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80 lines
1.8 KiB
Markdown
80 lines
1.8 KiB
Markdown
---
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title: "GStreamer"
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date: 2020-02-08T20:46:36-05:00
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draft: false
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tags: [ "Audio-Video" ]
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medium_enabled: true
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---
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GStreamer is a pipeline based multimedia framework that goes from capture, processing, to a sink such as a X window or UDP sink.
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To install on Ubuntu run,
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```bash
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sudo apt install gstreamer1.0-tools
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```
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Pipelines are indicated via `!`.
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To capture your webcam feed and display it in a X window, run the following:
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```bash
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gst-launch-1.0 v4l2src device=/dev/video0 ! videoconvert ! ximagesink
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```
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For the PiCar project I'm on, I need to send the video from the raspberry pi over the network as fast as possible. The next couple commands have options that reflect this.
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On the PiCar, I send h264 video over the network. You might need to install an additional package for h264 encoding to work.
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```bash
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sudo apt install gstreamer1.0-plugins-ugly
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```
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To send h264 video over the network,
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```bash
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gst-launch-1.0 \
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v4l2src device=/dev/video0 ! \
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videoconvert ! \
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x264enc ! \
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rtph264pay ! \
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udpsink host=192.168.0.2 port=5000
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```
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To send it as fast as you can,
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```bash
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gst-launch-1.0 \
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v4l2src device=/dev/video0 ! \
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videoconvert ! \
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x264enc interlaced=true tune=zerolatency speed-preset=ultrafast ! \
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rtph264pay ! \
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udpsink host=192.168.0.2 port=5000
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```
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To send it as fast as possible under a given framerate (ex: 30)
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```bash
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gst-launch-1.0 \
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v4l2src device=/dev/video0 ! \
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videoconvert ! \
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videorate ! \
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video/x-raw,framerate=30/1 ! \
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x264enc interlaced=true tune=zerolatency speed-preset=ultrafast ! \
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rtph264pay ! \
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udpsink host=192.168.0.2 port=5000
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```
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To receive it and display it on an X-window,
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```bash
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gst-launch-1.0 \
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udpsrc port=5000 ! \
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application/x-rtp,payload=96 ! \
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rtph264depay ! \
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decodebin ! \
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videoconvert n-threads=4 ! \
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ximagesink
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```
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