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This page outlines some best practices; however, we advise to always consult a TSG member if you plan to run a video experiment in the labs.
This page outlines some best practices; however, we advise to always consult a TSG member if you plan to run a video experiment in the labs.
==Video playback==
=== Python ===
Example demonstrating how to play a video with audio:
<syntaxhighlight lang="python" line>
from psychopy import logging, prefs
logging.console.setLevel(logging.WARNING)
prefs.hardware['audioLib'] = ['PTB']
prefs.hardware['audioLatencyMode'] = 2
from psychopy import visual, core, event
from psychopy.hardware import keyboard
# File paths for video and audio
video_file = "tick_rhythm_combined_30min.mp4"
win = visual.Window(size=(1024, 768), fullscr=False, color=(0, 0, 0))
video = visual.VlcMovieStim(
win, filename=video_file,
autoStart= False
)
kb = keyboard.Keyboard()
# Play the video
win.flip()
core.wait(3.0)
video.play()
video_start_time = core.getTime()
# Main loop for video playback
while video.status != visual.FINISHED:
# Draw the current video frame
video.draw()
win.flip()
keys = kb.getKeys(['q'], waitRelease=True)
if 'q' in keys:
break
win.close()
core.quit()
</syntaxhighlight>
Example demonstrating how to play a video with audio disconected:
<syntaxhighlight lang="python" line>
from psychopy import logging, prefs
logging.console.setLevel(logging.DEBUG)
from psychopy import visual, core, sound, event
import time
prefs.hardware['audioLib'] = ['PTB']
prefs.hardware['audioLatencyMode'] = 2
# File paths for video and audio
video_file = "tick_rhythm_30min.mp4"
audio_file = "tick_rhythm_30min.wav"
win = visual.Window(size=(1280, 720), fullscr=False, color=(0, 0, 0), units="pix")
video = visual.VlcMovieStim(
win, filename=video_file,
size=None, # Use the native video size
pos=[0, 0], # Center of the window
flipVert=False,
flipHoriz=False,
loop=False,
autoStart=False,
noAudio=True,
volume=100,
name='myMovie'
)
# Load the audio
audio = sound.Sound(audio_file, -1)
# Synchronize audio and video playback
win.flip()
time.sleep(5)
audio.play()
time.sleep(0.04)
video.play()
video_start_time = core.getTime()
while video.status != visual.FINISHED:
# Draw the current video frame
video.draw()
win.flip()
# Check for keypress to quit
if "q" in event.getKeys():
audio.stop()
break
# Close the PsychoPy window
win.close()
core.quit()
</syntaxhighlight>
==Video encoding==
==Video encoding==