AI agent skill · by @krillinai

Krillinai Render Vertical

Use when rendering portrait videos with KrillinAI CLI, including converting source video to vertical format, adding short bilingual subtitles, rendering dubbed vertical videos, and checking vertical subtitle readability.

Archived 2026-10-23 · Source updated 2026-10-05 · License: Apache-2.0. Check the original repository for the latest version.

SKILL.md instructions

# KrillinAI Render Vertical

Use this skill for `render-vertical`. Read `skills/krillinai-cli/references/cli-contract.md` first for binary location, execution working directory, configuration, and JSON behavior.

## Bilingual Short-Subtitle Video

```bash
(cd "$KRILLINAI_CWD" && "$KRILLINAI_CLI" render-vertical \
  --workdir "$WORKDIR" \
  --video "$WORKDIR/origin_video.mp4" \
  --subtitle "$WORKDIR/short_origin_mixed_srt.srt" \
  --major-title "今日话题" \
  --minor-title "AI Video")
```

## Dubbed Vertical Video

```bash
(cd "$KRILLINAI_CWD" && "$KRILLINAI_CLI" render-vertical \
  --workdir "$WORKDIR" \
  --video "$WORKDIR/video_with_tts.mp4" \
  --subtitle "$WORKDIR/target_language_srt.srt" \
  --dubbed \
  --major-title "今日话题" \
  --minor-title "AI Video")
```

## Subtitle Behavior

The Go renderer follows the good behavior from `vertical_srt.py`:

- Chinese uses word segmentation before line decisions.
- Display width is used for line splitting: Chinese counts as width 2, other text as width 1.
- Long Chinese subtitles are split across time into multiple `Dialogue` entries instead of stacked with `\N`.
- The goal is to keep the screen to one English line plus one Chinese line when possible.

## Outputs

- `transferred_vertical_video.mp4`: source converted to portrait format.
- `vertical_bilingual.mp4`: default final vertical video.
- `vertical_dubbed.mp4`: final video with `--dubbed`.
- Final variants are reported through the manifest key `vertical_video`.

## Verification

Use text and visual checks:

```bash
rg -n -F '\\N' "$WORKDIR/formatted_vertical_bilingual.ass"
ffmpeg -y -ss 00:00:01 -i "$WORKDIR/vertical_bilingual.mp4" \
  -frames:v 1 "$WORKDIR/vertical_preview_%03d.jpg"
```

Also require terminal JSON with `"ok": true`, valid video/audio streams, readable subtitles, and non-garbled titles.