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pikvm/docs/video.md
Moritz Poldrack bfdce5ef30
update documentation to reflect best-practices (#857) 
* update tailscale.md to reflect best-practices

The provided -Syy is supposed to be used to redownload all package databases,
while the command chain itself is a partial upgrade which is not recommended
either for rolling release distributions.

Replace the full database redownload with a database update and run a system
upgrade while installing tailscaled.

* remove unnecessary sync command from video.md

* remove unnecessary sync command from bluetooth_hid.md

* remove unnecessary sync command from arduino_hid.md

* update faq.md to reflect best practices

* update letsencrypt.md to keep system up-to-date when installing packages
2022-11-09 22:16:22 +03:00

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Working with video

Video recording

!!! info H.264 is available on Pi 3 and Pi 4. Older boards won't handle it. 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.

  1. Perform full system update to get the latest uStreamer and install ffmpeg:

    # rw
# pacman -Syu ffmpeg

  2. For USB dongle only: Add line gpu_mem=256 to /boot/config.txt.

  3. Perform reboot command.

  4. Run rw after the reboot.

  5. 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:

    # rw
# ustreamer-dump --sink kvmd::ustreamer::h264 --output - | ffmpeg -use_wallclock_as_timestamps 1 -i pipe: -c:v copy test.mp4

  6. Press Ctrl+C to stop recording. Your video will be in the file test.mp4.

  7. After finishing work, do not forget to switch the file system to read-only mode using ro command.

Take a screenshot via console on PiKVM

!!! note You must have a stream running

# curl --unix-socket /run/kvmd/ustreamer.sock http://localhost/snapshot -o /tmp/screen.jpg