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Alex X
42 lines
1.8 KiB
Markdown
42 lines
1.8 KiB
Markdown
# Video4Linux
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[`new in v1.9.9`](https://github.com/AlexxIT/go2rtc/releases/tag/v1.9.9)
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What you should to know about [V4L2](https://en.wikipedia.org/wiki/Video4Linux):
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- V4L2 (Video for Linux API version 2) works only in Linux
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- supports USB cameras and other similar devices
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- one device can only be connected to one software simultaneously
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- cameras support a fixed list of formats, resolutions and frame rates
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- basic cameras supports only RAW (non-compressed) pixel formats
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- regular cameras supports MJPEG format (series of JPEG frames)
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- advances cameras support H264 format (MSE/MP4, WebRTC compatible)
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- using MJPEG and H264 formats (if the camera supports them) won't cost you the CPU usage
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- transcoding RAW format to MJPEG or H264 - will cost you a significant CPU usage
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- H265 (HEVC) format is also supported (if the camera supports it)
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Tests show that the basic Keenetic router with MIPS processor can broadcast three MJPEG cameras in the following resolutions: 1600х1200 + 640х480 + 640х480. The USB bus bandwidth is no more enough for larger resolutions. CPU consumption is no more than 5%.
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Supported formats for your camera can be found here: **Go2rtc > WebUI > Add > V4L2**.
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## RAW format
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Example:
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```yaml
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streams:
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camera1: v4l2:device?video=/dev/video0&input_format=yuyv422&video_size=1280x720&framerate=10
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```
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Go2rtc supports built-in transcoding of RAW to MJPEG format. This does not need to be additionally configured.
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```
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ffplay http://localhost:1984/api/stream.mjpeg?src=camera1
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```
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**Important.** You don't have to transcode the RAW format to transmit it over the network. You can stream it in `y4m` format, which is perfectly supported by ffmpeg. It won't cost you a CPU usage. But will require high network bandwidth.
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```
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ffplay http://localhost:1984/api/stream.y4m?src=camera1
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```
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