DART-MX8M GSTREAMER: Difference between revisions
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== Major GStreamer commands == | == Major GStreamer commands == | ||
There are two major commands:<br> | There are two major commands:<br> | ||
gst-inspect - allows you to to get documentation on available elements and detailed information on a specific element. | gst-inspect - allows you to to get documentation on available elements and detailed information on a specific element.<br> | ||
<br | gst-launch - allows you to create and execute GStreamer pipelines. | ||
=== gst-inspect === | === gst-inspect === | ||
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= Camera Loopback = | = Camera Loopback = | ||
Stream video from a camera to a display</br> | Stream video from a camera to a display</br> | ||
$ gst-launch-1.0 v4l2src device=/dev/video0 ! kmssink | |||
= Video Recording = | = Video Recording = | ||
Save video stream from camera as an MJPEG-encoded AVI file | Save video stream from camera as an MJPEG-encoded AVI file | ||
$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi | |||
$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi | |||
= Video Playback = | = Video Playback = | ||
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= RTP Video streaming = | = RTP Video streaming = | ||
Encode video stream from camera using software jpeg encoder and stream it over RTP | Encode video stream from camera using a software jpeg encoder and stream it over RTP | ||
$ gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! jpegenc ! rtpjpegpay ! udpsink host=192.168.20.60 port=1223 | |||
gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! jpegenc ! rtpjpegpay ! udpsink host=192.168.20.60 port=1223 | |||
= References = | = References = | ||
* The GStreamer [https://gstreamer.freedesktop.org/ website] | * The GStreamer [https://gstreamer.freedesktop.org/ website] | ||
* NXP BSP Linux Users Guide, Multimedia section [https://www.nxp.com/webapp/Download?colCode=L4.9.51_8MQ_GA_LINUX_DOCS&Parent_nodeId=1513109797983730444282&Parent_pageType=product&Parent_nodeId=1513109797983730444282&Parent_pageType=product download link ] | * NXP BSP Linux Users Guide, Multimedia section [https://www.nxp.com/webapp/Download?colCode=L4.9.51_8MQ_GA_LINUX_DOCS&Parent_nodeId=1513109797983730444282&Parent_pageType=product&Parent_nodeId=1513109797983730444282&Parent_pageType=product download link ] |
Revision as of 15:25, 14 November 2018
Introduction to GStreamer
GStreamer is a powerful pipeline-based multimedia framework.
It allows programmers to create a variety of media-handling components, including simple audio playback, audio and video playback, recording, streaming and editing.
This is not a GStreamer reference manual but an overview for using it on the Variscite i.MX8 products.
This release uses the gstreamer-imx set of GStreamer 1.0 plugins for Freescale's i.MX platform, which make use of the i.MX multimedia capabilities.
Major GStreamer commands
There are two major commands:
gst-inspect - allows you to to get documentation on available elements and detailed information on a specific element.
gst-launch - allows you to create and execute GStreamer pipelines.
gst-inspect
Lists all available elements:
$ gst-inspect-1.0
Lists all available sink elements:
$ gst-inspect-1.0 | grep sink
For example:
root@imx8m-var-dart:~# gst-inspect-1.0 | grep sink alsa: alsasink: Audio sink (ALSA) waylandsink: waylandsink: wayland video sink shm: shmsink: Shared Memory Sink decklink: decklinkaudiosink: Decklink Audio Sink decklink: decklinkvideosink: Decklink Video Sink ximagesink: ximagesink: Video sink soup: souphttpclientsink: HTTP client sink autodetect: autovideosink: Auto video sink autodetect: autoaudiosink: Auto audio sink gdkpixbuf: gdkpixbufsink: GdkPixbuf sink playback: playsink: Player Sink video4linux2: v4l2sink: Video (video4linux2) Sink fbdevsink: fbdevsink: fbdev video sink tcp: tcpclientsink: TCP client sink tcp: tcpserversink: TCP server sink ...
