| |
| """Concatenate the .oga files of a folder into one long .oga file (needs ffmpeg). |
| |
| Usage: python scripts/concat_oga.py # data/amir-oga/*.oga -> data/amir-oga.oga |
| python scripts/concat_oga.py data/other -o out.oga |
| python scripts/concat_oga.py --gap 0.5 # half a second of silence between files |
| |
| Files are joined in natural filename order (2.oga before 10.oga). The audio is re-encoded to |
| mono Opus so files with different sample rates or channel counts still join cleanly; |
| --copy joins without re-encoding (faster, lossless) when all files share the same format. |
| """ |
| from __future__ import annotations |
|
|
| import argparse |
| import re |
| import subprocess |
| import sys |
| import tempfile |
| from pathlib import Path |
|
|
|
|
| def natural_key(path: Path): |
| return [int(p) if p.isdigit() else p.lower() for p in re.split(r"(\d+)", path.name)] |
|
|
|
|
| def main() -> int: |
| ap = argparse.ArgumentParser(description=__doc__.splitlines()[0]) |
| ap.add_argument("folder", nargs="?", default="data/amir-oga", type=Path) |
| ap.add_argument("-o", "--output", type=Path, help="default: <folder>.oga next to the folder") |
| ap.add_argument("--gap", type=float, default=0.0, help="seconds of silence between files (re-encode only)") |
| ap.add_argument("--bitrate", default="32k", help="Opus bitrate when re-encoding (default 32k)") |
| ap.add_argument("--copy", action="store_true", help="join without re-encoding") |
| args = ap.parse_args() |
|
|
| out = args.output or args.folder.with_suffix(".oga") |
| files = sorted((f for f in args.folder.glob("*.oga") if f.resolve() != out.resolve()), key=natural_key) |
| if not files: |
| print(f"no .oga files in {args.folder}", file=sys.stderr) |
| return 1 |
| if args.copy and args.gap: |
| print("--gap needs re-encoding; drop --copy", file=sys.stderr) |
| return 1 |
|
|
| |
| with tempfile.NamedTemporaryFile("w", suffix=".txt", delete=False, encoding="utf-8") as lst: |
| for f in files: |
| lst.write("file '" + str(f.resolve()).replace("'", "'\\''") + "'\n") |
| cmd = ["ffmpeg", "-hide_banner", "-loglevel", "error", "-y", "-f", "concat", "-safe", "0", "-i", lst.name] |
| if args.copy: |
| cmd += ["-c", "copy"] |
| elif args.gap: |
| |
| cmd = ["ffmpeg", "-hide_banner", "-loglevel", "error", "-y"] |
| for f in files: |
| cmd += ["-i", str(f)] |
| pads = "".join(f"[{i}:a]aresample=48000,aformat=channel_layouts=mono,apad=pad_dur={args.gap}[a{i}];" |
| for i in range(len(files))) |
| joined = "".join(f"[a{i}]" for i in range(len(files))) |
| cmd += ["-filter_complex", f"{pads}{joined}concat=n={len(files)}:v=0:a=1[out]", "-map", "[out]", |
| "-c:a", "libopus", "-b:a", args.bitrate] |
| else: |
| cmd += ["-ac", "1", "-c:a", "libopus", "-b:a", args.bitrate] |
| cmd += ["-f", "ogg", str(out)] |
|
|
| try: |
| subprocess.run(cmd, check=True) |
| except FileNotFoundError: |
| print("ffmpeg not found (sudo apt install ffmpeg)", file=sys.stderr) |
| return 1 |
| except subprocess.CalledProcessError as e: |
| print(f"ffmpeg failed with exit code {e.returncode}", file=sys.stderr) |
| return 1 |
| finally: |
| Path(lst.name).unlink(missing_ok=True) |
| print(f"{len(files)} files -> {out}") |
| return 0 |
|
|
|
|
| if __name__ == "__main__": |
| sys.exit(main()) |
|
|
