Re: how to record sound to mp3 [wav, for those who can]
On Thu 25 Mar 2021 at 23:22:35 (+0100), Nicolas George wrote: > David Wright (12021-03-25): > > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > > This command does not record the sound being played. > > … on your machine. > > On no machine, unless specifically configured, which is not trivial at > all. I'm afraid it's my PCs that are making a liar of you. > It would be helpful if people around here learned to read carefully the > questions before trying to answer them. If they did, they would have > noticed that the question was not to record the ambient sound but the > sound BEING PLAYED. What, you think that I left the speakers running so that the microphone could record them? Or did you think that the sound of Thursday evening traffic in St John's Wood would carry across six timezones? Or you think that's it's impossible that I should have been able to record sound the computer is playing (from whatever source, external or internal) on an OOTB PC for over twenty years? Is that why you're shouting? Anyway, back to talking about PCs. > To achieve it requires either a hardware connection > between the output and the input of the sound controller That's my understanding. Using the terminology of the High Definition Audio Specification (Revision 1.0a June 17, 2010), there is presumably a link from the § 7.2.3.4 Mixer (Summing Amp) Widget output to the § 7.2.3.5 Selector (Multiplexer) Widget. This link in inside the Widget Interconnection "Cloud" of Figure 49, Module-Based Codec Architecture. "The exact number of possible inputs to each widget is determined by design;" (§ 7.1.1), which is why you can't just conjure up any facility on any PC. But the machine is no more "specifically" configured than any PC which has HDA and a mobo: the vendor (Intel on my old one, Dell on the new) decides how much of the architecture they will implement. And the modern way seems to be to go cheap, particularly with consumer-grade. OK, this one's a decent machine, but it's still a 10-yr old cast off. Perhaps take a look at the specification and see how much is left open to the vendor. Hence the need for scripts like alsa-info to tell you exactly what you've bought with any given "sound card". This PC was not cheap when it was bought, largely because it's supposed to be fast: it was bought for students to run geophysics programs on. You can now pick them up for just over $100. If I ever have to hand it back, I might just do that. It'll be the first computer I've ever bought. > or the > collaboration of the sound driver. I assume by this that you're talking about pulseaudio. That's why I've mentioned it each and every time. (This is the third—should I put it in my signature?) I can't advise how the OP might use it, because *I* don't¹. But perhaps that's not expected here—one just replies "pulseaudio" like the people saying "audacity" or "sox" or whatever. Finally, who's the audio expert round here? I posted what I think is a determining factor for just vanilla ALSA and the card to work with my command line. Presumably there's a definitive answer to this? Do *you* have it? ¹ self-imposed simplicity: no PA, no OSS. Cheers, David.
Re: how to record sound to mp3 [wav, for those who can]
On Fri, 26 Mar 2021 09:47:28 +0100
Michael Lange wrote:
> Plus, I don't know how to switch the OSS capture
> device programmatically (if this is important for the OP's purpose).
uh, got it.
$ aumix -v R
sets "Vol" as capture device.
Regards
Michael
.-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-.
A man either lives life as it happens to him, meets it head-on and
licks it, or he turns his back on it and starts to wither away.
