How to add a headline bar with Claude

Add a headline bar to input.mp4: a solid black band across the top of the frame with "POV: you finally found a serum that works" in white bold, centered and wrapped to fit, on screen the whole time. Use Python with Pillow to draw it and ffmpeg to put it on the video (don't rely on ffmpeg's drawtext filter), keep the audio, and save it as output.mp4.

#!/usr/bin/env python3
"""Headline bar: a solid black band across the top of the frame with a white headline in it, on screen the whole time.

Usage: python3 headline-bar.py input.mp4 output.mp4
Needs ffmpeg and Pillow (pip install pillow).
"""
import json
import math
import subprocess
import sys
from pathlib import Path

from PIL import Image, ImageDraw, ImageFont

TEXT = "POV: you finally found a serum that works"
SIZE = 0.06          # text height as a share of the frame width
PAD = 0.04           # space around the text, as a share of the frame width
FONTS = ["/System/Library/Fonts/Supplemental/Arial Bold.ttf",     # macOS
         "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",  # Linux
         "C:/Windows/Fonts/arialbd.ttf"]                          # Windows
FONT_FILE = next((f for f in FONTS if Path(f).exists()), None) or sys.exit("No bold font found: add one to FONTS")



def wrap(text, font, width):
    lines, line = [], ""
    for word in text.split():
        trial = f"{line} {word}".strip()
        if font.getlength(trial) <= width or not line:
            line = trial
        else:
            lines.append(line)
            line = word
    return lines + [line]


def bar():
    font = ImageFont.truetype(FONT_FILE, round(w * SIZE))
    pad = round(w * PAD)
    lines = wrap(TEXT, font, w - 2 * pad)
    step = round(font.size * 1.25)
    img = Image.new("RGBA", (w, 2 * pad + step * len(lines)), "black")
    draw = ImageDraw.Draw(img)
    for i, line in enumerate(lines):
        draw.text((w / 2, pad + step * i + step / 2), line, font=font, anchor="mm", fill="white")
    return img


def overlay(t):
    return banner


def probe(path):
    info = json.loads(subprocess.check_output(["ffprobe", "-v", "error", "-select_streams", "v:0", "-show_entries",
                                               "stream=width,height,r_frame_rate:format=duration", "-of", "json", path]))
    s = info["streams"][0]
    num, den = s["r_frame_rate"].split("/")
    return s["width"], s["height"], s["r_frame_rate"], float(num) / float(den), float(info["format"]["duration"])


def render(src, out):
    """Draw overlay(t) on every frame of src and save to out, keeping the audio."""
    ff = subprocess.Popen(["ffmpeg", "-y", "-v", "error", "-i", src,
                           "-f", "rawvideo", "-pix_fmt", "rgba", "-s", f"{w}x{h}", "-r", rate, "-i", "-",
                           "-filter_complex", "[0:v][1:v]overlay=shortest=1,format=yuv420p[v]",
                           "-map", "[v]", "-map", "0:a?", "-c:v", "libx264", "-crf", "18", "-c:a", "copy", out],
                          stdin=subprocess.PIPE)
    for i in range(math.ceil(duration * fps)):
        ff.stdin.write(overlay(i / fps).tobytes())
    ff.stdin.close()
    if ff.wait():
        sys.exit("ffmpeg failed")


src, out = sys.argv[1:3]
w, h, rate, fps, duration = probe(src)
banner = Image.new("RGBA", (w, h))
banner.paste(bar(), (0, 0))
render(src, out)