On Fri, November 6, 2020 7:22 am, John Murphy wrote: > I think I've discovered where my levels were going awry. I was using > timemachine to record in w64 format and converting to wav. Now, using: > > jack_capture -s --channels 2 --port system:capture* -d 10 -f w64 t1w64.w64 > \ > & jack_capture -s --channels 2 --port system:capture* -d 10 -f wav > t1wav.wav > > then: > > sox --no-clobber -S t1w64.w64 -b 16 t2wav.wav > > Then sox stat shows min/max amplitude +/- 0.5 for the wav capture and > +/- 0.9 for the wav converted from w64. The converted file looks good > in my editor too. The w64 vs. wav file thing is not relevant unless you are recording for more than a couple of hours at a time. The important distinction is that jack_capture records as single precision floating point values by default, and the "-b 16" argument to sox converts to 16 bit integer PCM. What does sndfile-info show about t1w64.w64 and t2wav.wav files? I tried using sox to convert a float file I had in an Ardour project directory to PCM, and sndfile-info reported the exact same maximum value for both. Using the sox stat effect also displayed the same maximum and minimum for original and converted file as well, but sndfile-info might give you some insight into why sox did not seem to show the same value. -- Chris Caudle _______________________________________________ Linux-audio-user mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx https://lists.linuxaudio.org/listinfo/linux-audio-user
