python - 使用 MovieStim2 在 PsychoPy 中基于按键跳过视频(循环)

Question

我在 PsychoPy 中使用 MovieStim2 播放 3 个视频。不过，我怀疑这个问题源于没有真正理解循环。

我想在参与者按下某个键时跳到下一个视频。我了解当参与者按“q”时我的代码如何退出，但我不确定如何使其在按“b”时跳到下一个视频。这是我当前的代码:

vidNum = 1
for f in ['clip1.mpg', 'clip2.mpg', 'clip3.mpg']:
    clock.reset()
    #logfile.write("AfterForLoopTime,%s,Video %s\n" % (core.getTime(), vidNum))
# Create your movie stim.
    mov = visual.MovieStim2(win, videopath+f,
                       size=640,
                       # pos specifies the /center/ of the movie stim location
                       pos=[0, 0],
                       flipVert=False,
                       flipHoriz=False,
                       ) # loop=False - need to comment this to use a loop

# Start the movie stim by preparing it to play
    shouldflip = mov.play()
    logfile.write("AfterShouldflipLine58,%s, Video %s\n" % (clock.getTime(), vidNum))
    while mov.status != visual.FINISHED:
    # Only flip when a new frame should be displayed. Can significantly reduce
    # CPU usage. This only makes sense if the movie is the only /dynamic/ stim
    # displayed.
        if shouldflip:
        # Movie has already been drawn , so just draw text stim and flip
        #text.draw()
            win.flip()
        else:
        # Give the OS a break if a flip is not needed
            time.sleep(0.001)
    # Drawn movie stim again. Updating of movie stim frames as necessary
    # is handled internally.
        shouldflip = mov.draw()

    # Check for action keys.....
        for key in event.getKeys():
            if key in ['escape', 'q']:
                win.close()
                core.quit()

我尝试添加类似于最后一个 block 的代码，该代码在 q 之后退出:

            elif key in ['b']:
                break

但我意识到我真的想打破这个循环:

for f in ['clip1.mpg', 'clip2.mpg', 'clip3.mpg']:

但是，这似乎也不起作用

for f in ['clip1.mpg', 'clip2.mpg', 'clip3.mpg']:
    for key in event.getKeys():
        if key in ['b']:
           break

Answer 1

您真正想要中断的循环是:

while mov.status != visual.FINISHED:

我能想到的最简单的方法是，如果用户按下按键，将电影状态设置为 -1 (或 visual.FINISHED)。

例如:

if key in ['b']:
    mov.status = -1

据我所知，这将使您脱离当前的视频。