On Wed, 31 Jan 2018 08:40:47 -0600
dev <devua...@gmail.com> wrote:

> I have some online classes which are Flash based "webinars" that I'd
> like to save for viewing on my train/bus commute. gtk-recordmydesktop
> works for the video part but I can't record any audio. I'm using
> straight ALSA on my Devuan system and tried setting
> gtk-recordmydesktop audio option to PCM and DEFAULT but no good.

With pure ALSA (and bridged mic/speaker connectors), this works fine for

$ avconv -f x11grab -show_region 1 \
         -s 1024x768 -i :0.0+60,80 \
         -f alsa -i hw:0,0 \
         -c:v libx264 -c:a libmp3lame \
         -y outfile.mpg

IIRC, ALSA allows to create a loopback device (kernel module), from
which digital audio can be grabbed directly.

libre Grüße,

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