krillinai-render-vertical - SKILL.md Agent Skill

name: krillinai-render-vertical description: 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.

KrillinAI Render Vertical

Use this skill for render-vertical.

Bilingual Short-Subtitle Video

./build/krillinai-cli render-vertical \
  --workdir tasks/demo \
  --video tasks/demo/origin_video.mp4 \
  --subtitle tasks/demo/short_origin_mixed_srt.srt \
  --major-title "今日话题" \
  --minor-title "AI Video"

Dubbed Vertical Video

./build/krillinai-cli render-vertical \
  --workdir tasks/demo \
  --video tasks/demo/video_with_tts.mp4 \
  --subtitle tasks/demo/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: final vertical video with subtitles.

Verification

Use text and visual checks:

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

Check that moderate Chinese subtitles do not become two stacked Chinese lines and that titles are not garbled.