Re: Multichannel audio playback (was: Multichannel audio listening)
Le 27/04/2021 à 22:08, Jeremy Nicoll a écrit : On Tue, 27 Apr 2021, at 19:45, didier gaumet wrote: [...] b) https://mediadl.musictribe.com/media/sys_master/h7e/hfb/8849567252510.pdf your audio interface is a stereo one: it has only two channels (Left +Right) as outputs. I'm not sure that's true; [...] Even if there are 3 groups of output, they all play the same thing, a stereo signal. I think that's true of the "MAIN OUTPUT" but I'm not sure it also applies to the "PLAYBACK OUTPUTS". [...] You may well be right: reading again the pdf, I think I replied too hastily :-)
Re: Multichannel audio playback (was: Multichannel audio listening)
On Tue, Apr 27, 2021 at 10:22:11AM -1000, Joel Roth wrote: > > ecasound -i:libsndfile,audiofile -o alsa that should be -i:sndfile -- Joel Roth
Re: Multichannel audio playback (was: Multichannel audio listening)
On Tue, Apr 27, 2021, Rodolfo Medina wrote: > Four years ago this interesting thread. Now I've purchased a Behringer > UMC404HD 4-channels audio interface and finally want to do my experiment. Now > I have a 3-channel .wav file and 3 loudspeakers connected to Behringer's > output: I want to playback each channel to a different speaker. I get error: > > $ ecasound -i 3canali.wav -f:16,3,44100 -o alsahw,2,0 > ** > *ecasound v2.9.1 (C) 1997-2014 Kai Vehmanen and others > ** > (eca-chainsetup) Chainsetup "untitled-chainsetup" > (eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges > ... to utilize real-time scheduling (SCHED_FIFO). With small buffersizes, > ... this may cause audible glitches during processing. > (eca-chainsetup) "rt" buffering mode selected. > ERROR: Connecting chainsetup failed: "Enabling chainsetup: AUDIOIO-WAVE: > ... Only WAVE_FORMAT_PCM and WAVE_FORMAT_IEEE_FLOAT are supported." Hi Rodolfo, As didier gaumet writes, 3canali.wav is not one of ecasound's supported formats. You should find out what it is. Maybe try file 3canali.wav Also, ecasound can use libsndfile to expand the range of compatible audiofiles for reading and writing. ecasound -i:libsndfile,audiofile -o alsa If the extension doesn't match the file format, you can specify the file type, e.g. ecasound -i:libsndfile,audiofile,aiff -o alsa cheers -- Joel Roth
Re: Multichannel audio playback (was: Multichannel audio listening)
On Tue, 27 Apr 2021, at 19:45, didier gaumet wrote: > I might be wrong (I don't mix nor record) but I think there are two > distinct problems: > > a) the wav file you generated is not supported by ecasound because its > type (codec) is neither (L)PCM nor IEEE_FLOAT > https://en.wikipedia.org/wiki/WAV > So, either you produce a wav file encoded in LPCM to use ecasound, or > you use another tool than ecasound that supports the codec you used to > produce your wav file I'd want to use some other tool - "sox" perhaps - to verify that the file really does contain three channels of audio. Can, say, the three channels be selected one at a time and played back without using the Behringer box? I'd also need to be convinced that the alsa part of the command that someone posted did actually access the correct channels and try to send them somewhere. I'd probably want to try to use something else - maybe "sox" - to send test tones to three named places (as far as alsa is concerned) on the PC before trying to find out which of those arrived properly at the audio interface. > b) https://mediadl.musictribe.com/media/sys_master/h7e/hfb/8849567252510.pdf > your audio interface is a stereo one: it has only two channels (Left > +Right) as outputs. I'm not sure that's true; look at https://d1aeri3ty3izns.cloudfront.net/media/25/259085/download_259085.pdf (which is the second pdf linked to from https://www.gear4music.com/Recording-and-Computers/Behringer-U-PHORIA-UMC404HD-Audio-Interface/1WMY?gclid=EAIaIQobChMIheDYlJKf8AIVgQWiAx0ldgK6EAAYASAAEgI13fD_BwE ) which clearly states that the box can stream 4 inputs / 4 outputs. The PDF you linked to is one of those very annoying manuals that describe many different units, and it's very hard to understand what any single unit can do. Worse, there's no schematic showing where signals can flow to & from. I also looked at an Amazon listing for the box, but it had the same problem - people's comments applied to various different models. Although it does seem to support 4 separate outputs, these might be just copies of the signals supplied on the 4 mic/line inputs (so if one was using this box to record a couple of singers and guitarists - ie 4 inputs in all - copies of those signals could be played back to the performers). On the other hand there's a MIX control which appears to change how signals coming from the 4 inputs are mixed with those (from a PC?) that are being played back. Maybe if that's turned all the way to the PB position audio channels from the PC would be directed to the playback outputs? > Even if there are 3 groups of output, they all play > the same thing, a stereo signal. I think that's true of the "MAIN OUTPUT" but I'm not sure it also applies to the "PLAYBACK OUTPUTS". > As a sidenote: are we speaking of the same thing? Inputs are called > tracks. You could for example have 4 mono tracks for a rock band > (1:singer, 2:guitar, 3:bass, 4:drums) and each of these tracks are mixed > and panned to 2 outputs (Left and right) that are called channels. This unit has no pan controls, so panning the 4 inputs to positions on a stereo image must be something done by mixing software on a PC. That makes the buttons that refer to stereo/mono more confusing, as the box itself has no concept of stereo. Does it follow that the box sends 4 inputs to a PC, and the PC might send back either/both copies of those 4 inputs and a mixed stereo image? -- Jeremy Nicoll - my opinions are my own.
