Converting recorded file in JS to WAV to pass as parameter to python file in PHP

Asked Nov 27 '20 at 01:22

Active Nov 27 '20 at 01:22

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I have a voice recorder in Javascript, and the recorded output is accessed through its url in php and passed into a python file to be used by the speech_recognition library for a text conversion like so:

$aud = $_FILES['audio_data']['tmp_name'];
$output = shell_exec('python ImageToText.py '. $aud.' 2>&1');

But I get this error:

ValueError: Audio file could not be read as PCM WAV, AIFF/AIFF-C, or Native FLAC; check if file is corrupted or in another format

Some research revealed that it's because the recording is in webm format, and further research revealed that I can use sox to convert audio from one form to another. I wanted to know if there was a way to do this in php to pass a WAV file to the python file or if there was any other way to do this. Thank you.

asked Nov 27 '20 at 01:22

Dre Day

The error message clearly states that `Audio file could not be read as PCM WAV`. – Danilo Ivanovic Nov 27 '20 at 01:38
yeah, don't know how to resolve it. – Dre Day Nov 27 '20 at 01:43
You can't WAV is not supported by the developers. – Danilo Ivanovic Nov 27 '20 at 01:44
oh okay, and can you help in converting to a format that is ? – Dre Day Nov 27 '20 at 01:48
Which library are you using? – Danilo Ivanovic Nov 27 '20 at 01:50
speech_recognition in python to convert the audio to text – Dre Day Nov 27 '20 at 01:52
I just now read the doc for that library, WAV is supported but it must be in PCM/LPCM format. How are you acquiring the recording? WebM is clearly not supported. Hence that's why you are getting the error. – Danilo Ivanovic Nov 27 '20 at 01:56
the audio is acquired as a blob of type audio/mp3 in my javascript file – Dre Day Nov 27 '20 at 01:58
You can pass blob to your python code then use this answer to convert it to WAV. https://stackoverflow.com/q/42288607/7637448 – Danilo Ivanovic Nov 27 '20 at 02:10
Thanks a lot. I'll check it out and see. – Dre Day Nov 27 '20 at 02:11
If you want I can write a full answer to this question using the advice given in the link. – Danilo Ivanovic Nov 27 '20 at 02:14
That would be appreciated. – Dre Day Nov 27 '20 at 02:26

Converting recorded file in JS to WAV to pass as parameter to python file in PHP

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