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faq: using: improve command line section

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Group and reorder examples logically and add a short on note
about auto sinks. Rework text as needed.
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Reynaldo H. Verdejo Pinochet 2017-08-15 15:12:44 -07:00
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markdown/frequently-asked-questions/using.md
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@ -114,49 +114,62 @@ provide us with the necessary gdb output. See
## How do I use the GStreamer command line interface? ## How do I use the GStreamer command line interface?
You access the GStreamer command line interface using the command You access the GStreamer command line interface using the command
`gst-launch-1.0`. To play a file you could just use `gst-launch-1.0`. For example, to play a file you could just use
gst-play-1.0 song.mp3
or
```
gst-launch-1.0 playbin uri=file:///path/to/song.mp3 gst-launch-1.0 playbin uri=file:///path/to/song.mp3
```
To decode an mp3 audio file and play it through Pulseaudio, you could also use You can also use `gst-play`:
gst-launch-1.0 filesrc location=thesong.mp3 ! decodebin ! audioconvert ! pulsesink ```
gst-play-1.0 song.mp3
```
or To decode an mp3 audio file and play it through Pulseaudio, you could use:
```
gst-launch-1.0 filesrc location=thesong.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink gst-launch-1.0 filesrc location=thesong.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink
```
. More examples can be found in the gst-launch man page. To automatically detect and select the right decoder for a given encoded stream
in a pipeline, try any of the following:
To automatically detect the right codec in a pipeline, ```
try gst-launch-1.0 filesrc location=thesong.mp3 ! decodebin ! audioconvert ! pulsesink
```
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin ! pulsesink
```
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin ! videoconvert ! xvimagesink
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin ! Or even something more complicated like:
pulsesink
. ```
or gst-launch-1.0 filesrc location=my-random-media-file.mpeg !decodebin name=decoder \
decoder. ! queue ! videoconvert ! xvimagesink \
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin !
videoconvert ! xvimagesink
Something more
complicated:
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin name=decoder
decoder. ! queue ! videoconvert ! xvimagesink
decoder. ! queue ! audioconvert ! pulsesink decoder. ! queue ! audioconvert ! pulsesink
```
We also have a basic media playing plugin that will take care of most Building from the previous example, you can let GStreamer select an appropriate
things for you. This plugin is called playbin. Try set of default sinks by replacing the specific output elements with these automatic
this: alternatives:
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg !decodebin name=decoder \
decoder. ! queue ! videoconvert ! autovideosink \
decoder. ! queue ! audioconvert ! autoaudiosink
```
GStreamer also provides `playbin`, a basic media-playback plugin that
automatically takes care of most playback details. The following example shows
how to play any file as long as its format is supported, ie. you have the
necessary demuxing and decoding plugins installed:
```
gst-launch-1.0 playbin uri=file:///home/joe/my-random-media-file.mpeg gst-launch-1.0 playbin uri=file:///home/joe/my-random-media-file.mpeg
```
This should play the file if the format is supported, ie. you have all Additional examples can be found in the `gst-launch` manual page.
the necessary demuxing and decoding and some output plugins installed.