Detailed help information on a specific element:
$ gst-inspect-1.0 vpudec
For example:
root@imx8m-var-dart:~# gst-inspect-1.0 vpudec Factory Details: Rank primary + 1 (257) Long-name VPU-based video decoder Klass Codec/Decoder/Video Description Decode compressed video to raw data Author Multimedia Team <shmmmw@freescale.com> Plugin Details: Name vpu.imx Description VPU video codec Filename /usr/lib/gstreamer-1.0/libgstvpu.so Version 4.3.4 License LGPL Source module imx-gst1.0-plugin Binary package Freescle Gstreamer Multimedia Plugins Origin URL http://www.freescale.com GObject +----GInitiallyUnowned +----GstObject +----GstElement +----GstVideoDecoder +----GstVpuDec Pad Templates: SINK template: 'sink' Availability: Always Capabilities: video/x-h265 video/x-vp9 video/x-vp8 video/x-vp6-flash video/x-h264 video/mpeg systemstream: false mpegversion: { (int)1, (int)2 } video/mpeg mpegversion: 4 video/x-h263 video/x-flash-video flvversion: 1 video/x-divx divxversion: 3 video/x-divx divxversion: 4 video/x-divx divxversion: { (int)5, (int)6 } video/x-xvid video/x-cavs video/x-wmv wmvversion: 3 format: WMV3 video/x-wmv wmvversion: 3 format: WVC1 video/x-pn-realvideo image/jpeg image/webp SRC template: 'src' Availability: Always Capabilities: video/x-raw format: { (string)NV12, (string)I420, (string)YV12, (string)Y42B, (string)NV16, (string)Y444, (string)NV24, (string)NV12_10LE } width: [ 1, 2147483647 ] height: [ 1, 2147483647 ] framerate: [ 0/1, 2147483647/1 ] Element Flags: no flags set Element Implementation: Has change_state() function: gst_video_decoder_change_state Element has no clocking capabilities. Element has no URI handling capabilities. Pads: SINK: 'sink' Pad Template: 'sink' SRC: 'src' Pad Template: 'src' Element Properties: name : The name of the object flags: readable, writable String. Default: "vpudec0" parent : The parent of the object flags: readable, writable Object of type "GstObject" output-format : set raw video format for output (Y42B NV16 Y444 NV24 only for MJPEG) flags: readable, writable Enum "GstVpuDecOutputFormat" Default: 0, "auto" (0): auto - enable chroma interleave. (default) (1): NV12 - NV12 format (2): I420 - I420 format (3): YV12 - YV12 format (4): Y42B - Y42B format (5): NV16 - NV16 format (6): Y444 - Y444 format (7): NV24 - NV24 format frame-drop : enable adaptive frame drop for smoothly playback flags: readable, writable Boolean. Default: true frame-plus : set number of addtional frames for smoothly playback flags: readable, writable Unsigned Integer. Range: 0 - 16 Default: 3 use-vpu-memory : use vpu allocate video frame buffer flags: readable, writable Boolean. Default: true
Test Pattern Stream
Test pattern allows you to display pre-built image/video patterns on the display. It is very useful when you don't have a camera but still want to test GStreamer.
Default test pattern:
$ gst-launch-1.0 videotestsrc ! kmssink
Test pattern with specific parameters on the input element
$ gst-launch-1.0 videotestsrc pattern=circular ! kmssink
Camera Loopback
Stream video from a camera to a display
$ gst-launch-1.0 v4l2src device=/dev/video0 ! kmssink
Video Recording
Save video stream from camera as an MJPEG-encoded AVI file
$ gst-launch-1.0 v4l2src device=/dev/video0 num-buffers=100 ! video/x-raw,width=1920,height=1080 ! jpegenc ! avimux ! filesink location=./test0.avi
Video Playback
Example of a video file playback using the playbin element (making use of the i.MX8M VPU decoder)
$ gst-launch-1.0 playbin uri=file:/run/media/sda1/big_buck_bunny.mp4
Example of a video file playback while explicitly specifying a pipeline (making use of the i.MX8M VPU decoder)
$ gst-launch-1.0 filesrc location=/run/media/sda1/big_buck_bunny.mp4 typefind=true ! video/quicktime ! aiurdemux ! queue max-size-time=0 ! vpudec ! kmssink
RTP Video streaming
Encode video stream from camera using a software jpeg encoder and stream it over RTP
$ gst-launch-1.0 v4l2src device=/dev/video0 ! video/x-raw,width=1280,height=720 ! jpegenc ! rtpjpegpay ! udpsink host=192.168.20.60 port=1223
References
- The GStreamer website
- NXP BSP Linux Users Guide, Multimedia section download link