[joepetjr]

What

Release 0.1.2. Every ffmpeg and ffprobe step's timeout now grows with the file it reads, and the re-encode fallback seeks on the input side.

• io_timeout(floor_sec, nbytes) and MIN_IO_BYTES_PER_SEC (20 MB/s). The keyframe probe (600 s floor), the stream copy (1800 s floor) and the concat (1800 s floor, double the bytes with faststart) use it instead of a flat window.
• reencode_range runs ffmpeg -ss S -i master -ss 0 -t D …. The demuxer jumps to the keyframe before the cut, and accurate seek drops frames up to the exact start. The output-side -ss 0 drops the stream-copied audio's pre-cut packets. Without it, the concat demuxer plays about half a GOP of audio from before the cut; the integration suite caught this. The timeout is max(timeout, D × 20) (REENCODE_SEC_PER_SEC).
• 0.1.2 also releases the unreleased fix(segments): reject negative and non-finite durations #7 and fix(keyframes): expire cached probe failures so they can recover #8. __version__ was still 0.1.0 and now matches pyproject.

Why

GoMoveShift's Ace Basin day master is 110 GB on a 9p mount. On 2026-10-27 at 12:10 ET, probe_keyframes hit the flat 600 s timeout, so keyframes came back unknown. Every long-form range then fell to reencode_range. That path used an output-side seek, decoding the master from byte 0 for every range, under a flat 3600 s timeout. LF1 has 8 ranges, up to 1147 s each, through x265 -preset slow, so each range would run for hours or time out.

Tests

• New tests: the probe window scales with a sparse 118 GB file. The copy, re-encode and concat timeouts scale with size or length. The re-encode argv has an input seek, -ss 0 after -i, and -t.
• Real ffmpeg: the accurate-seek re-encode gives exactly 60 frames, and the output is 2.0 s with no audio leak. The re-encoded and copied neighbours concat to 5.0 s.
• pytest -q: 152 passed. ruff check .: clean.

After merge

Tag v0.1.2 on the merge commit. Then framegrade bumps its keycut pin (pyproject.toml:112) and releases.

[joepetjr]

Hard-denied (hard-deny: protected path family) and ready to merge -- all checks green.

Offending paths:

• pyproject.toml

Human merge:
sudo gh-merge-approved 9 --repo Back-Road-Creative/keycut --wait --yes