Turns on ruff's S rules, which matter for code that shells out to ffmpeg,
aria2c and yt-dlp. S607 is ignored project-wide: binaries are looked up on
PATH deliberately and preflight-checked with shutil.which, so hardcoding
absolute paths would be less portable rather than safer.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
Lifts decode() out of scripts/smoke.py, where it was duplicated verbatim in
scripts/bench.py, and adds the probe and extraction calls the pipeline needs.
Command construction is separate from execution so argument lists can be
asserted directly instead of by monkeypatching internals. flac_command always
passes -sample_fmt s16: the FLAC encoder accepts only s16/s32 while AAC and
Opus decode to fltp, so leaving it to filter-graph negotiation can fail.
The default profile keeps the source rate and channels, since lossless
extraction is the point of choosing FLAC; downmixing to 16 kHz mono happens
at decode time instead.
Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
JMR-devandClaude Opus 5