在所有试验中无法播放MP4视频序列

Question

我有10个试验和两个条件（在试验中随机分配），其中包括播放mp4视频流电影或mp4随机流电影。要加载和播放mp4，我使用了visual.MovieStim3

nBlocks = 4
nTrials = 10

nb_conditions = np.arange(1,3) # We have two conditions : condition 1 is Optic flow and condition 2 is Random flow

conditions = nb_conditions.repeat(nTrials/2) # 5 times condition1 and 5 times condition2

conditions_rand = np.random.permutation(nb_conditions) # Randomize the order of the conditions

# --- Load optic flow and random flow movies ---

optic_flow_movie = visual.MovieStim3(win, ‘optic_flow.mp4’)
random_flow_movie = visual.MovieStim3(win, ‘random_flow.mp4’)

# --- iterate through trials and play movies---

for trialcount in range(nTrials):

   for Nframes in range(700):

       if conditions_rand[trialcount] == 1:
           optic_flow_movie.draw()


       elif conditions_rand[trialcount] == 2:
           random_flow_movie.draw()

       win.flip()
win.close()

[它开始在conditions_rand数组上播放第一个视频，然后在随机的时间间隔内，显示第二个视频，然后屏幕长时间停滞，再次变黑。因为它不会引发任何错误，所以我不知道为什么会这样。非常感谢您的帮助！

Answer 1

尝试插入：

optic_flow_movie.seek(0)
random_flow_movie.seek(0)

在两个for循环之间，因此每部电影在重新播放之前都会重置为其开始帧。