PulseAudioになってからずっとやり方が分からず悩んでいたデスクトップの音のキャプチャですが、今回ようやく実現出来ました。

まず、下の画像にあるように、「Sources」のoutput.monitorという名前を覚えておきます。これが出力音声で、今回キャプチャしようとしている音です。

次に、PulseAudioDeviceChooserにてDefaultSourceを上記のoutput.monitorに変更します。

そしてgtk-recordMyDesktopの設定で、音のデバイスに「pulse」を指定します。

後は録画するだけ！ これでデスクトップ上の音をキャプチャできます。スクリーンキャプチャでデスクトップ上の音を録音したい時に便利ですね。

もちろん、デスクトップの音をキャプチャせずとも、他のデバイスを選択することもできます。

私の環境では、サウンドカード以外にWebカメラ、キャプチャボードが入力デバイスとして認識されております（デフォルトはWebカメラにしてます）。それらを自由に切り替えて使うことができます。出力も同様です。

Prerequisites: I assume you’ve set up your sound card already and properly at that too. If not, it’s a good idea to perform that now. Try alsaconfig for that. It serves me well. Also, I’m on a Debian Lenny. If you’re on a different system you may consider this howto as a collection of hints, but the actual process might work differently on your system.

As for most of my howtos, I tinkered with the issue at one box to figure things out, then went to an alternative box to make a clean setup there too. The latter serves as a warranty that my howto will actually work, and on alternative machines also.

First, I indeed tried out several desktop motion (video) grabbers before I decided to use gtk-recordMyDesktop. Though its error messages are far off of being helpful. Tinkering around and Google finally enabled me to get the desktop grabbed to a video file and microphone input grabbed at the same time to the same file. Until now, I didn’t get gtk-recordMyDesktop to natively fetch input from /dev/dsp, so I opted for using jackd as an audio input source instead.

Here’s the overview:

1. Install Jack
2. Launch Jack
3. Install gtk-recordMyDesktop
4. Configure gtk-recordMyDesktop (And Fix What aptitude Left Alone)
5. Record Your Screencast
6. Peek Into Your Recording

Install Jack

There are two alternatives for using jackd, either as root or as user. Both have their trade-offs.

Running jackd as root implies that you can have jackd in real-time mode, but then gtk-recordMyDesktop cannot use it as audio input. So, then, you have to run gtk-recordMyDesktop as root as well.

On the other hand, running jackd as an ordinary user denies you the real-time mode, though using gtk-recordMyDesktop doesn’t need to be run a root either. Actually, I opted for the latter.

The minimum of required packages to run jackd as a daemon is to have these packages installed: libjack0, jackd. Therefore, perform as root:

# aptitude install libjack0 jackd

If you’ve got KDE installed, libjack0 will likely be there already.
 

Launch Jack

Once done with installing the necessary parts of Jack, fire it up:

$ jackd -d alsa -d hw -H
jackd 0.109.2
Copyright 2001-2005 Paul Davis and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

JACK compiled with System V SHM support.
loading driver ..
creating alsa driver ... hw|hw|1024|2|48000|0|0|hwmon|swmeter|-|32bit
configuring for 48000Hz, period = 1024 frames (21.3 ms), buffer = 2 periods
ALSA: final selected sample format for capture: 16bit little-endian
ALSA: use 2 periods for capture
ALSA: final selected sample format for playback: 16bit little-endian
ALSA: use 2 periods for playback

Of the options, -d alsa -d hw I took from the config file set up by aptitude, /etc/default/jackd. In that file, there’s one other option given, -R. That is for real-time mode and will work only when root launches jackd. On the other hand, that -H is new: I added it to make use of hardware monitoring. You may omit that.

If you get that output shown above or a similar one, everything is going well. — If it’s not, here’s a hint: Jack does not like to be run when any other program occupies the hardware it wants to use, namely that ominous hw:0 thingy it keeps to mention. You get around that by quitting every other sound using tool and, sadly, KDE. Some inobvious service of KDE seems to keep occupying that hw:0 thingy. So, to get around this, I installed XFCE; Gnome will probably do also. The important thing, with regards to gtk-recordMyDesktop, is that whatever desktop environment you choose, it must have a tray around.

You may want to background the jackd process, so alternatively start it with a & appended, and redirect its output to some log file:

$ jackd -d alsa -d hw -H > jackd.log 2>&1 &

Install gtk-recordMyDesktop

Next, let’s go for the actual desktop grabbing.

You need gtk-recordMyDesktop, so let’s install it:

# aptitude install gtk-recordmydesktop

Now just launch it:

$ gtk-recordMyDesktop

Configure gtk-recordMyDesktop (And Fix What aptitude Left Alone)

Then, in the initial screen, hit the wide button labeled Advanced. Then another window recordMyDesktop: Advanced pops up. There, open the Sound tab, and there tick the [_] Use Jack for audio capture. check box. In the box below, labeled Available Ports, there should be a bunch of Jack ports being offered. (If not, it’s a Jack issue, not a gtk-recordMyDesktop one. Go back to Jack installation and tinker around with jack_lsp -p which must give you some output in order to get that choice at that gtk-recordMyDesktop box.)

