Ok, I've installed GStreamer. What can I do next?
First of all, verify that you have a working installation and that you can inspect plugins by typing
$ 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", you haven't installed GStreamer correctly. Please check how to get GStreamer If this fails with any other message, we would appreciate a bug report.
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:
$ gst-launch-1.0 -v fakesrc silent=false num-buffers=3 ! fakesink silent=false
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)
(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
autovideosink doesn't work, try an element that's specific for your
operating system and windowing system, such as
or (on windows)
Can my system play sound through GStreamer?
You can test this by trying to play a sine tone. For this, you need to link the audiotestsrc element to an output element that matches your hardware. A (non-complete) list of output plug-ins for audio is
pulsesinkfor Pulseaudio output
alsasinkfor ALSA output
oss4sinkfor OSS/OSSv4 output
jackaudiosinkfor JACK output
autoaudiosinkfor automatic audio output selection
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
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
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 headphones.
How can I see what GStreamer plugins I have on my system?
To do this you use the gst-inspect command-line tool, which comes standard with GStreamer. Invoked without any arguments,
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
will give you information about the volume plugin.
Where should I report issues?
Issues are tracked in Freedesktop.org's Gitlab at https://gitlab.freedesktop.org/gstreamer. Using Gitlab you can view past issues, report new issues, submit merge requests etc. Gitlab requires you to create an account there, which might seem cumbersome, but allows us to at least have a chance at contacting you for further information, as we will often have to do.
How should I report bugs?
When doing a bug report, you should at least describe
your distribution, distribution version and GStreamer version
how you installed GStreamer (from git, source, packages, which?)
if you installed GStreamer before
If the application you are having problems with is segfaulting, then 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. For example, to play a file you could just use
gst-launch-1.0 playbin uri=file:///path/to/song.mp3
You can also use
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
To automatically detect and select the right decoder for a given encoded stream in a pipeline, try any of the following:
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
Or even something more complicated like:
gst-launch-1.0 filesrc location=my-random-media-file.mpeg !decodebin name=decoder \ decoder. ! queue ! videoconvert ! xvimagesink \ decoder. ! queue ! audioconvert ! pulsesink
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 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
Additional examples can be found in the
gst-launch manual page.
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