How to add a video inside text with Claude

Make the video in input.mp4 play inside text. Use Python with Pillow (not ffmpeg's drawtext) to draw one overlay image the size of the video: a solid (10, 10, 14) near-black card with the words "PURE" and "GLOW" cut out of it as fully transparent holes, one word per line, in Arial Black (or another heavy bold font). Size the font so the wider word is 90% of the frame width, then stretch each word 1.6 times taller, and center the words horizontally with their middles at 36% and 64% down the frame. Draw it at 4x size and shrink it for smooth edges. With ffmpeg, put the card over every frame, fading the card in from fully transparent starting at 1.0 seconds over 0.5 seconds, so the plain video shows for the first second and only the letters show video from 1.5 seconds to the end. Keep the audio, the original size and length, 30fps H.264 yuv420p, and save it as output.mp4.

#!/usr/bin/env python3
"""Video inside text: a black card fades in and the footage keeps playing only inside two lines of huge letters.

Usage: python3 video-inside-text.py input.mp4 output.mp4
Needs ffmpeg and Pillow (pip install pillow).
"""
import io
import subprocess
import sys
from pathlib import Path

from PIL import Image, ImageDraw, ImageFont

LINES = ["PURE", "GLOW"]         # the words the video shows through, one per line
WIDTH = 0.90                     # widest line as a share of the frame width
STRETCH = 1.6                    # letters drawn this many times taller than normal
CENTERS = [0.36, 0.64]           # where each line's middle sits (0-1 down the frame)
CARD = (10, 10, 14)              # color everywhere outside the letters
START = 1.0                      # second the card starts to fade in
FADE = 0.5                       # seconds the fade takes
SMOOTH = 4                       # draw this many times larger, then shrink, for smooth letter edges
FONTS = ["/System/Library/Fonts/Supplemental/Arial Black.ttf",    # macOS
         "/usr/share/fonts/truetype/dejavu/DejaVuSans-Bold.ttf",  # Linux
         "C:/Windows/Fonts/ariblk.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 card(w, h):
    """The card with see-through letters cut out of it."""
    W, H = w * SMOOTH, h * SMOOTH
    probe_font = ImageFont.truetype(FONT_FILE, 100)
    widest = max(probe_font.getlength(line) for line in LINES)
    font = ImageFont.truetype(FONT_FILE, round(100 * WIDTH * W / widest))
    letters = Image.new("L", (W, H))
    for line, y in zip(LINES, CENTERS):
        word = Image.new("L", (W, H))
        ImageDraw.Draw(word).text((W / 2, H / 2), line, font=font, anchor="mm", fill=255)
        word = word.crop(word.getbbox())
        word = word.resize((word.width, round(word.height * STRETCH)), Image.LANCZOS)
        letters.paste(word, (round((W - word.width) / 2), round(H * y - word.height / 2)))
    big = Image.new("RGBA", (W, H), CARD + (255,))
    big.putalpha(letters.point(lambda v: 255 - v))
    return big.resize((w, h), Image.LANCZOS)


src, out = sys.argv[1:3]
w, h = map(int, subprocess.check_output(["ffprobe", "-v", "error", "-select_streams", "v:0", "-show_entries",
                                         "stream=width,height", "-of", "csv=p=0", src], text=True).split(","))
png = io.BytesIO()
card(w, h).save(png, "PNG")
subprocess.run(["ffmpeg", "-y", "-v", "error", "-i", src, "-loop", "1", "-f", "png_pipe", "-i", "-",
                "-filter_complex", f"[1:v]format=rgba,fade=in:st={START}:d={FADE}:alpha=1[card];"
                                   "[0:v][card]overlay=shortest=1,fps=30,format=yuv420p[v]",
                "-map", "[v]", "-map", "0:a?", "-c:v", "libx264", "-crf", "18", "-c:a", "copy", out],
               input=png.getvalue(), check=True)