So, pick some capture ports from that selection, close the recordMyDesktop: Advanced window, go back to thee gtk-recordMyDesktop main window, and hit the Record button. There you go. — Well…. I’ve seen a box that indeed could go from here, but on my main box I usually get a 3584 error (see? helpful error messages?) complaining it could not load some Jack library, and mentioning even more technical innards regarding stuff. — I figured out that that just means gtk-recordMyDesktop cannot access ‘the’ Jack shared library at all, that libjack0 package we just installed. The issue’s to be found here:

# ll /usr/lib/libjack.so*
lrwxrwxrwx 1 root root    17 16. Jan 21:51 /usr/lib/libjack.so.0 -> libjack.so.0.0.28
-rw-r--r-- 1 root root 64200 10. Jan 19:09 /usr/lib/libjack.so.0.0.28
# 

There should be a /usr/lib/libjack.so there as well, but obviously is not. Somehow, aptitude didn’t provide that. Though, we can get around this, we just set a another symbolic link to /usr/lib/libjack.so.0.0.28 just like /usr/lib/libjack.so.0 does. As root, we say:

# ln -s /usr/lib/libjack.so.0.0.28 /usr/lib/libjack.so

Et voila, there it is:

# ll /usr/lib/libjack.so*
lrwxrwxrwx 1 root root    26 17. Mär 05:44 /usr/lib/libjack.so -> /usr/lib/libjack.so.0.0.28
lrwxrwxrwx 1 root root    17 16. Jan 21:51 /usr/lib/libjack.so.0 -> libjack.so.0.0.28
-rw-r--r-- 1 root root 64200 10. Jan 19:09 /usr/lib/libjack.so.0.0.28
# 

Record Your Screencast

Try again the screen recording, i.e. hit Record again — and there we go, finally. The gtk-recordMyDesktop dialog withdraws to the tray where it waits as an inconspicuous lightgrey square…recording. Click that square, and the recording will finish and the gtk-recordMyDesktop dialog will re-appear.

By default, your grabbed desktop video would go to ~/out*.ogv, but you can tell gtk-recordMyDesktop where else to save the session. If you want to do so, the Save As button is for you.

Peek Into Your Recording

If you want to peek into what you just recorded, xine might be a good first-glance tool for you.

El video del post anterior fue grabado con gtk-recordmydesktop, que es un programa que nos permite hacer videos de nuestro escritorio, con todo y sonido ;O, para nunca lo había usado y me resultó muy fácil instalarlo:

sudo aptitude install gtk-recordmydesktop

Luego lo abrimos y para mi caso, no puse sonido y le puse una calidad media..

gtk-recordmydesktop

Podemos incluso sólo grabar una ventana seleccionada, pero yo grabé todo el escritorio, luego simplemente presionamos el boton Grabar y listo. Para terminar la grabación hay que ir a la barra de menús, al lado derecho y ahí esta la opción de terminar.

Otra cosa que me gustó fue la calidad y el peso del archivo, no me metí a configurar mucho el gtk-recordmydesktop y solo le bajé un poco la clalidad, pero el video se ve bien, y no pesaba mucho, lo subi a youtube en unos minutos.

El archivo esta en .ogv (Ogg Video) y fue detectado por youtube, asi que si quieren subir un video al youtube, todo se puede hacer sin que se realice una conversión de formato por el usuario.

I’ve just been playing with recording my desktop on ubuntu hardy.

I didn’t spend very long on this – but the fact that the first two applications I tried didn’t work at all suggests that writing something don’t might be mildly useful.

The applications I tried were

* istanbul

* byzanz

* gtk-recordMyDesktop

Out of these gtk-recordMyDesktop was the only one to work adequately – though I managed to think it wasn’t working for a while.

The problems I encountered:

• byzanz only produced animated GIFs and had a tendency to stop recording after short lengths of time (like seven seconds)
• instanbul would produce videos which would frequently become entirely black – only showing a few frames of the recorded video

gtk-recordMyDesktop seemed to work fairly well however it confused me quite a lot at first. Its dialog has a Save As button that must be pressed before recording – this meant for a while I was convinced that the application wasn’t producing output, or was using the previous filename I entered to produce output. I guess I’m just rather slow. In gtk-recordMyDesktop’s defence I didn’t actually read anything about it before attempting to use it. Perhaps Save As should be changed to Select save path.

Summary for the impatient

If you want to record on Ubuntu, gtk-recordMyDesktop seems to work adequately. Though you have to click the Save As button to specify the save-path before clicking the record button. Also, to stop recording you have to click a stop button that will (probably unbeknownst to you) appear in your system tray after you start recording.

istanbul didn’t work – but this may well be something to do with my machine – or something to do with ubuntu’s distributed version. I don’t mean to malign its makers.

