Language & Translation¶

Aboleth STT supports all languages recognized by the underlying Whisper model. You can lock recognition to a specific language for faster, more accurate results, or use auto-detection to let Whisper identify the language from the audio.

Translation from any supported language to English is also available with multilingual models.

Setting the Language¶

C++Blueprint

UAbolethSTTSubsystem* STT = UAbolethSTTSubsystem::GetSTTSubsystem(this);

// Auto-detect language from audio (default)
STT->SetLanguage("auto");

// Lock to a specific language
STT->SetLanguage("en");   // English
STT->SetLanguage("de");   // German
STT->SetLanguage("ja");   // Japanese
STT->SetLanguage("es");   // Spanish

// Check current language
FString Current = STT->GetLanguage();  // Returns "auto", "en", etc.

Call Set Language on the Subsystem with a language code string ("auto", "en", "de", etc.). Use Get Language to read the current setting.

Lock the language when you know it

Setting a specific language code (e.g. "en") instead of "auto" skips the language detection step and produces faster, more accurate results. Use "auto" only when the input language is genuinely unknown.

API Reference¶

Function	Description
`SetLanguage(FString)`	Set recognition language (`"auto"` or a language code)
`GetLanguage()`	Get the current language code
`GetAvailableLanguages()`	Returns all language codes supported by Whisper (static)

Listing Available Languages¶

Call GetAvailableLanguages() to retrieve the full list of supported language codes at runtime:

C++Blueprint

TArray<FString> Languages = UAbolethSTTSubsystem::GetAvailableLanguages();
for (const FString& Code : Languages)
{
    UE_LOG(LogTemp, Log, TEXT("Supported: %s"), *Code);
}

Call Get Available Languages (static) to get an array of language code strings.

Translation to English¶

Whisper can translate non-English speech directly to English during transcription. This runs as part of the same inference pass -- no separate translation step is needed.

C++Blueprint

UAbolethSTTSubsystem* STT = UAbolethSTTSubsystem::GetSTTSubsystem(this);

// Enable translation (speak German, get English text)
STT->SetTranslateToEnglish(true);

// Check if translation is enabled
bool bTranslating = STT->GetTranslateToEnglish();

Call Set Translate to English (true) on the Subsystem. Use Get Translate to English to check the current state.

Function	Description
`SetTranslateToEnglish(bool)`	Enable or disable translation to English
`GetTranslateToEnglish()`	Check if translation is active

Requires a multilingual model

Translation only works with multilingual Whisper models (e.g. ggml-large-v3-turbo-q5_0.bin). English-only models (filenames ending in .en) do not support translation and will ignore this setting.

Project Settings¶

Language defaults are configured in Project Settings > Aboleth Speech-to-Text > Language:

Setting	Default	Description
Language	`auto`	Language code for recognition, or `"auto"` for auto-detection
Translate to English	`false`	Translate non-English speech to English during transcription