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9459cd0 | 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 | """
Thin wrappers around ffmpeg/ffprobe subprocess calls.
"""
import json
import subprocess
def probe_duration(path: str) -> float:
"""Returns media duration in seconds via ffprobe."""
out = subprocess.run(
["ffprobe", "-v", "error", "-show_entries", "format=duration",
"-of", "json", path],
capture_output=True, text=True, check=True,
)
data = json.loads(out.stdout)
return float(data["format"]["duration"])
def run_ffmpeg(args: list[str], log_path: str | None = None):
"""Runs an ffmpeg command, raising with stderr captured on failure."""
cmd = ["ffmpeg", "-y"] + args
result = subprocess.run(cmd, capture_output=True, text=True)
if log_path:
with open(log_path, "a") as f:
f.write(" ".join(cmd) + "\n")
f.write(result.stderr + "\n")
if result.returncode != 0:
raise RuntimeError(f"ffmpeg failed ({result.returncode}): {result.stderr[-2000:]}")
return result
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