Bom galera, agora que estou de óculos novos, e percebendo o rápido crescimento de visitantes ao meu blog estou voltando a ativa .

De começo queria passar a vocês o novo endereço do blog, registrei um domínio, que está em construção atualmente, e criei um sub-domínio redirecionando para o blog, estou com ótimos projetos em relação a isso e você leitor também se beneficiará de tudo, o endereço para acesso:

blog.marcelofabio.net

Bom deixando o velho blá blá blá de lado vamos agora ao que interessa realmente, como gravar um video tutorial no linux, com essa nova impolgação resolvi agora criar video aulas para disponibilizar à vocês, então vou postar os programas que achei em minha pesquisar e quais achei mais legais

Vou começar pelo istanbul, comfesso que foi um dos que achei mais legais e melhor configurável apesar de ter dado alguns erros e até fechado do nada foi o que me ofereceu uma melhor configuração e é o que usarei para fazer as video aulas, para instala-lo digite:

$sudo apt-get install istanbul

ele aparece ao lado dos ícones do relógio, do desligar e etc (no gnome), é uma bola vermelha, para ter acesso as opções em cima dele clique com o botão direito, o legal é que ele tem opção de gravar efeitos 3D como o do compiz. Muito interessante e é o que indico.

Tem também o gtk-recordmydesktop, também um ótimo para mim se ele gravasse perfeitamente efeitos 3D seria minha indicação, por ser leve nunca ter dado nenhum bug comigo, ele foi o que obteve maior performance também. Bom caso você queria só gravar o desktop sem usar por exemplo efeitos do compiz, realmente recomendo que use este, perfeito tem uma versão gráfica e uma modo texto, para usar o modo texto basta digitar no console:

$recordmydesktop

e as suas devidas opções. Para instalar digite:

$sudo apt-get install gtk-recordmydesktop

gtk-recordmydesktop

Lembrando que os dois gravam no formato ogg.

Bem pessoal é isso, apesar de ter testado outros os que indico são esses, até a próxima, e vem video aulas por aí!

abraços a todos.

A cuento de que estoy preparando una charla sobre el software libre en las empresas (invitado por Manuel77), he tenido que capturar un vídeo desde mi propio escritorio, es decir, he capturado un vídeo de lo que yo iba manejando y haciendo en mi pantalla.

Esto es muy fácil de hacer en Debian (y derivadas Ubuntu, LinEx, GuadaLinEx…), tan sólo necesitamos instalar un paquete llamado: gtk-recordmydesktop. En Debian está disponible para Debian Lenny, y lógicamente para la versión Sid (unstable).

Esta es la información del paquete en cuestión:
(#dpkg – p gtk-recordmydesktop)

Para instalarlo:

Esta aplicación es muy útil para capturar lo que sucede en nuestro escritorio, grabar tutoriales, alguna explicación, conversaciones o videoconferencias…

Lo mejor, es que la salida de video está en formato .ogg (formato de video libre). Si lo queremos pasar a .avi o cualquier otro formato, ya sabéis cómo utilizar ffmpeg o mencoder, sino echad un vistazo a este otro post que explica cómo hacerlo.

$mencoder video.ogg -o video.avi -ovc lavc -oac mp3lame

Aquí tenéis el ejemplo de una captura de mi escritorio.

This is a test video of my desktop using gtk-recordMyDesktop.
You can install it by running the following command: sudo apt-get install gtk-recordmydesktop. Make sure you have the universe repositories enabled in your ubuntu sources.
The video was originally recorded in OGG format but was converted to MP4 to upload to youtube.

recordMyDesktop es una herramienta para grabar lo que sucede en nuestro escritorio (ScreenCast) , mayormente es usada para grabar tutoriales sobre algo, grabar los actos de otros usuarios en nuestros ordenadores o incluso grabar conversaciones en tiempo real en muchos Protocolos, Como bien dice el dicho “Más vale una imagen que 1000 palabras”, con recordMyDesktop podemos grabar todo lo que sucede.

¿Cómo usarlo?

Es simple, para instalarlo en Ubuntu/Debian tan solo debemos acceder a su website oficial donde nos indica donde podemos encontrar los paquetes para nuestra distribucción, para la gente que no entiende mucho en Inglés o no se aclara o simplemente lo quiere más facil aquí dejo los enlaces para las principales distribucciones de Linux.

ArchLinux:

ArchLinux Users Repository

Debian Sarge:

http://apt.linex.org/linex2006/dists/cl/gnulinex/

openSUSE:

recordMyDesktop gtk-recordMyDesktop

Ubuntu Feisty/Gutsy:

http://www.getdeb.net/app.php?name=RecordMyDesktop

(Para usuarios de Ubuntu/Debian podeis usar (Ex: sudo apt-get install recordMyDesktop gtk-recordMyDesktop)

Adicionalmente se puede encontrar recordMyDesktop ya instalado en las siguientes distribuciones:

Cualquier duda, pues como siempre, dejadla en comentarios e intentaré ayudar.