Re: Multichannel audio playback (was: Multichannel audio listening)
Le 27/04/2021 à 17:30, Rodolfo Medina a écrit : Joel Roth writes: On Mon, Mar 05, 2018 at 10:39:19AM +0100, Rodolfo Medina wrote: Hi all. After learning, some months ago, thanks to listers' help, how to live record into a multi channel audio file, I was wondering about the reverse problem: now I have my multi channel audio file, e.g. composed by three different channels. Is it possibile (I guess it is), and how?, to send each of the three outputs into a different loud speaker and so listen to the song...? Hi Rodolfo, Ecasound is pretty convenient for routing audio. If you connect three powered speakers to the first three channels of a (sufficiently capable) soundcard and you're using ALSA (the default low-level linux audio API), it's pretty simple: For example, ecasound -i:3ch.wav -f:16,3,44100 -o:alsa,default Four years ago this interesting thread. Now I've purchased a Behringer UMC404HD 4-channels audio interface and finally want to do my experiment. Now I have a 3-channel .wav file and 3 loudspeakers connected to Behringer's output: I want to playback each channel to a different speaker. I get error: $ ecasound -i 3canali.wav -f:16,3,44100 -o alsahw,2,0 ** *ecasound v2.9.1 (C) 1997-2014 Kai Vehmanen and others ** (eca-chainsetup) Chainsetup "untitled-chainsetup" (eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges ... to utilize real-time scheduling (SCHED_FIFO). With small buffersizes, ... this may cause audible glitches during processing. (eca-chainsetup) "rt" buffering mode selected. ERROR: Connecting chainsetup failed: "Enabling chainsetup: AUDIOIO-WAVE: ... Only WAVE_FORMAT_PCM and WAVE_FORMAT_IEEE_FLOAT are supported." Please help whoever can. One more thing: on the back of Behringer there are two groups of `playback outputs': group A and group B. Each of the two groups has 4 holes: 2 black 6.35mm, one red RCA and one white RCA. Please help also to understand how to use them for my special purpose. Besides, on Behringer's back there is one more group of outputs called `Main Out' and including two 6.35mm and two XLR. Thanks in advance for any help, Rodolfo Hello Rodolfo, I might be wrong (I don't mix nor record) but I think there are two distinct problems: a) the wav file you generated is not supported by ecasound because its type (codec) is neither (L)PCM nor IEEE_FLOAT https://en.wikipedia.org/wiki/WAV So, either you produce a wav file encoded in LPCM to use ecasound, or you use another tool than ecasound that supports the codec you used to produce your wav file b) https://mediadl.musictribe.com/media/sys_master/h7e/hfb/8849567252510.pdf your audio interface is a stereo one: it has only two channels (Left +Right) as outputs. Even if there are 3 groups of output, they all play the same thing, a stereo signal. Basically, I imagine that a typical situation would be to have a mixer or a Public Address (PA) system on MAIN, and 2 different paris of active monitors on A and B. If you want a 3 channels output, you need tou use a multichannel hardware, or tinker with 2 stereo interfaces As a sidenote: are we speaking of the same thing? Inputs are called tracks. You could for example have 4 mono tracks for a rock band (1:singer, 2:guitar, 3:bass, 4:drums) and each of these tracks are mixed and panned to 2 outputs (Left and right) that are called channels.
Multichannel audio playback (was: Multichannel audio listening)
Joel Roth writes: > On Mon, Mar 05, 2018 at 10:39:19AM +0100, Rodolfo Medina wrote: >> Hi all. >> >> After learning, some months ago, thanks to listers' help, how to live record >> into a multi channel audio file, I was wondering about the reverse problem: >> now I have my multi channel audio file, e.g. composed by three different >> channels. Is it possibile (I guess it is), and how?, to send each of the >> three outputs into a different loud speaker and so listen to the song...? >> > > Hi Rodolfo, > > Ecasound is pretty convenient for routing audio. > > If you connect three powered speakers to the first three > channels of a (sufficiently capable) soundcard and you're > using ALSA (the default low-level linux audio API), it's > pretty simple: > > For example, > > ecasound -i:3ch.wav -f:16,3,44100 -o:alsa,default Four years ago this interesting thread. Now I've purchased a Behringer UMC404HD 4-channels audio interface and finally want to do my experiment. Now I have a 3-channel .wav file and 3 loudspeakers connected to Behringer's output: I want to playback each channel to a different speaker. I get error: $ ecasound -i 3canali.wav -f:16,3,44100 -o alsahw,2,0 ** *ecasound v2.9.1 (C) 1997-2014 Kai Vehmanen and others ** (eca-chainsetup) Chainsetup "untitled-chainsetup" (eca-chainsetup) NOTE: Real-time configuration, but insufficient privileges ... to utilize real-time scheduling (SCHED_FIFO). With small buffersizes, ... this may cause audible glitches during processing. (eca-chainsetup) "rt" buffering mode selected. ERROR: Connecting chainsetup failed: "Enabling chainsetup: AUDIOIO-WAVE: ... Only WAVE_FORMAT_PCM and WAVE_FORMAT_IEEE_FLOAT are supported." Please help whoever can. One more thing: on the back of Behringer there are two groups of `playback outputs': group A and group B. Each of the two groups has 4 holes: 2 black 6.35mm, one red RCA and one white RCA. Please help also to understand how to use them for my special purpose. Besides, on Behringer's back there is one more group of outputs called `Main Out' and including two 6.35mm and two XLR. Thanks in advance for any help, Rodolfo
