> On Mon, Mar 17, 2014 at 09:46:25PM +0000, James Courtier-Dutton wrote: >On 17 March 2014 14:30, Roger <rogerx.oss@xxxxxxxxx> wrote: >> I keep getting the following error whenever specifying -c 1 or --channels=1, or >> specifying any number of channels less than two channels when using an ASUS >> Essence STX soundcard and recording using the microphone line having a TRS >> jack. (Whether using the rear or front/case microphone jack.) >> >> $ arecord --device=hw:0,0 --format S16_LE --rate 44100 -c1 /tmp/test.wav >> >> arecord: set_params:1239: Channels count non available >> >This due to one of two reasons: >1) The hardware cannot do it. >2) The hardware can do it, but the device driver has not implemented >support for it yet. I'm guessing the later, the driver is hard coded, so people recording using the line-in input avoid the problem of only being able to record the left channel. Hard-coding for recording both channels, and then requiring users to strip or merge the right channel with the left channel later. >Have you tried using plug devices or the default >e.g >arecord --device=plughw:0,0 --format S16_LE --rate 44100 -c1 /tmp/test.wav > >This will give you 1 channel, and alsa lib will do the down-mixing 2->1 for you. Exactly one answer I was looking for. A quick substitution via arecord to just record mono, whether or not using downmixing, as I was already trying within the dot asoundrc file. Verified Audacity does show only one track within the /tmp/test.wav, and likely can now also stuff something into a dot asoundrc file using the above example, but will likely use a Bash alias within the .bashrc file. alias arecord-mic-2s="arecord --channels=1 --device=plughw:0,0 --duration=2 --format S16_LE --rate 48000 --vumeter=mono /tmp/test.wav && aplay /tmp/test.wav" Works like a charm! Thanks! -- Roger http://rogerx.freeshell.org/ ------------------------------------------------------------------------------ Learn Graph Databases - Download FREE O'Reilly Book "Graph Databases" is the definitive new guide to graph databases and their applications. Written by three acclaimed leaders in the field, this first edition is now available. Download your free book today! http://p.sf.net/sfu/13534_NeoTech _______________________________________________ Alsa-user mailing list Alsa-user@xxxxxxxxxxxxxxxxxxxxx https://lists.sourceforge.net/lists/listinfo/alsa-user
