Subtitle Translation QA and Export Checklist: Source Text, Bilingual Review, Timing, and File Formats

Key Takeaways

Subtitle translation quality depends on the source transcript. Correct source text before trusting translated lines.
Bilingual review should check names, terms, numbers, reading length, and timing.
Save edits before export so the exported SRT, VTT, ASS, JSON, Markdown, or TXT file reflects the reviewed version.
Use Subtitle Transcription for timestamped captions and Video Summary for structured notes.
Keep public URLs and local uploads within the current Subtitle Transcription limits shown in the product.

1. Translation QA starts with source QA

Many subtitle issues begin before translation. If the original transcript has a wrong name, missing number, or shifted timestamp, the translated subtitle will inherit the problem. That is why a good subtitle workflow reviews the source transcript first.

Use this order:

Create the subtitle task in Subtitle Transcription.
Review the source transcript.
Correct names, product terms, numbers, acronyms, and obvious recognition errors.
Generate or review translation.
Compare source and translated lines on the same timeline.
Save edits.
Export the needed format.

This is slower than exporting immediately, but it creates a deliverable that editors, translators, and publishers can actually trust.

2. Bilingual timeline checklist

When reviewing bilingual subtitles, check each line for four kinds of quality:

QA area	What to check
Meaning	Does the translation preserve the speaker's intent?
Terms	Are product names, people, locations, and technical terms consistent?
Timing	Does the line appear and disappear at the right moment?
Readability	Is the translated line short enough to read on screen?

For long videos, review in sections. A 120-minute file can accumulate small errors if the reviewer only checks the first few minutes. Use chapters, scene changes, or topic breaks to divide the work.

3. Choose the export format by destination

Different subtitle formats solve different downstream jobs:

Format	Common use
SRT	Simple captions for editors and players
VTT	Web video and browser-based playback
ASS	Styled subtitles when positioning and style matter
JSON	Structured workflows and internal processing
Markdown	Notes, documentation, and human review
TXT	Plain text reuse without timing emphasis

If the file will go to a video editor, SRT is often the safest first export. If the file will be embedded in a web player, VTT is usually more appropriate. If the team needs a review document, Markdown or TXT can be easier to scan.

For a deeper format comparison, see Subtitle Export Formats Explained.

4. Common failure points

Subtitle workflows often fail quality review for predictable reasons:

The source URL was no longer public.
The local file was too large or too long for the current task rules.
Background noise reduced transcript accuracy.
A speaker name was misheard and repeated across the output.
Translation expanded too much and became hard to read.
Edits were made but not saved before export.
The wrong format was selected for the destination.

Most of these are workflow issues rather than a reason to abandon the task. Re-check source access, revise the transcript, save changes, then export again.

5. When to use summary instead

Subtitle QA is not always necessary. If the user only needs the main points of a long video, use Video Summary. Summary is better for:

Fast research notes.
Chapters and topic structure.
Action items.
Mindmaps.
Follow-up questions.
Briefing documents.

Subtitle Transcription is better for:

Captions.
Translation review.
Exact quotes.
Editor handoff.
Accessibility preparation.
Time-aligned files.

For the decision tree, read Video Summary vs Subtitle Transcription.

6. Reviewer handoff template

Use this short handoff when a subtitle task moves from AI output to human review:

Field	Example
Source	Public URL or local file name
Target language	English, Chinese, Japanese, or another supported output
Priority terms	Brand names, people, product terms, acronyms
Risk areas	Numbers, quotes, legal terms, technical claims
Export target	SRT, VTT, ASS, JSON, Markdown, or TXT
Final owner	Person responsible for publishing or editor handoff

This reduces ambiguity and prevents the reviewer from guessing why the subtitle file exists.

7. FAQ

Should I export before reviewing?

No. Export after source and translated lines have been checked and saved. Otherwise, the exported file may preserve errors that were visible in the review interface.

Is bilingual subtitle QA only for long videos?

No. Short videos can also contain names, numbers, or product terms that need review. Long videos simply make the risk easier to miss.

Can summary replace subtitles?

Not when the deliverable needs captions, timestamps, translation, or exact text. Summary can help understand the source, but it is not a substitute for a reviewed subtitle file.