add example

example/viewer.py

@@ -0,0 +1,34 @@
+import pygame
+from PyDemux import Video
+
+import time
+
+
+def main():
+    width, height = -1, -1
+    screen = None
+
+    pygame.init()
+
+    video = Video.open('/Users/tee/Downloads/interview.mp4')
+
+    while 1:
+        im = video.get_frame()
+        if im is None:
+            break
+
+        if im.size != (width, height):
+            width, height = im.size
+
+            pygame.display.set_mode((width, height))
+            screen = pygame.display.get_surface()
+
+        image = pygame.image.frombuffer(im.tobytes(), im.size, "RGB")
+        screen.blit(image, (0, 0))
+        pygame.display.flip()
+
+        pygame.event.get()
+        time.sleep(1)
+
+
+main()