gistfile1.py

from kivy.graphics.fbo import Fbo
from kivy.graphics import Rectangle, Color
from kivy.core.gl import glReadPixels, GL_RGBA, GL_UNSIGNED_BYTE
import pygame

def save_texture(texture, filename):
    fbo = Fbo(size=texture.size)
    fbo.add(Color(1, 1, 1))
    fbo.add(Rectangle(size=texture.size, texture=texture))
    fbo.draw()
    fbo.bind()
    w, h = texture.size
    data = glReadPixels(0, 0, w, h, GL_RGBA, GL_UNSIGNED_BYTE)
    fbo.release()

    pixels = pygame.image.fromstring(data, texture.size, 'RGBA', True)
    image = pygame.Surface(texture.size, depth=24)
    image.blit(pixels, (0, 0))
    pygame.image.save(image, filename)


if __name__ == '__main__':

    import sys
    from kivy.uix.video import Video
    from kivy.base import runTouchApp
    from kivy.clock import Clock

    video = None

    def save_video_image(dt):
        save_texture(video.texture, 'test.png')
        sys.exit(0)

    Clock.schedule_once(save_video_image, 3)

    video = Video(source=sys.argv[1], play=True)
    runTouchApp(video)