Speech to Text Workflow Operation

ID: speechtotext


The speech to text operation can be used to generate subtitles for Videos or Audio files. Currently, there is only Vosk available as STT Engine. The subtitles file format ist WebVTT.

Parameter Table

configuration keys required description
source-flavor yes The source media package to use
target-flavor yes Flavor of the produced subtitle file
target-element no Define where to append the subtitles file. Possibilities are: as a 'track' or as an 'attachment'. The default is "attachment".
language-code no The language of the video or audio source (default is "eng). It has to match the name of the language model directory. See 'vosk-cli'.
target-tags no Tags for the subtitle file


In order for it to work, you have to install the vosk-cli package. Installation instructions can be found at github.com/elan-ev/vosk-cli.

Operation Examples

If you want to display the subtitles in the Paella player, the WebVTT files have to be published and the target SubFlavor has to be configured like this: vtt+LANG, where LANG is the language option, that will be displayed in the Paella player. Please note the description above for the language-code field.

    description="Generates subtitles for video and audio files">
    <configuration key="source-flavor">*/source</configuration>
    <configuration key="target-flavor">captions/vtt+en</configuration>
    <configuration key="target-element">attachment</configuration>
    <configuration key="target-tags">archive,subtitle,engage-download</configuration>
    <configuration key="language-code">eng</configuration>