-- Dr. Boyce, "The Menagerie" ("The Cage"), stardate
unknown
Re: how to record sound to mp3 [wav, for those who can]
Hi, On Fri, 26 Mar 2021 08:38:02 +0100 wrote: > On Thu, Mar 25, 2021 at 11:22:35PM +0100, Nicolas George wrote: > > David Wright (12021-03-25): > > > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > > > This command does not record the sound being played. > > > … on your machine. > > > > On no machine, unless specifically configured, which is not trivial at > > all. > > No idea about pulse. For ALSA, there's alsaloop, which comes with a > man page. Part of alsa-utils. No need of playing with cable loops. another possibility: when the snd-mixer-oss module is loaded, (at least here) when using the OSS mixer device there is a "Vol" control which roughly appears to be the OSS equivalent to Alsa's "Master" control, however the "Vol" control has an additional "Capture" switch. Now, when I set "Vol" as capture device, the audio output will be used as input for recording. Recording level can be adjusted with the "PCM" mixer control. Of course, the presence of this "Vol" control may depend on the sound card / driver in use. Oddly, there seems to be no such easy way to achieve the same result with alsamixer/amixer. Plus, I don't know how to switch the OSS capture device programmatically (if this is important for the OP's purpose). Regards Michael .-.. .. ...- . .-.. --- -. --. .- -. -.. .--. .-. --- ... .--. . .-. I thought my people would grow tired of killing. But you were right, they see it is easier than trading. And it has its pleasures. I feel it myself. Like the hunt, but with richer rewards. -- Apella, "A Private Little War", stardate 4211.8
Re: how to record sound to mp3 [wav, for those who can]
On Thu, Mar 25, 2021 at 11:22:35PM +0100, Nicolas George wrote: > David Wright (12021-03-25): > > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > > This command does not record the sound being played. > > … on your machine. > > On no machine, unless specifically configured, which is not trivial at > all. No idea about pulse. For ALSA, there's alsaloop, which comes with a man page. Part of alsa-utils. No need of playing with cable loops. > It would be helpful if people around here learned to read carefully the > questions before trying to answer them [...] (I was on the verge of making a snarky comment to that, but I'll bite my tongue). Cheers - t signature.asc Description: Digital signature
Re: how to record sound to mp3 [wav, for those who can]
David Wright writes: On Thu 25 Mar 2021 at 17:40:51 (+0100), Nicolas George wrote: > David Wright (12021-03-25): [...] > > To record, you could type, for example, in another xterm: > > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > This command does not record the sound being played. … on your machine. That's why I wrote "If you can't get ALSA to work…". You're a candidate for pulseaudio, I assume. Not sure about that command above (no means to try it just now), but _with_ PulseAudio, I can record the sound that is being played back just fine by means of "monitor" audio devices. E.g. I have the following command to record my screen (`0:v`), the "monitor" device (`1:a`) and a microphone (`2:a`): exec ffmpeg -video_size 1600x1200 -framerate 12 -f x11grab -i :0.0+0,0 -f pulse -ac 2 -i 0 -f pulse -i 1 -c:v libvpx-vp9 -deadline realtime -b:v 2M -c:a libvorbis -map 0:v -map 1:a -map 2:a "recording.webm" adapted from these two sources: -> https://trac.ffmpeg.org/wiki/Capture/Desktop -> https://askubuntu.com/questions/682144/capturing-only-desktop-audio-with-ffmpeg It may of course be true that the hardware _does_ support/accellerate this monitoring capability, but it does not seem to be entirely uncommon a feature? Here, it even works inside virtual machines :) Btw. the existence of monitor devices can be checked in `pavucontrol` where under "Output" it lists two monitor devices here: One for the HDMI output and one for the "Built-in Analog Stereo" Output. AFAICT, this recording facility is getting harder to find on most computers, if you're not prepared to fork out for a sound card. I've been fortunate, in that just as my ancient Pentium III expired, I have acquired a Dell Precision T3500 which has a well endowed (integrated) sound card. I'm still finding my way round it: for example, it also has HDMI playback, but I haven't yet worked out how to exploit it. The machine has one DVI output and two DisplayPorts, so I need to find a DisplayPort/HDMI adapter to see if that would yield anything. [...] As far as I can tell, DisplayPort can transport audio without the need for an HDMI adapter. Here, a Radeon Pro W5500 graphics card is connected to a Dell U2713HM display which has one HDMI, DP, VGA and DVI input each. The W5500 is connected to the DisplayPort and if I play sound to the "HDMI" output, the display outputs that sound through its headphones socket. Similar to your case, there are no HDMI ports on the graphics card. In my case, it is only DisplayPorts. HTH Linux-Fan öö pgpoa49bihnMC.pgp Description: PGP signature
