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Im trying to use IBM speech to text API to transcript the audio in messenger to text script.

request({
        uri: attachment.url,
        method: 'GET',
        encoding: null
      }, (err, res, audio) => {... do something...}

I use request to get the audio file from the url I get in message. But I can only get w4a file, Watson only supports

audio/flac

audio/wav

audio/l16

audio/ogg

How do I convert w4a format audio to wav to fit the spec.

Or there exists other way to do that?

thanks.

Community
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Wu Jhao Cheng
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    The keywords to look for are "nodejs" and "ffmpeg". Something like http://stackoverflow.com/questions/33725893/how-do-you-use-node-js-to-stream-an-mp4-file-with-ffmpeg – Nikolay Shmyrev May 23 '16 at 18:43
  • It is actually a watson question, so we need to add watson tag to get the right attention – Gireesh Punathil Jun 08 '16 at 09:20
  • this is really a question about audio conversion, the audio formats supported by the Watson STT service are listed here: https://www.ibm.com/watson/developercloud/doc/speech-to-text/input.html note that webm is also supported – Daniel Bolanos Jun 01 '17 at 22:15

1 Answers1

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Use a package like audiobuffer-to-wav to convert your source audio file(.w4a) to Watson STT compatible format like mp3/wav, then use the converted file with Watson STT API. And, If you need to use this library server side, you can emulate AudioContext functionality with web-audio-api package.

Varun
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