Tutorial Builder
150 lines
5.6 KiB
Python
150 lines
5.6 KiB
Python
import argparse
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import os
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import re
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import shutil
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import subprocess
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from pathlib import Path
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SRT_BLOCK_RE = re.compile(
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r"\s*(\d+)\s+([\d:,]+)\s+-->\s+([\d:,]+)\s+(.+?)(?=\n\s*\d+\s+\d\d:|\Z)",
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re.S,
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)
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def to_seconds(timestamp: str) -> float:
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h, m, rest = timestamp.split(":")
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s, ms = rest.split(",")
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return int(h) * 3600 + int(m) * 60 + int(s) + int(ms) / 1000
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def read_srt(path: Path) -> list[tuple[float, float, str]]:
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text = path.read_text(encoding="utf-8-sig")
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captions = []
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for _, start, end, body in SRT_BLOCK_RE.findall(text):
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clean_text = " ".join(line.strip() for line in body.strip().splitlines())
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captions.append((to_seconds(start), to_seconds(end), clean_text))
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if not captions:
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raise ValueError(f"No captions found in {path}")
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return captions
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def resolve_path(value: str) -> Path:
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return Path(value).expanduser().resolve()
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def media_duration(path: Path) -> float:
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result = subprocess.run(
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[
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"ffprobe",
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"-v", "error",
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"-show_entries", "format=duration",
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"-of", "default=noprint_wrappers=1:nokey=1",
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str(path),
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],
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check=True,
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capture_output=True,
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text=True,
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)
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return float(result.stdout.strip())
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def run(command: list[str]) -> None:
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print("Running:", " ".join(command))
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subprocess.run(command, check=True)
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def remove_temp_dir(path: Path) -> None:
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try:
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shutil.rmtree(path, ignore_errors=True)
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except PermissionError:
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pass
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except OSError:
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pass
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def main() -> None:
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parser = argparse.ArgumentParser(description="Create a timed voiceover WAV/MP3 from an SRT file on macOS.")
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parser.add_argument("--srt", required=True, help="Input SRT file")
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parser.add_argument("--voice", default="Daniel", help="macOS voice name, e.g. Daniel or Reed (English (US))")
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parser.add_argument("--rate", type=int, default=185, help="Speech rate. Higher is faster. Example: 180-200")
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parser.add_argument("--wav", required=True, help="Output WAV file")
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parser.add_argument("--mp3", default=None, help="Optional output MP3 file")
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parser.add_argument("--audio-output", default=None, help="Optional extra copy of the generated WAV file")
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parser.add_argument("--keep-temp", action="store_true", help="Keep temporary voice parts for debugging")
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parser.add_argument("--volume", type=float, default=1.0, help="Voiceover volume multiplier. Default: 1.0")
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parser.add_argument("--silence-padding", type=float, default=0.0, help="Seconds of silence after each caption, if the SRT slot allows it. Default: 0.0")
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parser.add_argument("--sample-rate", type=int, default=44100, help="Output sample rate. Default: 44100")
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parser.add_argument("--channels", type=int, default=2, choices=[1, 2], help="Output audio channels. Default: 2")
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args = parser.parse_args()
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srt_path = resolve_path(args.srt)
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wav_output = resolve_path(args.wav)
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mp3_output = resolve_path(args.mp3) if args.mp3 else None
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audio_output = resolve_path(args.audio_output) if args.audio_output else None
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work_dir = Path(__file__).resolve().parent / "voice_parts"
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if not srt_path.exists():
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raise FileNotFoundError(f"SRT not found: {srt_path}")
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if args.volume <= 0:
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raise ValueError("--volume must be greater than 0")
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if args.silence_padding < 0:
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raise ValueError("--silence-padding must be 0 or greater")
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work_dir.mkdir(parents=True, exist_ok=True)
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wav_output.parent.mkdir(parents=True, exist_ok=True)
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if mp3_output:
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mp3_output.parent.mkdir(parents=True, exist_ok=True)
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if audio_output:
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audio_output.parent.mkdir(parents=True, exist_ok=True)
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captions = read_srt(srt_path)
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segment_files = []
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try:
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for i, (start, end, text) in enumerate(captions, 1):
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duration = end - start
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raw_aiff = work_dir / f"raw_{i:03d}.aiff"
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segment_wav = work_dir / f"seg_{i:03d}.wav"
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run(["say", "-v", args.voice, "-r", str(args.rate), "-o", str(raw_aiff), text])
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spoken_duration = media_duration(raw_aiff)
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padding = min(args.silence_padding, max(duration - spoken_duration, 0))
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effective_duration = duration if args.silence_padding == 0 else min(duration, spoken_duration + padding)
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if spoken_duration > duration:
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print(f"Warning: caption {i} speech is {spoken_duration:.2f}s but slot is {duration:.2f}s; it will be trimmed.")
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audio_filter = f"volume={args.volume},apad,atrim=0:{effective_duration}"
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run([
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"ffmpeg", "-y",
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"-i", str(raw_aiff),
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"-af", audio_filter,
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"-ar", str(args.sample_rate),
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"-ac", str(args.channels),
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str(segment_wav),
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])
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segment_files.append(segment_wav)
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concat_list = work_dir / "list.txt"
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concat_list.write_text("".join(f"file '{os.path.abspath(file)}'\n" for file in segment_files), encoding="utf-8")
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run(["ffmpeg", "-y", "-f", "concat", "-safe", "0", "-i", str(concat_list), "-c:a", "pcm_s16le", str(wav_output)])
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print(f"Done: {wav_output}")
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if audio_output:
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run(["ffmpeg", "-y", "-i", str(wav_output), "-c:a", "pcm_s16le", str(audio_output)])
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print(f"Done: {audio_output}")
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if mp3_output:
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run(["ffmpeg", "-y", "-i", str(wav_output), "-codec:a", "libmp3lame", "-b:a", "192k", str(mp3_output)])
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print(f"Done: {mp3_output}")
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finally:
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if not args.keep_temp:
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remove_temp_dir(work_dir)
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if __name__ == "__main__":
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main()
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