File size: 3,558 Bytes
1adcd96 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 | #!/usr/bin/env python3
"""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
# ffmpeg's concat demuxer reads the file list from a text file; quotes in names must be escaped
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:
# the gap is added by padding every input, so it needs one input per file instead of the list
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())
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