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Short Video Optimization ​

Short-form videos (TikTok, Kuaishou, YouTube Shorts, etc.) have different dubbing needs compared to long videos. Subtitles must be shorter and more compact to fit vertical phone screens. Below are specialized optimization steps for short-form video content.

Core Principle ​

Short-video subtitles should be concise:

  • Fewer characters per subtitle line
  • Shorter subtitle duration
  • Smaller font size

Optimization Steps ​

1. Choose the Right ASR Channel ​

Use faster-whisper (local) + large-v3 with STT again enabled.

Adjust parameters under More Settings... → ASR Settings(R):

  • Max speech duration (seconds): Set to 3–6 (shorter values produce shorter subtitles)
  • Min speech duration (milliseconds): Set to 1000–3000 (shorter values help keep subtitles brief)

⚠️ Very short durations reduce recognition accuracy but help keep subtitles short. Longer durations improve accuracy but produce longer subtitles.

2. Limit Subtitle Character Count ​

Under More Settings... → ASR Settings(R):

  • CJK subtitle characters: Adjust to 10–15 characters
  • Other language subtitle characters: Adjust to 20–40 characters

This prevents subtitles from overflowing the screen.

3. Reduce Font Size ​

If subtitles are still too long, go to More Settings... → Hard Sub Style and reduce the font size by 1–2 points.

4. Delete Punctuation ​

Under More Settings..., select Delete punctuati... for a cleaner look.

5. LLM Resegment (Optional) ​

If you are not using a clone voice, try enabling LLM Resegment and configuring a DeepSeek API key.

Note: When using a clone voice, do not enable LLM Resegment — it disrupts the timeline and degrades clone quality.

6. Translation Channel ​

Select DeepSeek or another AI channel with a latest flagship online model.

7. Dubbing Channel ​

Choose a dubbing channel based on your needs. If using a clone voice:

  • Make sure LLM Resegment is disabled
  • Under More Settings... → ASR Settings(R):
    • Max speech duration: 3–10 seconds
    • Min speech duration (ms): greater than 3000

Before vs After ​

BeforeAfter
Subtitles too long, overflow screenShort, compact subtitles for vertical screens
Font too large, obscures videoModerate font size, no obstruction
Punctuation disrupts readingClean and concise without punctuation
Long subtitle durationShort duration, tight pacing