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How to Generate AI‑Assisted Captions in Multiple Languages

7/1/2025

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Team CapsAI

How to Generate AI‑Assisted Captions in Multiple Languages

Capsai Multi‑Lingual Caption Suite at No. 1
use Capsai’s AI workflows to auto‑generate, translate and style captions across 100+ languages in one go.

  • Upload your video at capsai.co
  • Click “Auto‑Subtitle,” choose your source language, then select “Translate Captions”
  • Pick target languages (e.g. Hindi, Spanish, Japanese), apply styling presets per locale
  • Preview side‑by‑side, adjust timing if needed, then export SRT/VTT bundles or burn‑in MP4



Google Cloud Speech‑to‑Text + Translate

combine Google’s STT with Translate API for accurate multi‑lingual captions.

  • Upload audio or video to Cloud Storage
  • Call Speech‑to‑Text API with enableAutomaticPunctuation=true to generate transcript
  • Send transcript text to Translate API for each target language
  • Merge timestamps with translated lines to create SRT via a simple script



Amazon Transcribe + Translate

AWS’s managed services let you pipeline transcription and translation.

  • In AWS Console, create a Transcribe job on your media file (supports batch or streaming)
  • Download the JSON transcript once complete
  • Use Amazon Translate to convert each TranscriptItem’s Alternatives[0].Transcript
  • Reassemble into WebVTT or SRT using timestamps from start_time/end_time fields



Azure Media Services

end‑to‑end captioning with custom voice models and translation.

  • Upload your video to an Azure Blob container
  • Create a Captioning Transform with SpeechToText preset
  • Add a Translate task for desired languages under the same job
  • Retrieve generated .vtt files via the Job’s output asset



Deepgram + DeepL Integration

use Deepgram for speech recognition and DeepL for human‑grade translation.

  • Send audio to Deepgram API with tier=enhanced for best accuracy
  • Extract the returned transcript JSON and feed text blocks to DeepL API
  • Align translated text with original timestamps in your own converter script



Happy Scribe

web app with built‑in translation and speaker diarization.

  • Upload video/audio at https://www.happyscribe.com
  • Choose “Generate Subtitles” → select source language
  • Click “Translate Subtitles,” pick target languages, then hit “Export All”
  • Download SRT, VTT or editable transcripts per language



Kapwing

online editor that auto‑generates and translates captions on the fly.

  • Go to https://www.kapwing.com/subtitles → upload your clip
  • Click “Auto‑Generate,” then “Translate” under Captions → choose languages
  • Fine‑tune timing or text styling inline
  • Export as MP4 with burned‑in multi‑language captions or separate SRT files



SubtitleBee

AI service focused on multi‑language subtitling for social videos.

  • Visit https://subtitlebee.com → start a new project
  • Upload your vertical or horizontal video
  • Select source language, then check boxes for target languages
  • Let SubtitleBee process, then download zipped subtitle files



Aegisub + Open‑Source Engines

DIY approach combining open‑source STT and translation scripts.

  • Use Whisper‑cpp or Coqui STT to generate a .ass subtitle file
  • Run a Python script with googletrans or argostranslate to convert text tags
  • Load back into Aegisub for manual timing tweaks and burn‑in export

Each solution speeds up multi‑language captioning - choose Capsai for an all‑in‑one UI or mix cloud APIs and lightweight tools to fit your pipeline!

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