I've successfully run this nodejs demo from my local machine with the supplied .raw file. Now I would like to use my own file, which started as a .wav file which I converted using the following sox command (as per step 3 of the google speech troubleshoot page):
sox resources/my-audio.wav --channels=1 --bits=16 --rate=16000 --endian=little resources/my-audio.flac
However I am still getting an empty response from google (no transcript, no error) when I try with my-audio.flac. I can play the flac file just fine on my machine.
Any suggestions?
Figured it out... turns out the sox command to convert the wav on the support page isn't quite right. Here is the command that worked for me:
sox resources/my-audio.wav \
--channels=1 \
--bits=16 \
--rate=16000 \
--encoding=signed-integer \
--endian=little resources/my-audio.raw
The two key differences with my original command were (1) add the --encoding=signed-integer (thanks to this) and (2) use the .raw extension on the output filename.