pyglet - video运行不流畅

Question

我有用python编写的代码，应该可以播放视频文件。问题是与基本播放器相比，播放的视频并不流畅。我试过实施FPS指标，但它绝对不能反映现实。请帮助任何人。

import pyglet

vidPath="video.avi"

window = pyglet.window.Window(fullscreen = False,
                              resizable = True,
                              caption = 'Video')

window.set_mouse_visible(False)

player = pyglet.media.Player()

MediaLoad = pyglet.media.load(vidPath)

player.queue(MediaLoad)

player.play()

fps_display = pyglet.clock.ClockDisplay(
    format='%(fps).1f',
    color=(0.5, 0.5, 0.5, 1)
    )


@window.event
def on_draw():
    window.clear()
    player.get_texture().blit(0,0)
    fps_display.draw()


if __name__ == '__main__':
    pyglet.app.run()

Answer 1

实际上，我在你的视频中注意到了很多学生。

我猜这是因为使用了blit()而不是draw()+window.flip()，这在更新图形缓冲区方面会更高效。

也可以将player的纹理放到pyglet.sprite.Sprite()对象中，并且纹理本身将在每一帧上更新，但更新的速率更高。

import pyglet
from pyglet.gl import *
from threading import *

# REQUIRES: AVBin
#pyglet.options['audio'] = ('alsa', 'openal', 'silent')
key = pyglet.window.key

class main(pyglet.window.Window):
    def __init__ (self):
        super(main, self).__init__(800, 800, fullscreen = False)
        self.x, self.y = 0, 0

        self.player = pyglet.media.Player()
        self.player.queue(pyglet.media.load("video.mp4"))
        self.sprites = {'video' : None}

        self.alive = 1

    def on_draw(self):
        self.render()

    def on_close(self):
        self.alive = 0

    def on_mouse_motion(self, x, y, dx, dy):
        pass

    def on_mouse_release(self, x, y, button, modifiers):
        pass

    def on_mouse_press(self, x, y, button, modifiers):
        pass

    def on_mouse_drag(self, x, y, dx, dy, button, modifiers):
        pass

    def on_key_release(self, symbol, modifiers):
        pass

    def on_key_press(self, symbol, modifiers):
        if symbol == 65307: # [ESC]
            self.alive = 0
        elif symbol == key.LCTRL:
            self.player.play()

    def render(self):
        self.clear()

        if self.player.playing:
            if self.sprites['video'] is None:
                texture = self.player.get_texture()
                if texture:
                    self.sprites['video'] = pyglet.sprite.Sprite(texture)
            else:
                self.sprites['video'].draw()

        self.flip()

    def run(self):
        while self.alive == 1:
            self.render()

            # -----------> This is key <----------
            # This is what replaces pyglet.app.run()
            # but is required for the GUI to not freeze
            #
            event = self.dispatch_events()

x = main()
x.run()

这使我的帧率提高了一倍，但是我的.mp4视频出现了一些小故障，而且我的Windows机器上也有驱动程序问题，但它比你找到的示例代码工作得更好。

Answer 2

当我在mac上用pyglet 1.2.4播放视频时，一点也不流畅。在将pyglet升级到1.5.6之后，问题就解决了，就像基本玩家一样流畅了。代码片段：

import pyglet

source = pyglet.media.load(VIDEO_FILE_PATH)
fmt = source.video_format

player = pyglet.media.Player()
player.queue(source)
player.play()

window = pyglet.window.Window(width=fmt.width, height=fmt.height)

@window.event
def on_draw():
    player.get_texture().blit(0, 0)

pyglet.app.run()

然而，pyglet 1.5.6在我的Windows 10上不起作用，视频在1.2.4版本的这台机器上运行会稍微不流畅。所以我现在最好的选择是: Mac + pyglet 1.5.6