mirror of https://github.com/pikvm/pikvm
You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
35 lines
1.7 KiB
Markdown
35 lines
1.7 KiB
Markdown
# Video
|
|
Currently, Pi-KVM uses MJPEG for video transmission. This is a simple and widely supported, but not very effective video format.
|
|
In the near future, it is planned to support H264, and then switch to it as the main one.
|
|
|
|
The H264 implementation is still under development, but right now you can use it to record video from your server.
|
|
To do this, uStreamer supports simultaneous MJPEG and H264 encoding since version 3.0.
|
|
|
|
### Video recording
|
|
: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.
|
|
|
|
* Perform full system update to get the latest uStreamer and install ffmpeg:
|
|
```
|
|
rw
|
|
pacman -Syu
|
|
pacman -S ffmpeg
|
|
```
|
|
* For USB dongle only: Add line `gpu_mem=256` to `/boot/config.txt`.
|
|
* Perform `reboot` command.
|
|
* Run `rw` after the reboot.
|
|
* Add memory sink options to `/etc/kvmd/override.yaml`. This is necessary to get a dump of the video stream:
|
|
```yaml
|
|
kvmd:
|
|
streamer:
|
|
cmd_append:
|
|
- "--h264-sink=kvmd::ustreamer::h264"
|
|
```
|
|
* Restart kvmd: `systemctl restart kvmd`. H264 encoding is almost CPU-free, so if you use RPi4 or RPi3, you can leave the option permanently.
|
|
* 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
|
|
```
|
|
* Press `Ctrl+C` to stop recording. You video will be in the file `test.mp4`.
|
|
* After finishing work, do not forget to switch the file system to read-only mode using `ro` command.
|