Re: how to record sound to mp3 [wav, for those who can]
David Wright (12021-03-25): > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > This command does not record the sound being played. > … on your machine. On no machine, unless specifically configured, which is not trivial at all. It would be helpful if people around here learned to read carefully the questions before trying to answer them. If they did, they would have noticed that the question was not to record the ambient sound but the sound BEING PLAYED. To achieve it requires either a hardware connection between the output and the input of the sound controller or the collaboration of the sound driver. Regards, -- Nicolas George signature.asc Description: PGP signature
Re: how to record sound to mp3 [wav, for those who can]
On Thu 25 Mar 2021 at 17:40:51 (+0100), Nicolas George wrote: > David Wright (12021-03-25): > > > now i modify my requirement to how to use arecord to record sound being > > > played to wav file > > > To record, you could type, for example, in another xterm: > > > > $ arecord -d 10 -f cd -v -v -v -D plughw:0,0 /tmp/audiofile.wav > > This command does not record the sound being played. … on your machine. That's why I wrote "If you can't get ALSA to work…". You're a candidate for pulseaudio, I assume. AFAICT, this recording facility is getting harder to find on most computers, if you're not prepared to fork out for a sound card. I've been fortunate, in that just as my ancient Pentium III expired, I have acquired a Dell Precision T3500 which has a well endowed (integrated) sound card. I'm still finding my way round it: for example, it also has HDMI playback, but I haven't yet worked out how to exploit it. The machine has one DVI output and two DisplayPorts, so I need to find a DisplayPort/HDMI adapter to see if that would yield anything. It also has two Capture devices, and I don't know whether that means there are two independent sound paths. If so, then I should be able to record from the browser to one file, and from a TV (my UK one has headphone output) or the Roku remote control to another file at the same time. Anyway, I just recorded a bit of audio from Abbey Road (the live webcam¹, not the album), and printed the settings of all the controls (attached). AIUI at present, the critical section is at the end, specifically: Simple mixer control 'Input Source',0 Capabilities: cenum Items: 'Mic' 'Line' 'Stereo Mix' Item0: 'Stereo Mix' IOW, I'm recording from the mixer. ¹ https://www.abbeyroad.com/Crossing Cheers, David. Simple mixer control 'Master',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 31 [100%] [0.00dB] [on] Simple mixer control 'Headphone',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 39 Mono: Front Left: Playback 0 [0%] [-58.50dB] [on] Front Right: Playback 0 [0%] [-58.50dB] [on] Simple mixer control 'Speaker',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 31 Mono: Playback 0 [0%] [-46.50dB] [on] Simple mixer control 'Line',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-34.50dB] [on] Front Right: Playback 0 [0%] [-34.50dB] [on] Simple mixer control 'Line Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 0 [0%] [0.00dB] Front Right: 0 [0%] [0.00dB] Simple mixer control 'Line Out',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-46.50dB] [on] Front Right: Playback 0 [0%] [-46.50dB] [on] Simple mixer control 'Mic',0 Capabilities: pvolume pswitch Playback channels: Front Left - Front Right Limits: Playback 0 - 31 Mono: Front Left: Playback 0 [0%] [-34.50dB] [off] Front Right: Playback 0 [0%] [-34.50dB] [off] Simple mixer control 'Mic Boost',0 Capabilities: volume Playback channels: Front Left - Front Right Capture channels: Front Left - Front Right Limits: 0 - 3 Front Left: 0 [0%] [0.00dB] Front Right: 0 [0%] [0.00dB] Simple mixer control 'Beep',0 Capabilities: pvolume pvolume-joined pswitch pswitch-joined Playback channels: Mono Limits: Playback 0 - 15 Mono: Playback 0 [0%] [-45.00dB] [off] Simple mixer control 'Auto-Mute Mode',0 Capabilities: enum Items: 'Disabled' 'Speaker Only' 'Line Out+Speaker' Item0: 'Disabled' Simple mixer control 'Independent HP',0 Capabilities: enum Items: 'Disabled' 'Enabled' Item0: 'Disabled' Simple mixer control 'Loopback Mixing',0 Capabilities: enum Items: 'Disabled' 'Enabled' Item0: 'Disabled' Simple mixer control 'Capture',0 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 54 Front Left: Capture 44 [81%] [7.50dB] [on] Front Right: Capture 44 [81%] [7.50dB] [on] Simple mixer control 'Capture',1 Capabilities: cvolume cswitch Capture channels: Front Left - Front Right Limits: Capture 0 - 54 Front Left: Capture 33 [61%] [-9.00dB] [on] Front Right: Capture 33 [61%] [-9.00dB] [on] Simple mixer control 'Input Source',0 Capabilities: cenum Items: 'Mic' 'Line' 'Stereo Mix' Item0: 'Stereo Mix' Simple mixer control 'Input Source',1 Capabilities: cenum Items: 'Mic' 'Line' 'Stereo Mix' Item0: 'Line'
