v3.4.0

Automated release: version and notes generated from pull requests merged since 3.3.0.

Added

• check.py --compare REF --expect-changed SPAN[@X,Y,W,H]|none: say where the picture may
  differ, and fail on a change anywhere else (#439). After a small re-render ("fix the caption at
  0:12 to 0:18") nothing could tell, short of watching the file again, that the rest did not move:
  the similarity row grades one mean over the whole picture, and a 200x60 box on a 1080p frame
  leaves it above 0.99. A change_scope row now measures both files tile by tile (32x18, 8-bit RGB
  difference) and grades it against the declaration: a change outside the declared spans is a
  FAIL with its time, frame count and place; a declared span that did not change is a WARN; and
  two files that cannot be compared (another size, another frame count, a failed pass) are a FAIL,
  not a pass. --change-floor sets the per-tile floor (default 24 of 255, chosen from phone and
  screen-recording footage). Picture only, same-length edits only; references/scripts.md lists
  the limits.

Fixed

• No numeric flag of any tool takes nan or inf any more. argparse's float reads both
  (and 1e999), and every type=float flag of every tool passed them on: 232 of 232 runs across
  25 tools. Some ended as a traceback (--fps nan, --timeout inf, graphics.py --scale), some
  as ffmpeg's "Invalid argument" under kind: ffmpeg (loudness.py -I nan, silence.py --threshold), most were carried silently. One registration in the shared flag set now refuses
  them at parse time for all 42 tools (a failure document with --json, a usage error without),
  and the shared time parser refuses a non-finite time
  (cut.py --start nan, --duration inf, pad.py --end nan, an @nan rate) as kind: input.

Changed

• The plugin branch holds the plugin under ffmpeg-skill/, not at its root. Installed from
  the 3.3.0 branch by ref, Claude Code cached 2.6 MB but Codex kept the whole clone (39 MB). As a
  git-subdir source both copy the directory alone (2.6 MB). The marketplace entry still points at
  the repository root until a release has published the new layout.
• check.py --expect-changed; refuse nan/inf for every numeric flag; plugin branch as a subdirectory (#440)

What's Changed

• check.py --expect-changed; refuse nan/inf for every numeric flag; plugin branch as a subdirectory by @kajisho5 in #440

Full Changelog: v3.3.0...v3.4.0