无法跨试验播放 MP4 视频序列 [英] Fail to play sequence of MP4 videos across trials

问题描述

我有 10 次试验和两个条件(在试验中随机)，包括播放光流 mp4 电影或随机流 mp4 电影.为了加载和播放 mp4，我使用了 visual.MovieStim3

I have 10 trials and two conditions (randomized across the trials) that consist of playing either an optic flow mp4 movie or a random flow mp4 movie. To load and play the mp4 I used 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()

它开始播放 conditions_rand 数组上的第一个视频，然后以随机的时间间隔播放第二个视频，然后屏幕在冻结时再次长时间黑屏.因为它不会抛出任何错误，所以我不知道它为什么会这样.非常感谢您的帮助！

It starts playing the first video on the conditions_rand array, then at a random interval of time, it shows a second video and then the screen is black again for a long time as it freezes. Because it doesn’t throw any error, I have no idea why it is behaving this way. Your help would be highly appreciated thanks !!

推荐答案

尝试插入:

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

在两个 for 循环之间，因此每部电影在再次播放之前都会重置为其开始帧.

in between the two for loops, so each movie gets reset to its start frame before getting played again.

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