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t27f skill: sweep every mode 5 crossfade frame, 324 renders, 0 flagged (Closes #10651) - #10675
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Closes #10651) Whole-frame colour count on every crossfade frame of every lesson, language, voice and orientation with PR #10647's binary: 10368 frames, 0 flagged. The #10632 control is flagged on 162 of 162 renders. Adds the method and four ffmpeg lab traps (-nostdin, pids.max thread caps, lavfi duration format, pkill leaving children). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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October 18, 2026 21:43
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Closes #10651
The pixel sweep #10651 asked for, run on the Railway lab, with its method and four ffmpeg traps written into
.claude/skills/t27f/SKILL.md. Skill text only: no spec, gate, cap or ledger change.Result
Each render is mode 5 of
specs/t27f/lesson_reel.t27, using the solid-colour scene clips. Both crossfades were checked, 16 frames each (start = ceil(offset x 30)), counting the distinct colours of the whole frame scaled to 1/4 with area averaging.The grid was 27 lessons x 2 languages (en, ru) x 3 voices (1300/4200/6800, 900/2600/4100 and 700/4200/8000 ms), and every cell came out the same. No render was short (all had 32 frames), and ffmpeg's stderr was empty for every one.
The control flags frames 20..31, crossfade 1, on voices 1 and 3, where the last card is drawn over the blend: 12 frames x 108 renders. On voice 2 it flags only frame 31, the last frame of crossfade 1: 1 frame x 54 renders. #10647 clears both.
Not covered
cmpthat their graphs did not move.🤖 Generated with Claude Code