Re: Audio I/O parameters

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On Sat, 6 Jul 2013, James Stone wrote:

> The output when I try to start jack with 128 frames/period is:
> 
> /usr/bin/jackd -dalsa -r44100 -p128 -n2 -D -Chw:USB,0 -Phw:USB,0 -I512 -O512 -S
> jackdmp 1.9.9.5
> Copyright 2001-2005 Paul Davis and others.
> Copyright 2004-2012 Grame.
> jackdmp comes with ABSOLUTELY NO WARRANTY
> This is free software, and you are welcome to redistribute it
> under certain conditions; see the file COPYING for details
> no message buffer overruns
> no message buffer overruns
> no message buffer overruns
> JACK server starting in realtime mode with priority 10
> audio_reservation_init
> Acquire audio card Audio0
> creating alsa driver ... hw:USB,0|hw:USB,0|128|2|44100|0|0|nomon|swmeter|-|16bit
> Using ALSA driver USB-Audio running on card 0 - Focusrite Scarlett 2i4
> USB at usb-0000:00:12.2-3, high speed
> configuring for 44100Hz, period = 128 frames (2.9 ms), buffer = 2 periods
> ALSA: final selected sample format for capture: 32bit integer little-endian
> ALSA: use 2 periods for capture
> ALSA: final selected sample format for playback: 32bit integer little-endian
> ALSA: use 2 periods for playback
> ^CJack main caught signal 2
> 
> ..the device is unusable with the lights flashing on and off. Jack
> then shuts down as seen above.
> 
> At 256 frames/period it starts OK.

What happens if you run JACK with input only, no audio out?

Alan Stern

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