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> Application Development Manual (0.10.36)</TH
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><A
NAME="section-checklist-applications"
>21.4. Utility applications provided with <SPAN
CLASS="application"
>GStreamer</SPAN
></A
></H1
><P
> <SPAN
CLASS="application"
>GStreamer</SPAN
> comes with a default set of command-line utilities that
can help in application development. We will discuss only
<B
CLASS="command"
>gst-launch</B
> and <B
CLASS="command"
>gst-inspect</B
> here.
</P
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="section-applications-launch"
>21.4.1. <B
CLASS="command"
>gst-launch</B
></A
></H2
><P
> <B
CLASS="command"
>gst-launch</B
> is a simple script-like commandline
application that can be used to test pipelines. For example, the
command <B
CLASS="command"
>gst-launch audiotestsrc ! audioconvert !
audio/x-raw-int,channels=2 ! alsasink</B
> will run
a pipeline which generates a sine-wave audio stream and plays it
to your ALSA audio card. <B
CLASS="command"
>gst-launch</B
> also allows
the use of threads (will be used automatically as required or as queue
elements are inserted in the pipeline) and bins (using brackets, so
<SPAN
CLASS="QUOTE"
>"("</SPAN
> and <SPAN
CLASS="QUOTE"
>")"</SPAN
>). You can use dots to imply
padnames on elements,
or even omit the padname to automatically select a pad. Using
all this, the pipeline
<B
CLASS="command"
>gst-launch filesrc location=file.ogg ! oggdemux name=d
d. ! queue ! theoradec ! ffmpegcolorspace ! xvimagesink
d. ! queue ! vorbisdec ! audioconvert ! audioresample ! alsasink
</B
> will play an Ogg file
containing a Theora video-stream and a Vorbis audio-stream. You can
also use autopluggers such as decodebin on the commandline. See the
manual page of <B
CLASS="command"
>gst-launch</B
> for more information.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="section-applications-inspect"
>21.4.2. <B
CLASS="command"
>gst-inspect</B
></A
></H2
><P
> <B
CLASS="command"
>gst-inspect</B
> can be used to inspect all properties,
signals, dynamic parameters and the object hierarchy of an element.
This can be very useful to see which <CODE
CLASS="classname"
>GObject</CODE
>
properties or which signals (and using what arguments) an element
supports. Run <B
CLASS="command"
>gst-inspect fakesrc</B
> to get an idea
of what it does. See the manual page of <B
CLASS="command"
>gst-inspect</B
>
for more information.
</P
></DIV
><DIV
CLASS="sect2"
><H2
CLASS="sect2"
><A
NAME="section-applications-gst-editor"
>21.4.3. GstEditor</A
></H2
><P
>
GstEditor is a set of widgets to display a graphical representation of a
pipeline.
</P
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