AVAudioRecorder: Speed up playback speed of recording? (Not playback with speed with AVAudioPlayer)

Asked Apr 16 '19 at 08:07

Active Apr 16 '19 at 08:07

Viewed 101 times

I am trying to transcript a long recorded audio file with SFSpeechRecognizer. Unfortunately it seems to run in real time, e.g. if the audio file is 1 min long, SFSpeechRecognizer will take 1 min to transcript it.

I have not found an option yet to speed it up. I know that AVAudioPlayer has an option for speed, but I am wondering if speeding up the recorded file with AVAudioRecorder is possible?

asked Apr 16 '19 at 08:07

MJQZ1347

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No, it is not possible. There are different speech recognition APIs which process the audio faster. – Nikolay Shmyrev Apr 16 '19 at 13:11
Thanks! Which ones would you recommend @NikolayShmyrev? – MJQZ1347 Apr 16 '19 at 14:12
Google API is easiest to start probably, its paid though. – Nikolay Shmyrev Apr 16 '19 at 14:19
For anyone wondering. Tested it on https://cloud.google.com/speech-to-text with an audio file, it is not considerabley faster making a switch worthwhile @NikolayShmyrev – MJQZ1347 Apr 18 '19 at 23:03
From my experience it is much faster (LongRunningRecognize), you can probably try with the API, webpage is just for demo. – Nikolay Shmyrev Apr 18 '19 at 23:05

AVAudioRecorder: Speed up playback speed of recording? (Not playback with speed with AVAudioPlayer)

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