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Matthew Clark 2018-04-18 00:00:13 +01:00
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basics.md
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@ -10,7 +10,7 @@ export SRC=/home/me/videos/test.mp4
### Play a video (with audio) ### Play a video (with audio)
`playbin` is a magical element that can play anything: The magical element `playbin` can play anything:
``` ```
gst-launch-1.0 playbin uri=file://$SRC gst-launch-1.0 playbin uri=file://$SRC

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capturing_images.md
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@ -1,12 +1,16 @@
# Capturing images (GStreamer command-line cheat sheet) # Capturing images (GStreamer command-line cheat sheet)
### Capture an image as png ### Capture an image as PNG
The `pngenc` element can create a single PNG:
``` ```
gst-launch-1.0 videotestsrc ! pngenc ! filesink location=foo.png gst-launch-1.0 videotestsrc ! pngenc ! filesink location=foo.png
``` ```
### Capture an image as jpeg ### Capture an image as JPEG
The `jpegenc` element can create a single JPEG:
``` ```
gst-launch-1.0 videotestsrc ! jpegenc ! filesink location=foo.jpg gst-launch-1.0 videotestsrc ! jpegenc ! filesink location=foo.jpg

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memory_transfer.md
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@ -4,6 +4,8 @@ The [`shmsink`](https://gstreamer.freedesktop.org/data/doc/gstreamer/head/gst-pl
### Putting a stream into memory ### Putting a stream into memory
Put a test video source into memory:
``` ```
gst-launch-1.0 -v videotestsrc ! \ gst-launch-1.0 -v videotestsrc ! \
'video/x-raw, format=(string)I420, width=(int)320, height=(int)240, framerate=(fraction)30/1' ! \ 'video/x-raw, format=(string)I420, width=(int)320, height=(int)240, framerate=(fraction)30/1' ! \
@ -26,10 +28,10 @@ gst-launch-1.0 filesrc location=$SRC ! \
### Reading a stream from memory ### Reading a stream from memory
This will display the video of a stream locally:
``` ```
gst-launch-1.0 shmsrc socket-path=/tmp/tmpsock ! \ gst-launch-1.0 shmsrc socket-path=/tmp/tmpsock ! \
'video/x-raw, format=(string)I420, width=(int)320, height=(int)240, framerate=(fraction)30/1' ! \ 'video/x-raw, format=(string)I420, width=(int)320, height=(int)240, framerate=(fraction)30/1' ! \
autovideosink autovideosink
```` ````

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mixing.md
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@ -97,7 +97,9 @@ gst-launch-1.0 \
Use the `audiomixer` element to mix audio. It replaces the `adder` element, which struggles under some circumstances (according to the [GStreamer 1.14 release notes](https://gstreamer.freedesktop.org/releases/1.14/)). Use the `audiomixer` element to mix audio. It replaces the `adder` element, which struggles under some circumstances (according to the [GStreamer 1.14 release notes](https://gstreamer.freedesktop.org/releases/1.14/)).
### Mix two (or more) test streams ### Mix two (or more) test audio streams
Here we use two different frequencies (tones):
``` ```
gst-launch-1.0 \ gst-launch-1.0 \
@ -112,6 +114,8 @@ gst-launch-1.0 \
### Mix two (or more) MP3 files ### Mix two (or more) MP3 files
Ensure `$AUDIO_SRC` and `$AUDIO_SRC2` environment variables are set to mp3 files.
``` ```
gst-launch-1.0 \ gst-launch-1.0 \
audiomixer name=mix ! audioconvert ! autoaudiosink \ audiomixer name=mix ! audioconvert ! autoaudiosink \

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test_streams.md
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@ -1,8 +1,10 @@
# Test streams (GStreamer command-line cheat sheet) # Test streams (GStreamer command-line cheat sheet)
## Video test streams ## Video test streams
### Display a test pattern ### Display a test pattern
The `videotestsrc` element creates test patterns. Display locally like this:
``` ```
gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink gst-launch-1.0 videotestsrc ! videoconvert ! autovideosink
@ -37,6 +39,8 @@ gst-launch-1.0 -v videotestsrc pattern=snow ! video/x-raw,width=1280,height=720
### Listen to a test audio (beep) ### Listen to a test audio (beep)
The element `audiotestsrc` can make a variety of test sounds:
``` ```
gst-launch-1.0 audiotestsrc ! autoaudiosink gst-launch-1.0 audiotestsrc ! autoaudiosink
``` ```
@ -58,6 +62,8 @@ gst-launch-1.0 audiotestsrc volume=0.1 ! autoaudiosink
### White noise ### White noise
Set `wave` to `white-noise`:
``` ```
gst-launch-1.0 audiotestsrc wave="white-noise" ! autoaudiosink gst-launch-1.0 audiotestsrc wave="white-noise" ! autoaudiosink
``` ```