How to subtitle a Chinese drama into Vietnamese

💡 To subtitle a Chinese drama into Vietnamese, open the source SRT in Subtitle Edit, configure 17 CPS / 42 CPL / 833 ms minimum before line one, and build a name and honorific mapping table before the session. Vietnamese runs 3-4x longer in characters than the Chinese source, so short Chinese cues often need their out-times extended before translation begins.

What do I prepare before translating line one?

Three things need to be in place before you open any Chinese source SRT for Vietnamese translation. First, verify the source encoding: open the Chinese SRT in Subtitle Edit and confirm the encoding bar at the bottom reads UTF-8. A source file in GBK or GB18030 encoding can render Chinese correctly on a Windows system but produces garbled output when you re-save with Vietnamese diacritics attached.

Second, build a name and honorific glossary. Chinese palace dramas have a fixed set of royal titles that always translate to the same Sino-Vietnamese equivalents. I build this table before session one and paste from it rather than re-deciding each occurrence. The table in this article covers the core titles for period dramas.

Third, configure Subtitle Edit for Vietnamese delivery limits before the first cue:

Subtitle Edit: Options > Settings > Subtitle

For Vietnamese adult delivery:
  Maximum characters per second:   17
  Maximum characters per line:     42
  Minimum display time (ms):      833   (5/6 second)
  Maximum display time (ms):    7 000

Recommended checks (Tools > Check subtitle quality):
  Enable: CPS too fast
  Enable: Line too long
  Enable: Duration too short
  Enable: Duration too long
  Enable: Gap too short between subtitles
  Minimum gap: 2 frames

• 17 CPS: the Netflix Vietnamese TTSG adult limit. Any event exceeding this turns red in the grid instantly as you type.
• 42 CPL: applies to Vietnamese the same as English. Vietnamese syllables with diacritics still count as one character each.
• 833 ms minimum: the Netflix TTSG general floor. Chinese source cues shorter than this need to be extended before translation.
• 2-frame gap: the TTSG timing requirement. Chinese source SRTs sometimes have gaps shorter than 2 frames that need correction before export.

How does Chinese text expand into Vietnamese characters?

Vietnamese is an analytic language: grammatical relationships that Chinese encodes in a single character (or in context) require explicit particles in Vietnamese. The practical result is that most Chinese lines become 3-4x longer in Vietnamese character count. These are real examples with the full character count including spaces and punctuation, since that is how Subtitle Edit and Netflix both measure CPS:

⚠ marks events that exceed the 17 CPS Vietnamese adult limit and need out-time extension before translation.

The pattern: short Chinese cues (under 5 chars) usually translate within the 17 CPS limit. Medium-length Chinese cues (8-12 chars) in tight 2-second windows are where Vietnamese CPS violations appear. These are the events to extend before you write the Vietnamese line.

How do I configure the translation workflow in Subtitle Edit?

Open the Chinese source SRT (File > Open). The subtitle list shows each cue with its timing. I configure the settings above first, then translate line by line, keeping a text editor open alongside Subtitle Edit for quick glossary lookups. As each Vietnamese line is typed, the CPS column updates live. Red = must fix before moving on.

For the final QC pass before export:

Subtitle Edit: Tools > Fix Common Errors

Enable these checks for Vietnamese delivery:
  Duration too short  (min: 833 ms)
  Duration too long   (max: 7 000 ms)
  CPS too fast        (max: 17)
  Line too long       (max: 42 chars)
  Gap too short       (min: 2 frames)

Export: File > Save As > SubRip (.srt)
  Encoding: UTF-8   (required for Vietnamese diacritics)

• Fix Common Errors: catches systematic issues like multiple consecutive short events and over-long lines in a single sweep.
• UTF-8 on export: the most common delivery error on first-time deliveries is a Windows-1252 or Latin-1 SRT where every Vietnamese diacritic renders as a question mark. Always confirm UTF-8 in the Save dialog.

How do I handle Chinese names and honorifics in Vietnamese?

