Convert mp4 to webm for streaming audio

[edisonmoy]

Problem

typescript-streaming-sandbox Prosody and Vocal bursts features displays the following error on Safari:

Streaming payload configured with model type 'prosody', which is not supported for the detected file type 'text'.

Chrome defaults to audio/webm. Safari defaults to audio/mp4

Solution

Convert audio/mp4 to audio/webm format in AudioRecorder before returning the audio blob.

Note: It is necessary to import and initialize ffmpeg-wasm in the class to prevent the server execution of ffmpeg-wasm

Error: ffmpeg.wasm does not support nodejs

Testing

Manual tests of Prosody, Vocal bursts on MacOS Chrome and MacOS Safari.