VAR-SOM-MX6 GSTREAM
Under construction!!!
Stream Camera with imxcamera application
On your host machine install Video Lan VLC VideoLan
- Find out your host IP address (Windows:ipconfig Linux:ifconfig)
- Start VLC, Media->Open Network Stream. Set the URL to "rtp://@:5004" and hit "Play".
- On target start imxcamera application.
- Hit the Settigns button. Select "Enable RTP" box and set the IP to you host machine. Hit OK.
- Push the Camera button to get a Video camera Image.
- Hit the blue button and the camera will be streamed to you host VLC.
Introduction to gstream
GStreamer
GStreamer is a powerful pipeline-based multimedia framework.
GStreamer allows a programmer 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 a overview for using in on Variscite i.MX6 products.
Major GStreamer commands
Two major commands, the first one allow you to to get documentation on available elements and detail information on a specific element. The second one allow you to create and execute GStreamer pipelines.
gst-inspect
List all available elements:
$ gst-inspect
List all avilable i.MX6 specific elements:
$ gst-inspect | grep imx
Detail help information on a specific element:
$ gst-inspect imxv4l2sink
gst-launch
Simple example:
gst-launch -v videotestsrc ! imxv4l2sink
i.MX6 major elements
| Prefix |
Element Name |
description |
|---|---|---|
| mp3enc.imx | mfw_mp3encoder | mp3 audio encoder |
| v4lsink.imx | imxv4l2sink | v4l2 video sink |
| isink.imx | mfw_isink | IPU-based video sink |
| v4lsrc.imx | imxv4l2src | v4l2 based camera src |
| vpu.imx | vpudec | VPU-based video decoder |
| vpu.imx | vpuenc | VPU-based video encoder |
| ipucsc.imx | mfw_ipucsc | IPU-based video converter |
Test Stream
Test pattern. Width will be set to output display width.
$ gst-launch -v videotestsrc ! imxv4l2sink
Test pattern with specific paramters on the input
$ gst-launch videotestsrc pattern=ball ! imxv4l2sink
Test pattern with specific paramters on the output
$ gst-launch videotestsrc ! imxv4l2sink disp-width=1280 disp-height=720
Test pattern with specific paramters on the input and output
$ gst-launch videotestsrc pattern=ball ! imxv4l2sink disp-width=1280 disp-height=720
Camera Stream
Test pattern.
$ gst-launch imxv4l2src device=/dev/video0 capture-mode=4 fps-n=30 queue-size=7 ! queue max-size-buffers=3 ! imxv4l2sink disp-width=1280 disp-height=720
- capture-mode ov5460 options:
- ov5640_mode_VGA_640_480 = 0,
- ov5640_mode_QVGA_320_240 = 1,
- ov5640_mode_NTSC_720_480 = 2,
- ov5640_mode_PAL_720_576 = 3,
- ov5640_mode_720P_1280_720 = 4,
- ov5640_mode_1080P_1920_1080 = 5
This is a 3 elements pipe.The queue in the middle is an GStreamer element.
Video Encode
720p:
$ gst-launch imxv4l2src capture-mode=4 fps-n=30 ! queue ! vpuenc codec=6 ! matroskamux ! filesink location=test.avi
1080p:
$ gst-launch imxv4l2src capture-mode=5 fps-n=30 ! queue ! vpuenc codec=6 ! matroskamux ! filesink location=test.avi
- The codec type for encoding
- flags: readable, writable
- Enum "vpuenc_codec" Default: 0, "mpeg4"
- (0): mpeg4 - video/mpeg,
- (5): h263 - video/x-h263
- (6): avc - video/x-h264
- (12): mjpg - image/jpeg
Stream RTP to VLC
On the imx6, we are a rtp client submitting h264 payloads to the VLC server (note the inclusion of the host/ip address of the PC) :
$ gst-launch-1.0 -v v4l2src ! 'image/jpeg,width=1280,height=720,framerate=10/1' ! rtph264pay ! udpsink host=192.168.1.111 port=5000