"Vovsoft Speech to Text Converter" supports IBM Cloud Speech to Text API which can convert up to 500 minutes per month for free.
In order to obtain your API key and URL, please follow these steps:
Enter your API key and URL into the Settings panel inside "Vovsoft Speech to Text Converter". The software is now ready to convert audio to text.
For most languages, the IBM Cloud service supports both broadband and narrowband models:
Choosing the correct model is important. Use the model that matches the sampling rate (and language) of your audio. The service automatically adjusts the sampling rate of your audio to match the model that you specify.
HTTP/1.1 503 Service Unavailable
Your URL is wrong. Please enter the exact "API Key" and "URL" that was supplied for you by IBM Cloud.
Error reading data: (12152)
Your audio is too long. Please try to convert a shorter audio.