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Matthew Clark
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README.md
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README.md
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# GStreamer command-line cheat sheet
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This series of docs provides a cheat sheet for GStreamer on the command-line.
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[GStreamer](https://gstreamer.freedesktop.org/) is a powerful library for manipulating audio and video - including live streams. This repo provides:
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A few Python examples are also [included](python_examples/) for when you need GStreamer to be dynamic (i.e. react to user or some other action).
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* a cheat sheet for GStreamer on the command-line, and
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* a few [Python examples](python_examples/).
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Whilst the command line is great, programmatic usage (in Python or another language) allows you to dynamically manipulate the A/V streams.
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## Contents
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* [Installing](installing.md)
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* [Basics](basics.md)
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* [Test streams](test_streams.md)
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* [RTMP](rtmp.md)
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@ -21,16 +25,15 @@ A few Python examples are also [included](python_examples/) for when you need GS
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## Sources and references
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* [Basic command line reference](http://docs.gstreamer.com/display/GstSDK/Basic+tutorial+10%3A+GStreamer+tools)
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* [Basic command line reference](https://gstreamer.freedesktop.org/documentation/tutorials/basic/gstreamer-tools.html?gi-language=c)
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* [Pipeline examples](https://gstreamer.freedesktop.org/documentation/tools/gst-launch.html#pipeline-examples)
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* [List of all Gstreamer plugins](https://gstreamer.freedesktop.org/documentation/plugins.html)
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* [List of all Gstreamer plugins](https://gstreamer.freedesktop.org/documentation/plugins_doc.html?gi-language=c)
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* [Handy elements](https://gstreamer.freedesktop.org/documentation/tutorials/basic/handy-elements.html#uridecodebin)
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## Other cheat-sheets
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* http://wiki.oz9aec.net/index.php/Gstreamer_cheat_sheet
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* https://github.com/xmementoit/gstreamerCheatsheet/blob/master/README.md
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* https://gist.github.com/nebgnahz/26a60cd28f671a8b7f522e80e75a9aa5
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* <https://github.com/xmementoit/gstreamerCheatsheet/blob/master/README.md>
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* <https://gist.github.com/nebgnahz/26a60cd28f671a8b7f522e80e75a9aa5>
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## Interacting with the GStreamer pipeline
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@ -64,4 +67,4 @@ If you spot anything incorrect or incomplete, reports are welcome, either using
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# My GStreamer project
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Creating this guide gave me enough GStreamer understanding to make [Brave](https://github.com/bbc/brave), a live video editor for the cloud.
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Creating this guide gave me enough GStreamer understanding to make a prototype [Brave](https://github.com/bbc/brave), a live video editor for the cloud. (Regrettably this prototype has not been updated in a few years.)
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10
basics.md
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basics.md
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# Basics (GStreamer command-line cheat sheet)
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## Playing content
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These examples assume that bash variable `SRC` to be set to a video file (e.g. an mp4 file). You can do this by, e.g.
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export SRC=/home/me/videos/test.mp4
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```
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### Play a video (with audio)
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The magical element `playbin` can play anything:
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decodebin ! videoconvert ! videoscale ! autovideosink
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```
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### Play a video (no audio)
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```
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! autovideosink
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```
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### Play just the audio from a video
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```
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### Add filters
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Go slightly mad:
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Here's the 'vertigo' filter:
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```
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! videoconvert ! vertigotv ! autovideosink
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Try also ‘rippletv’, ‘streaktv’, ‘radioactv’, ‘optv’, ‘quarktv’, ‘revtv’, ‘shagadelictv’, ‘warptv’ (I like), ‘dicetv’, ‘agingtv’ (great), ‘edgetv’ (could be great on real stuff)
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### Add A clock
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### Add a clock
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```
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gst-launch-1.0 -v filesrc location="$SRC" ! decodebin ! clockoverlay font-desc="Sans, 48" ! videoconvert ! autovideosink
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### Change framerate
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Changing framerate is quiet common, as the world does not have a consistent standard. Facebook Live wants 30fps, YouTube wants 30 or 60fps. There's a nice summary on the [Apple FCP site](https://documentation.apple.com/en/finalcutpro/usermanual/index.html#chapter=D%26section=4%26tasks=true).
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Changing framerate is quiet common, as the world does not have a consistent standard. Facebook Live wants 30fps, for example.
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Change framerate:
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50
installing.md
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installing.md
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# Installing (GStreamer command-line cheat sheet)
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## Packages
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Installing GStreamer is not enough. GStreamer is built on a large number of plugins, which are split into four packages:
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* *Base*: Reliable, commonly used, high-quality plug-ins
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* *Good*: Additional plug-ins that are also reliable and high-quality
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* *Bad*: Plugins that are potentially unreliable
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* *Ugly*: Plugins that may bring concerns, often around licensing
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(Full definition of these packages [in this readme](https://gitlab.freedesktop.org/gstreamer/gstreamer/-/blob/main/subprojects/gst-plugins-bad/README.md).)
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You can choose which you install - you'll almost certainly need base, and potentially the others.
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You can see which package a plugin belongs in the [Plugins API reference](https://gstreamer.freedesktop.org/documentation/plugins_doc.html?gi-language=c).
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You can get a list of all installed plugins with:
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```
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gst-inspect-1.0
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```
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## Installing on MacOS
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The easiest way to install on MacOS is using Homebrew. There is a [GStreamer](https://formulae.brew.sh/formula/gstreamer) package, and additional packages for the base/good/bad/ugly plugins.
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Example:
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```
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brew install gstreamer gst-plugins-base gst-plugins-good
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```
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There are many dependencies so this can take time to run!
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You can also compile and install yourself - see (https://gstreamer.freedesktop.org/documentation/installing/on-mac-osx.html).
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## Installing on Ubuntu Linux
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The GStreamer APT packages are excellent.
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For a good install command, see `https://gstreamer.freedesktop.org/documentation/installing/on-linux.html?gi-language=c`.
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## Installing on other platfoms
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See (https://gstreamer.freedesktop.org/documentation/installing/index.html?gi-language=c)
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