Subtitles and translation
Turn the audio on your timeline into a subtitle track. There are two routes — do it in the browser, or choose the server engine, which uses credits.
How the two differ
| Browser | Server engine | |
|---|---|---|
| Does audio leave | No | Sent to the engine |
| Maximum length | Your timeline | 30 minutes |
| Language detection | Automatic (8 selectable) | Automatic |
The browser route has no length limit, and neither the audio nor the transcript leaves your machine — which matters when you are working with a recording you cannot hand to anyone else.
Server engine maximum credits
| Length | Up to (credits) |
|---|---|
| 1 minute | 2 |
| 5 minutes | 9 |
| 10 minutes | 18 |
| 30 minutes | 53 |
These are the ceilings taken up front; after the run it is recalculated on actual usage and the difference is refunded. Thirty minutes is the maximum length per run
It works out the spoken language
It listens first and works out the spoken language. The languages you can pick by hand are Korean · English · Japanese · German · Spanish · French · Portuguese · Chinese.
If you already know the language, select it — that is more accurate. Picking the wrong one makes the model invent words nobody said, so automatic detection is for when you genuinely do not know.
Nine translation tracks
Finished subtitles can be moved into 한국어 · English · 日本語 · Deutsch · Español · Français · Português · 简体中文 · 繁體中文 tracks, and the original stays in place.
Translating needs Chrome 138 or newer.
Timings get cleaned up
HFLUX tightens subtitle timings to the actual speech, so captions do not stay on screen longer than the audio.
How billing works
The server engine takes a length-based ceiling up front, settles on actual usage and refunds the difference. There is no monthly subscription, and credits stay valid for one year from the date of purchase.
Frequently asked questions
How do the two subtitle routes differ?
On the browser route, neither the audio nor the transcript leaves your machine, and there is no length limit. Choosing the server engine instead takes up to 18 credits for ten minutes up front, settles on actual usage and refunds the difference.
Does it detect the spoken language?
It listens first and works out the spoken language. If you already know the language, selecting it in the subtitle menu is more accurate (the selectable languages are Korean, English, Japanese, German, Spanish, French, Portuguese and Chinese) — picking the wrong one makes the model invent words that were never said.
Can finished subtitles be translated?
Yes, into nine language tracks: Korean, English, Japanese, German, Spanish, French, Portuguese, Simplified Chinese and Traditional Chinese. The original track stays in place, and translating needs Chrome 138 or newer.
Does translation need a particular browser?
Chrome 138 or newer. On older versions a notice appears and the translation menu does nothing.
What does the server engine cost?
A length-based ceiling is taken up front: up to 2 credits for one minute, 9 for five, 18 for ten and 53 for thirty, then it is recalculated on actual usage and the difference is refunded. Thirty minutes is the maximum length per run.
Why do subtitle timings run long?
HFLUX tightens subtitle timings to the actual speech so captions do not stay on screen longer than the audio.
Where do the subtitles end up?
They go into a subtitle track on the timeline, ready to burn into the video or edit further. Translated tracks are kept separately, so each language can be used on its own. The subtitle menu also exports SRT or WebVTT files and imports SRT or WebVTT.