Created
April 23, 2024 07:48
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Overlay a simple growing/moving progressbar on the bottom of a video using ffmpeg
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import subprocess | |
def add_progressbar_on_top_of_video( | |
input_video_filepath: str, | |
output_video_filepath: str, | |
width: int, | |
height: int, | |
duration: float, | |
fps: float = 25.0, | |
progressbar_height: int = 8, | |
progressbar_color: str = "#ffffff", | |
): | |
"""Overlay a simple filled rect progressbar moving over the screen.""" | |
px_width_per_frame: float = width / duration / fps | |
options = [ | |
"ffmpeg", | |
# First input is our original [video] | |
"-i", | |
input_video_filepath, | |
# Second input exists just to draw on it like on a [canvas]. We | |
# need to pass a color here and transparency isn't applicable, | |
# so it doesn't really matter, we'll crop it away later anyway. | |
"-f", | |
"lavfi", | |
"-i", | |
f"color=black:duration={duration}:rate={fps}:size={width}x{height}", | |
# Creation of the progressbar consists of multiple steps: | |
"-filter_complex", | |
( | |
# Assign input node aliases. | |
f""" | |
[0:v]null[video]; | |
[1:v]null[canvas]; | |
""" | |
# Draw full-width progressbar onto the canvas at the bottom. | |
f""" | |
[canvas] | |
drawbox= | |
w={width}: | |
h={progressbar_height}: | |
x=0: | |
y={height - progressbar_height}: | |
color={progressbar_color}@1.0: | |
thickness=fill | |
[progressbar]; | |
""" | |
# Crop away the black parts, which moves the progressbar to the top. | |
f""" | |
[progressbar] | |
crop= | |
w={width}: | |
h={progressbar_height}: | |
y={height - progressbar_height} | |
[progressbar]; | |
""" | |
# Overlay both, moving the progressbar back to the bottom. | |
f""" | |
[video][progressbar] | |
overlay= | |
x=-{width}+(n*{px_width_per_frame}): | |
y={height - progressbar_height}: | |
shortest=1 | |
[out] | |
""" | |
) | |
# Remove the whitespace that helped readability above, but can't | |
# be executed. | |
.replace(" ", "") | |
.replace("\n", ""), | |
"-map", | |
"[out]", | |
# Write results to disk. | |
"-y", | |
output_video_filepath, | |
] | |
subprocess.call(options, stderr=subprocess.STDOUT) | |
# add_progressbar_on_top_of_video("input_video.mp4", "output_video.mp4", 1920, 1080, duration=5) |
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