Palace drama honorifics translate one-to-one into Sino-Vietnamese equivalents derived from the same classical Chinese root characters. The mapping is systematic. I build this table once per project and apply it consistently. The key caveat: when the same character can hold different titles depending on who is speaking to whom, the table gives you the target-language title for each rank - but which form to use in a specific line still requires watching the scene.

Character names follow the Sino-Vietnamese reading convention: each Chinese character in a name maps to its Sino-Vietnamese equivalent. For example: 李 becomes Lý, 张 becomes Trương, 王 becomes Vương, 陈 becomes Trần, 刘 becomes Lưu. A two-character name like 李明 becomes Lý Minh. For modern drama characters with names that have no established Sino-Vietnamese reading in common use, I transliterate the pinyin using Vietnamese phonology - but this is a secondary case best resolved per project with a note from the Chinese studio.

What timing adjustments does the Chinese source SRT actually need?

Chinese source SRTs are timed for Chinese reading speed, which works well for Chinese viewers but sets a tighter window for Vietnamese translation. Three categories of events need attention before translation begins:

• Cues under 1.5 seconds with medium-length Chinese text: extend the out-time by 0.3-0.5 s before writing the Vietnamese line. At 1.0 s, a 7-character Chinese line expands to roughly 24 Vietnamese characters - 24 CPS, over the limit. With 1.5 s, those same 24 chars = 16 CPS, inside the limit.
• Reaction cues (single-character responses like 嗯, 啊, 好): usually 0.5-0.8 s long. Vietnamese equivalents ("Vâng.", "Ừ.", "Được.") are short enough to fit, but always verify the 833 ms minimum floor.
• Events with gaps shorter than 2 frames: Subtitle Edit's gap check catches these. They usually come from the Chinese source and need correction regardless of translation.

Running a timing pre-check in Subtitle Edit (Tools > Fix Common Errors with "Duration too short" enabled, threshold 833 ms) before writing a single Vietnamese word takes about 15 minutes on a 45-minute episode and prevents the full CPS revision pass that would otherwise follow.

What can I do myself, and when does a Vietnamese subtitle specialist pay off?

The workflow above is DIY territory. Subtitle Edit is free, the honorific table is reusable, and the timing pre-check is a quick pass. A bilingual Chinese-Vietnamese translator using this workflow can deliver CPS-compliant SRT files for most standard drama content.

Where the investment in a specialist becomes clear: register accuracy in palace drama scenes with complex hierarchy. When a court official addresses a consort above his rank, the Vietnamese pronoun system requires a specific pronoun pair (and the choice between "thần" and "hạ thần" for the minister's self-reference) that carries real meaning. Getting register wrong in a prestige drama is a credibility problem. A specialist with deep familiarity with classical Sino-Vietnamese court language catches those cases because they watch the scene and understand the hierarchy, not just match a character count.

Second: when Chinese character names are obscure or the production uses invented historical names, the Sino-Vietnamese reading requires real classical Chinese knowledge - not just a character lookup. If you are delivering for a streaming platform where honorifics and name consistency are verified against a glossary, a specialist review pass is worth the time.

For CN drama to Vietnamese subtitle translation with correct honorifics, register-accurate pronoun choices, and CPS-compliant delivery, my Vietnamese subtitle translation service handles the full workflow from source SRT to QC-verified delivery.

FAQ

Official Sources

• Netflix Timed Text Style Guide: Vietnamese - CPS 17 adult, 13 children; 42 CPL, 2 lines max. Verified November 2026.
• Netflix Timed Text Style Guide: General Requirements - minimum 5/6 s duration, 7 s maximum, 2-frame gap. Verified November 2026.
• Netflix Timed Text Style Guide: Character Limits per Line - Simplified Chinese: 23 CPL standard, 16 for Netflix Originals. Verified November 2026.
• Subtitle Edit (nikse.dk) - CPS settings path: Options > Settings > Subtitle, Tools > Fix Common Errors. Verified November 2026.