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faq: using: add missing markup

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Reynaldo H. Verdejo Pinochet 2017-08-15 15:57:15 -07:00
parent 42cf3fbe80
commit 66698184c6
1 changed files with 33 additions and 19 deletions
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52
markdown/frequently-asked-questions/using.md
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@ -5,7 +5,9 @@
First of all, verify that you have a working installation and that
you can inspect plugins by typing
$ gst-inspect-1.0 fakesrc
```
$ gst-inspect-1.0 fakesrc
```
This should print out a bunch of information about this particular
element. If this tells you that there is "no such element or plugin",
@ -15,28 +17,33 @@ would appreciate a [bug report](#using-bugs-where).
It's time to try out a few things. Start with gst-launch and two
plug-ins that you really should have : fakesrc and fakesink. They do
nothing except pass empty buffers. Type this at the command-line
:
nothing except pass empty buffers. Type this at the command-line:
$ gst-launch-1.0 -v fakesrc silent=false num-buffers=3 ! fakesink silent=false
```
$ gst-launch-1.0 -v fakesrc silent=false num-buffers=3 ! fakesink silent=false
```
This will print out output that looks similar to this :
This will print out output that looks similar to this:
RUNNING pipeline ...
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 0) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 0) 0x8057510"
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 1) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 1) 0x8057510"
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 2) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 2) 0x8057510"
execution ended after 5 iterations (sum 301479000 ns, average 60295800 ns, min 3000 ns, max 105482000 ns)
```
RUNNING pipeline ...
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 0) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 0) 0x8057510"
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 1) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 1) 0x8057510"
fakesrc0: last-message = "get ******* (fakesrc0:src)gt; (0 bytes, 2) 0x8057510"
fakesink0: last-message = "chain ******* (fakesink0:sink)lt; (0 bytes, 2) 0x8057510"
execution ended after 5 iterations (sum 301479000 ns, average 60295800 ns, min 3000 ns, max 105482000 ns)
```
(Some parts of output have been removed for clarity) If it looks
similar, then GStreamer itself is running correctly.
To get a test video displayed, try:
$ gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink
```
$ gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink
```
If `autovideosink` doesn't work, try an element that's specific for your
operating system and windowing system, such as `ximagesink` or `glimagesink`
@ -62,14 +69,17 @@ First of all, run gst-inspect-1.0 on the output plug-in you want to use
to make sure you have it installed. For example, if you use Pulseaudio,
run
$ gst-inspect-1.0 pulsesink
```
$ gst-inspect-1.0 pulsesink
```
and see if that prints out a bunch of properties for the plug-in.
Then try to play the sine tone by
running
$ gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink
```
$ gst-launch-1.0 audiotestsrc ! audioconvert ! audioresample ! pulsesink
```
and see if you hear something. Make sure your volume is turned up, but
also make sure it is not too loud and you are not wearing your
@ -80,12 +90,16 @@ headphones.
To do this you use the gst-inspect command-line tool, which comes
standard with GStreamer. Invoked without any arguments,
$ gst-inspect-1.0
```
$ gst-inspect-1.0
```
will print out a listing of installed plugins. To learn more about a
particular plugin, pass its name on the command line. For example,
$ gst-inspect-1.0 volume
```
$ gst-inspect-1.0 volume
```
will give you information about the volume plugin.