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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?
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-launch-1.0 playbin uri=file:///path/to/song.mp3
```
gst-play-1.0 song.mp3
You can also use `gst-play`:
or
```
gst-play-1.0 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 use:
To decode an mp3 audio file and play it through Pulseaudio, you could also use
```
gst-launch-1.0 filesrc location=thesong.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink
```
gst-launch-1.0 filesrc location=thesong.mp3 ! decodebin ! audioconvert ! pulsesink
To automatically detect and select the right decoder for a given encoded stream
in a pipeline, try any of the following:
or
```
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=thesong.mp3 ! mpegaudioparse ! mpg123audiodec ! audioconvert ! pulsesink
Or even something more complicated like:
. More examples can be found in the gst-launch man page.
To automatically detect the right codec in a pipeline,
try
gst-launch-1.0 filesrc location=my-random-media-file.mpeg ! decodebin !
pulsesink
.
or
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
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg !decodebin name=decoder \
decoder. ! queue ! videoconvert ! xvimagesink \
decoder. ! queue ! audioconvert ! pulsesink
```
We also have a basic media playing plugin that will take care of most
things for you. This plugin is called playbin. Try
this:
Building from the previous example, you can let GStreamer select an appropriate
set of default sinks by replacing the specific output elements with these automatic
alternatives:
gst-launch-1.0 playbin uri=file:///home/joe/my-random-media-file.mpeg
```
gst-launch-1.0 filesrc location=my-random-media-file.mpeg !decodebin name=decoder \
decoder. ! queue ! videoconvert ! autovideosink \
decoder. ! queue ! audioconvert ! autoaudiosink
```
This should play the file if the format is supported, ie. you have all
the necessary demuxing and decoding and some output plugins installed.
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
```
Additional examples can be found in the `gst-launch` manual page.