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"""Let's write a custom effect that will add a basic progress bar
at the bottom of our clip."""
from moviepy import VideoClip
from moviepy.decorators import requires_duration
# Here you see a decorator that will verify if our clip have a duration
# MoviePy offer a few of them that may come handy when writing your own effects
@requires_duration
def progress_bar(clip: VideoClip, color: tuple, height: int = 10):
"""
Add a progress bar at the bottom of our clip
Parameters
----------
color: Color of the bar as a RGB tuple
height: The height of the bar in pixels. Default = 10
"""
# Because we have define the filter func inside our global effect,
# it have access to global effect scope and can use clip from inside filter
def filter(get_frame, t):
progression = t / clip.duration
bar_width = int(progression * clip.w)
# Showing a progress bar is just replacing bottom pixels
# on some part of our frame
frame = get_frame(t)
frame[-height:, 0:bar_width] = color
return frame
return clip.transform(filter, apply_to="mask")
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