capture system audio?

[Tom Horsley]

I'm playing a video in firefox and want to capture the audio.

There are a maze of web pages about audio capture, all different.
None of the ones I've tried work. They all give the impression they
are capturing audio, but the resulting audio files are nothing
but silence.

Has anyone successfully captured audio from firefox on fedora 33?

[Jonathan Ryshpan]

On Tue, 2021-02-23 at 13:09 -0500, Tom Horsley wrote:
> I'm playing a video in firefox and want to capture the audio.
>
> There are a maze of web pages about audio capture, all different.
> None of the ones I've tried work. They all give the impression they
> are capturing audio, but the resulting audio files are nothing
> but silence.
>
> Has anyone successfully captured audio from firefox on fedora 33?

Assuming you run PulseAudio, the tools that you want are Pavucontrol
and Audacity.  Pavucontrol controls the paths through which sound moves
in the PulseAudio system.  Audacity records it.  Both are pretty
intuitive.  When you start Firefox it will show up as a source in
Pavucontrol, similarly Audacity will show up as a sink.

jon

[Tom Horsley]

On Tue, 23 Feb 2021 13:00:06 -0800
Jonathan Ryshpan wrote:
> Assuming you run PulseAudio, the tools that you want are Pavucontrol
> and Audacity.

Thanks. I'll give audacity a try next time I need this. I already used
the Pavucontrol tool with gnome-sound-recorder but never got any
audio. Also tried ffmpeg which never recorded any audio using any
of the instructions I found.

[Jack Craig]

video downloadhelper has been working well for me, YMMV,...

On Tue, Feb 23, 2021 at 1:01 PM Jonathan Ryshpan 
wrote:
> On Tue, 2021-02-23 at 13:09 -0500, Tom Horsley wrote:
> > I'm playing a video in firefox and want to capture the audio.
> >
> > There are a maze of web pages about audio capture, all different.
> > None of the ones I've tried work. They all give the impression they
> > are capturing audio, but the resulting audio files are nothing
> > but silence.
> >
> > Has anyone successfully captured audio from firefox on fedora 33?
>
> Assuming you run PulseAudio, the tools that you want are Pavucontrol
> and Audacity.  Pavucontrol controls the paths through which sound moves
> in the PulseAudio system.  Audacity records it.  Both are pretty
> intuitive.  When you start Firefox it will show up as a source in
> Pavucontrol, similarly Audacity will show up as a sink.
>
> jon
>
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[Samuel Sieb]

On 2/23/21 1:00 PM, Jonathan Ryshpan wrote:
> On Tue, 2021-02-23 at 13:09 -0500, Tom Horsley wrote:
> > I'm playing a video in firefox and want to capture the audio.

I've explained the details below about how to capture local audio, but 
as Jack mentioned, it might be easier to download the source video and 
extract the audio directly from that.
> > There are a maze of web pages about audio capture, all different.
> > None of the ones I've tried work. They all give the impression they
> > are capturing audio, but the resulting audio files are nothing
> > but silence.
> >
> > Has anyone successfully captured audio from firefox on fedora 33?
>
> Assuming you run PulseAudio, the tools that you want are Pavucontrol
> and Audacity.  Pavucontrol controls the paths through which sound moves
> in the PulseAudio system.  Audacity records it.  Both are pretty
> intuitive.  When you start Firefox it will show up as a source in
> Pavucontrol, similarly Audacity will show up as a sink.

In audacity, click the record monitor so it opens a connection.  Then in 
pavucontrol, go to the recording tab.  Beside the entry for audacity 
will be a dropdown.  The actual text depends on your audio device, but 
you want to select the "monitor of" entry.  If you have something 
playing, you should see the volume monitor bar moving.

[stan]

On Tue, 23 Feb 2021 13:09:39 -0500
Tom Horsley  wrote:
> I'm playing a video in firefox and want to capture the audio.
>
> There are a maze of web pages about audio capture, all different.
> None of the ones I've tried work. They all give the impression they
> are capturing audio, but the resulting audio files are nothing
> but silence.
>
> Has anyone successfully captured audio from firefox on fedora 33?

obs should work, though I've never captured without both video and
audio.  Once you have the captured file, you can extract the audio with
mplayer, ffmpeg, or import it to audacity and then export the audio as
a new file.

[Roger Heflin]

I have fullscreened firefox and used OBS to capture both the video and
the audio, it seems to have worked correctly.

On Wed, Feb 24, 2021 at 8:29 PM stan via users
 wrote:
> On Tue, 23 Feb 2021 13:09:39 -0500
> Tom Horsley  wrote:
> > I'm playing a video in firefox and want to capture the audio.
> >
> > There are a maze of web pages about audio capture, all different.
> > None of the ones I've tried work. They all give the impression they
> > are capturing audio, but the resulting audio files are nothing
> > but silence.
> >
> > Has anyone successfully captured audio from firefox on fedora 33?
>
> obs should work, though I've never captured without both video and
> audio.  Once you have the captured file, you can extract the audio with
> mplayer, ffmpeg, or import it to audacity and then export the audio as
> a new file.
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[Tim]

On Tue, 2021-02-23 at 13:09 -0500, Tom Horsley wrote:
> I'm playing a video in firefox and want to capture the audio.

There's the brute force and ignorance method:  Connect a 3.5 mm patch
lead between line out to line in, and record the line in signal.

Obviously there can be some quality losses doing it this way, but they
may be insignificant to you.  And it gets around all technical attempts
to stop you copying the sound.