Video property control

This shows how to control various properties of a video file in expyfun.

@author: drmccloy

exp_name: advanced video example
date: 2024-11-19 15_32_45.879654
file: /home/circleci/project/examples/stimuli/advanced_video.py
participant: foo
session: foo
2024-11-19 15:32:45,879 - INFO    - Expyfun: Using version 2.0.0.dev0 (requested dev)
2024-11-19 15:32:45,880 - INFO    - Expyfun: Setting up sound card using pyglet backend with 2 playback channels
2024-11-19 15:32:46,033 - WARNING - Expyfun: Mismatch between reported stim sample rate (24414) and device sample rate (44100.0). Experiment Controller will resample for you, but this takes a non-trivial amount of processing time and may compromise your experimental timing and/or cause artifacts.
2024-11-19 15:32:46,033 - INFO    - Expyfun: Setting up screen
2024-11-19 15:32:46,064 - EXP     - Expyfun: Set screen visibility True
2024-11-19 15:32:46,073 - INFO    - Initialized [720 480] window on screen XlibScreen(display=<pyglet.canvas.xlib.XlibDisplay object at 0x7f25553adba0>, x=0, y=0, width=1400, height=900, xinerama=0) with DPI 69.73
2024-11-19 15:32:46,073 - INFO    - Expyfun: Initializing dummy triggering mode
2024-11-19 15:32:46,074 - INFO    - Expyfun: Initialization complete
2024-11-19 15:32:46,074 - EXP     - Expyfun: Participant: foo
2024-11-19 15:32:46,074 - EXP     - Expyfun: Session: foo
2024-11-19 15:32:48,196 - INFO    - Expyfun: Exiting
2024-11-19 15:32:48,203 - EXP     - Expyfun: Audio stopped and reset.

import numpy as np

from expyfun import (
    ExperimentController,
    building_doc,
    fetch_data_file,
    visual,
)
from expyfun import (
    analyze as ea,
)

print(__doc__)


movie_path = fetch_data_file("video/example-video.mp4")

ec_args = dict(
    exp_name="advanced video example",
    window_size=(720, 480),
    full_screen=False,
    participant="foo",
    session="foo",
    version="dev",
    output_dir=None,
)
colors = [x for x in "rgbcmyk"]

with ExperimentController(**ec_args) as ec:
    screen_period = 1.0 / ec.estimate_screen_fs()
    all_presses = list()
    fix = visual.FixationDot(ec)
    text = text = visual.Text(ec, "Running ...", (0, -0.1), "k")
    screenshot = None  # don't have one yet
    ec.load_video(movie_path)
    ec.video.set_scale("fill")
    ec.screen_prompt("press 1 during video to toggle pause.", max_wait=1.0)
    ec.listen_presses()  # to catch presses on first pass of while loop
    t_zero = ec.video.play(auto_draw=False)
    this_sec = 0.0
    while not ec.video.finished:
        if ec.video.playing:
            ec.video.draw()
        else:
            ec.screen_text("paused!", color="y", font_size=32, wrap=False)
        text.draw()
        fix.draw()
        if screenshot is None:
            screenshot = ec.screenshot()
        fliptime = ec.flip()
        presses = ec.get_presses(live_keys=[1], relative_to=t_zero)
        ec.listen_presses()
        # change the background color every 1 second
        if this_sec != int(ec.video.time):
            this_sec = int(ec.video.time)
            text = visual.Text(ec, str(colors[this_sec]), (0, -0.1), "k")
            ec.set_background_color(colors[this_sec])
        # shrink the video, then move it rightward
        if ec.video.playing:
            if 1 < ec.video.time < 3:
                ec.video.set_scale(ec.video.scale * 0.99)
            if 4 < ec.video.time < 5:
                ec.video.set_pos(ec.video.position + np.array((0.01, 0)))
        # parse button presses
        if len(presses):
            all_presses.extend(presses)
            if len(presses) % 2:  # if even number of presses, do nothing
                if ec.video.playing:
                    ec.video.pause()
                else:
                    ec.video.play(auto_draw=False)
        if building_doc:
            break
    ec.delete_video()
    preamble = "press times:" if len(all_presses) else "no presses"
    msg = ", ".join([f"{x[1]:.3f}" for x in all_presses])
    ec.flip()
    ec.screen_prompt("\n".join([preamble, msg]), max_wait=1.0)

ea.plot_screen(screenshot)