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# -*- coding: utf-8 -*-
"""Builds the final video of the scenes made in Blender.
Composites in a single ffmpeg pass:
dotted background + PNG sequence with alpha (3D) + Manim overlay + audio
The overlay carries the chip, progress bar and subtitles, so the style comes
from the same code as the Manim videos.
"""
import glob, os, subprocess, sys
ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, os.path.join(ROOT, "scripts"))
import build_video
FPS = 30
def compose(name, add_music=True):
background = os.path.join(ROOT, "media", "images", "overlay", "fondo.png")
folder = os.path.join(ROOT, "render", name)
seq = os.path.join(folder, "f%04d.png")
overlay = os.path.join(ROOT, "media", "videos", "overlay", "1920p30", f"{name}.mov")
for p in (background, overlay):
if not os.path.exists(p):
raise SystemExit(f"missing {p}")
n = len(glob.glob(os.path.join(folder, "f*.png")))
if n < 30:
raise SystemExit(f"[{name}] only {n} frames rendered")
wav = build_video.build_track(name, add_music)
out = os.path.join(ROOT, "out", f"{name}.mp4")
cmd = [
"ffmpeg", "-v", "error", "-y",
"-loop", "1", "-framerate", str(FPS), "-i", background,
"-framerate", str(FPS), "-start_number", "1", "-i", seq,
"-i", overlay,
"-i", wav,
"-filter_complex",
"[0:v][1:v]overlay=format=auto[a];[a][2:v]overlay=format=auto,format=yuv420p[v]",
"-map", "[v]", "-map", "3:a",
"-filter:a", "loudnorm=I=-14:TP=-1.5:LRA=11,aresample=48000",
"-frames:v", str(n),
"-c:v", "libx264", "-profile:v", "high", "-pix_fmt", "yuv420p",
"-preset", "slow", "-crf", "20", "-r", str(FPS),
"-c:a", "aac", "-b:a", "192k", "-ac", "2",
"-movflags", "+faststart", "-shortest", out,
]
subprocess.run(cmd, check=True)
d = subprocess.run(["ffprobe", "-v", "error", "-show_entries", "format=duration",
"-of", "csv=p=0", out], capture_output=True, text=True).stdout.strip()
print(f"[{name}] {out} {float(d):.1f}s {os.path.getsize(out)/1e6:.1f} MB "
f"({n} frames 3D)", flush=True)
return out
if __name__ == "__main__":
for n in (sys.argv[1:] or ["bolapeluda", "caos", "diferencial"]):
compose(n)
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