.speed_scale = tk.Scale(master, from_=0.5, to=2, resolution=0.1, orient="horizontal", command=self.set_speed)
self.speed_scale.pack(side="left")
self.time_label = tk.Label(master, text="Time:")
self.time_label.pack(side="left")
self.time_var = tk.StringVar()
self.time_var.set("0:00 / " + self.format_time(self.media.get_duration()))
self.time_label_val = tk.Label(master, textvariable=self.time_var)
self.time_label_val.pack(side="left")
self.update()
def play(self):
self.player.play()
self.canvas.state = "play"
def pause(self):
self.player.pause()
self.canvas.state = "pause"
def set_time(self, value):
self.player.set_time(int(value * 1000))
self.canvas.seek(self.canvas.duration * (int(value) / self.media.get_duration()))
def set_speed(self, value):
self.player.set_rate(float(value))
self.canvas.speed = float(value)
def on_canvas_click(self, event):
pass
def update(self):
self.slider.set(self.player.get_time() / 1000)
self.time_var.set(self.format_time(self.player.get_time() // 1000) + " / " + self.format_time(self.media.get_duration()))
self.canvas.seek(self.canvas.duration * (self.player.get_time() / self.media.get_duration()))
self.canvas.texture = self.canvas._video.texture
self.canvas.texture.flip_vertical()
self.canvas.texture.wrap = kivymd.material_resources.get_path_to_data_dir() + 'image/uvgrid.png'
self.canvas.texture.uvpos = (self.canvas.texture.uvpos[0] - 0.05, self.canvas.texture.uvpos[1])
self.canvas.texture.uvsize = (self.canvas.texture.uvsize[0] + 0.1, self.canvas.texture.uvsize[1])
self.canvas.texture.uvsize = (self.canvas.texture.uvsize[0] % 1, self.canvas.texture.uvsize[1])
Continue where you left off
In the code I provided earlier, I added the KivyMD library to enable 360-degree video playback and navigation. Here's what the changes in the MP4Player class mean:
- I added the kivymd import at the top of the file.
- I added the Video import from kivy.uix.video.
- I changed the self.canvas initialization to create a Video widget instead of a Canvas. I passed the file_path as the source parameter and set the state to "stop".
- I added the options parameter to the self.canvas initialization to set the eos (end of stream) option to "loop". This allows the video to loop indefinitely when it reaches the end.
- I added the on_canvas_click method, which is called when the user clicks on the canvas. In this method, we could use the self.canvas.seek() method to navigate within the video, but for a 360-degree video, we want to use a different method.
- I updated the play and pause methods to also start and stop the video playback in the self.canvas widget.
- I updated the set_time method to seek within the video using the self.canvas.seek() method, which takes a value between 0 and 1 representing the position within the video as a fraction of the total duration. To calculate this value, we divide the current time position by the total duration of the media file.
- I updated the set_speed method to set the playback speed of the self.canvas widget using the self.canvas.speed property. This property takes a value between 0 and 2, where 1 is the normal playback speed.
- I updated the update method to update the texture of the self.canvas widget with the current video frame, using the _video.texture property. I also added some code to enable 360-degree navigation, by adjusting the texture's uvpos and uvsize properties.
Note that this code assumes that the 360-degree video is in equirectangular format, where the video frames are mapped onto a rectangular surface. If your video is in a different format, you may need to use a different method for navigation.
Also note that this code requires Kivy and KivyMD to be installed. You can install them via pip: pip install kivy kivymd.
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