[clug] Recording screencasts on Linux?

Maurie May mauriemay at gmail.com
Fri Jul 19 23:23:12 MDT 2013

Have just been reading the May 2013 edition of Linux Format magazine. They
have an article on Kazam, which seem to tick all the boxes you are after.

On 18 July 2013 15:06, Ian Munsie <darkstarsword at gmail.com> wrote:

> >> The best that I can find so far is ffmpeg, as detailed here:
> >> http://nienhueser.de/blog/?p=469 . RecordMyDesktop looks good but it
> seems
> >> to have had no development since 2008.
> >
> > Works just fine. Does audio - but I suspect just Desktop sounds (teeraw
> > might work).  If I remember correctly you need to set the name of the
> > saved file and it's location before starting the recording. Output is
> ogg.
> First, I'd recommend using the gtk-recordmydesktop frontend rather
> than recordmydesktop directly (unless you want to script it). It
> pretty much is a one click solution and seems to work pretty well
> whenever I've used it in the past.
> I did notice that I had to open it's advanced settings and change the
> device in Sound tab from "DEFAULT" to "default" for it to work, and
> obviously the Sound recording checkbox should be enabled on the main
> interface, but other than that just optionally select a window to
> record (which isn't working for me in i3, but that did used to work
> when I used in wmii so that might just be a window manager issue),
> then hit record. It minimises to the statusbar - simply right click to
> pause/resume, left click to stop.
> It looks like the sound recording in recordmydesktop uses ALSA, so
> that means (honestly the defaults will probably just work so long as
> you select the Sound checkbox in gtk-recordmydesktop and changed the
> device to "default" - if this looks like too much text to read just
> try it and only read this is the audio didn't work):
> 1. If you DO NOT have pulseaudio installed it will record from
> whatever input stream from your sound card ALSA is set to capture from
> - probably a microphone (or occasionally nothing at all, in which case
> you may need to tweak things in alsamixer's capture tab). Depending on
> your sound card you may or may not be able to record desktop sounds,
> though nowadays this is actually pretty rare since it requires the
> loop back done in hardware on the sound card.
> 2. If you DO have pulseaudio (and the appropriate ALSA hooks which
> your distro should have taken care of for you) you can use pavucontrol
> tool (you may need to install this as it is often packaged separately
> from pulseaudio) to select where the audio is being routed from:
> a) On the Configuration tab you select what mode your sound device[s]
> is in (The defaults are usually fine, though it should generally
> include the word "Duplex" i.e. both Input and Output work
> simultaneously). If you are using another audio device such as a USB
> microphone or Bluetooth headset you should check that it's mode is
> sensible for recording (Bluetooth devices cannot record in A2DP, for
> example).
> b) On the Input Devices tab you select which input to use on each
> device for recording. The default may be correct, but you should check
> in case it's selected the wrong input (My laptop has a built-in
> microphone, a microphone jack on the side and a microphone jack on the
> docking station). You should be able to see the volume monitor on this
> tab moving up and down as you make noises if you selected the right
> one.
> c) When the application actually opens the sound device for recording,
> it will appear in the Recording tab. Let me say that again - the
> stream WILL NOT APPEAR on this tab until you actually start recording
> with the application! If pulseaudio recognises the application it will
> try to assign whatever recording device was used last time to it
> (assuming the device is still present and enabled), so if you do a
> test run and set it correctly you shouldn't need to change it when you
> start recording for real.
> One warning - the options that start with "Monitor of ..." are for
> recording the sound being sent to the device - i.e. that is how you
> would record desktop sounds. If you are recording from a microphone
> you want to make sure that you have not accidentally selected the
> monitor entry.
> The one thing I don't know how to do in pulseaudio, is how to get it
> to mix two streams together (say if you wanted to mix both the
> microphone input and an output monitor simultaneously). Anyone else on
> list know how to do that?
> Cheers,
> -Ian
> --
> http://sites.google.com/site/DarkStarJunkSpace
> --
> http://darkstarshout.blogspot.com/
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