| name | srt-from-script |
| description | Build an SRT subtitle file from a 3-shot short-drama script (ai-video-script OUTPUT FORMAT). Reads each SHOT_N block's DURATION_S + VOICEOVER, emits cumulative-timestamped SRT cues. Pure text-processing, no LLM, no network. Used by meta-short-drama between merge and the final subtitle-burn step. |
| provenance | {"origin":"agentos-original","license":"MIT"} |
| metadata | {"agentos":{"risk":"low","capabilities":["filesystem-write"],"requires":{"anyBins":["python","python3"]}}} |
| entrypoint | {"command":"python {baseDir}/scripts/build_srt.py","args":["--output","{{ with.output_path }}","--gap-ms","{{ with.gap_ms | default(200) }}","--leading-offset-ms","{{ with.leading_offset_ms | default(0) }}"],"stdin":"{{ with.script }}","parse":"text","timeout":30} |
srt-from-script
Parses an ai-video-script 3-shot script and writes an SRT subtitle file
whose cues track the script's VOICEOVER per shot, time-coded with
cumulative shot durations.
Inputs (with:)
| key | required | default | notes |
|---|
script | yes | — | Full script text (the entire OUTPUT FORMAT block, including OVERVIEW + SHOT_1..N). Passed via stdin so the orchestrator does not need to write a temp file. |
output_path | yes | — | Output .srt path. Parent dir created if missing. |
gap_ms | no | 200 | Tail pad subtracted from each cue's end so the subtitle vanishes ~200 ms before the next shot starts — avoids cuts clipping mid-character. |
leading_offset_ms | no | 0 | Shifts every cue forward by this many ms. Set to the cover/intro clip duration when the merged video prepends a title card before SHOT_1. |
Parsing rules
- A shot with
VOICEOVER: none or empty contributes no SRT cue but its
DURATION_S still advances the timeline cursor.
- Cue language follows the script verbatim. Chinese stays Chinese,
English stays English — no translation.
- Cumulative timestamps: SHOT_1 starts at 00:00:00,000; SHOT_2 starts at
SHOT_1.duration; etc.
- End time of each cue = next-shot start −
gap_ms, clamped to ≥ 800 ms
after start so very short voiceover lines remain readable.
Output
Prints the absolute path of the written .srt on stdout.
The file is UTF-8 encoded so CJK voiceover lines survive when ffmpeg
reads them via the subtitles= filter.
Limits
- Assumes the script follows ai-video-script's strict OUTPUT FORMAT
(
=== SHOT_N === blocks with DURATION_S: and VOICEOVER: fields).
Drift away from that format → zero cues, exit 1.
- 3-5 shots tested. Larger shot counts work but timestamps grow.
