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https://github.com/pikvm/pikvm
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35 lines
1.7 KiB
Markdown
35 lines
1.7 KiB
Markdown
# Video
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Currently, Pi-KVM uses MJPEG for video transmission. This is a simple and widely supported, but not very effective video format.
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In the near future, it is planned to support H264, and then switch to it as the main one.
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The H264 implementation is still under development, but right now you can use it to record video from your server.
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To do this, uStreamer supports simultaneous MJPEG and H264 encoding since version 3.0.
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### Video recording
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:exclamation: Best of all this feature only works for HDMI to CSI bridge. For the USB HDMI dongle, there will be a decrease in FPS to 10-15 for 1080p. Work in progress.
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* Perform full system update to get the latest uStreamer and install ffmpeg:
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```
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rw
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pacman -Syu
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pacman -S ffmpeg
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```
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* For USB dongle only: Add line `gpu_mem=256` to `/boot/config.txt`.
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* Perform `reboot` command.
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* Run `rw` after the reboot.
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* Add memory sink options to `/etc/kvmd/override.yaml`. This is necessary to get a dump of the video stream:
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```yaml
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kvmd:
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streamer:
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cmd_append:
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- "--h264-sink=kvmd::ustreamer::h264"
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```
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* Restart kvmd: `systemctl restart kvmd`. H264 encoding is almost CPU-free, so if you use RPi4 or RPi3, you can leave the option permanently.
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* To record a video, you need to enable the stream (open the web interface or connect via VNC). Then run something like this in the console:
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```
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rw
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ustreamer-dump --sink kvmd::ustreamer::h264 --output - | ffmpeg -use_wallclock_as_timestamps 1 -i pipe: -c:v copy test.mp4
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```
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* Press `Ctrl+C` to stop recording. You video will be in the file `test.mp4`.
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* After finishing work, do not forget to switch the file system to read-only mode using `ro` command.
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