Media Server 25.3
Media Server Help

# ModelVersion

The model to use to convert speech into text.

- `Legacy` uses the IDOL 12.x speech-to-text models. When you choose this option you can configure custom language models and custom word databases.

- The following options use a new speech-to-text algorithm that was introduced in IDOL 23.2. These provide much better out-of-the-box accuracy than the legacy models, especially for English speech. Custom language models are not supported, because the vocabulary of these models is not limited by their training.

  - The `micro` model is the fastest of the new models. Use this model if you want to prioritize speed over accuracy, or if you need to process live streams without GPU acceleration.
  - The `small` model provides a good balance between accuracy and performance for English speech.
  - The `medium` model provides a significant increase in accuracy for non-English speech and a modest increase in accuracy for English, at the cost of greater memory requirements and longer processing times.
  - The `large` model provides maximum accuracy for non-English speech. This model is not available for English. If you specify English (for example by setting LanguagePack to `ENUK`), Media Server uses the medium model instead.

Type: | String
Default: | Legacy
Required: | No
Configuration Section: | TaskName
Example: | `ModelVersion=small`
See Also: |

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Version 25.3 | Last updated July 2025

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Product: Knowledge Discovery Media Server 25.3

Topic Title: ModelVersion