Author Archives: Error-Prone

Low Latency HomeKit Camera Support: Homebridge FFmpeg Plugin with Custom Codec Configuration

Stream passthrough method for low latency HomeKit camera support:

  • Device: EZVIZ (萤石) CS-C6CN-3H2CWF (星光夜视版)
  • Low latency (as low as 100ms) from the camera to homebridge-camera-ffmpeg
  • Low CPU load since all streams are passthrough from FFmpeg without re-encoding
  • No audio support due to compatibility issue from the source stream

The configuration should be look like:

"videoConfig": {
    "source": "-rtsp_transport tcp -i rtsp://admin:<device_passcode>@<device_ip>:554/h265/ch1/main/av_stream",
    "maxFPS": 30,
    "audio": false,
    "vcodec": "copy",

Here’s the tricky part: the EZVIZ CS-C6CN-3H2CWF will output h265 by default, which is not supported by HAP. And the default bitrate is also too high to handle for iOS devices. So you will need to update some settings for the camera:

  • Download the Chinese version of EZVIZ Studio from the official website (direct link).
  • Install and run
  • Click 本地设备 (Local Devices) on the sidebar
  • Right-click the camera you want to modify, then choose 高级设置 (Advanced Settings)
  • In the popup window, click 图像 (Images) – 视音频 (Audio/Video) on the sidebar, change the following settings:
    • 编码类型 (Encoding Type): STD_H264
    • 码率上限 (Bitrate Limit): 1024 Kbps
    • (Optional) 分辨率 (Resolution): HD720P
  • Click 保存 (Save) to save the settings

Please note this step will slightly reduce the quality of your video stream when you view the stream in EZVIZ official app, but it’s mandatory for the camera to work with HomeKit.

Bonus: audio support without compiling FFmpeg after version 1.0.0:

"videoConfig": {
    "source": "-rtsp_transport tcp -i rtsp://admin:<device_passcode>@<device_ip>:554/h265/ch1/main/av_stream",
    "maxFPS": 30,
    "audio": true

This will make FFmpeg re-encode your stream and hurt your CPU. The latency is about 0.6-1 second. I suggest you install Homebridge on a Mac mini for better performance.

balenaEtcher: Source and destination checksums do not match errors

If you got the following errors:

\\.\PhysicalDrive1: Source and destination checksums do not match: <hash1> !== <hash2>

You can try to disable removable drives to be added to libraries setting for System Volume Information folder creation:

How to prevent creation of “System Volume Information” folder in Windows 10 for USB flash drives?

Install Zerotier One on UniFi Cloud Key

Run the following commands on your UniFi Cloud Key:

curl -s | bash


*** ZeroTier One Quick Install for Unix-like Systems

*** Tested distributions and architectures:
***   MacOS (10.7+) on x86_64 (just installs ZeroTier One.pkg)
***   Debian (7+) on x86_64, x86, arm, and arm64
***   RedHat/CentOS (6+) on x86_64 and x86
***   Fedora (16+) on x86_64 and x86
***   SuSE (12+) on x86_64 and x86
***   Mint (18+) on x86_64, x86, arm, and arm64

*** Please report problems to [email protected] and we will try to fix.

*** Detecting Linux Distribution

*** Found Debian "jessie" (or similar), creating /etc/apt/sources.list.d/zerotier.list

*** Installing zerotier-one package...
Hit jessie InRelease                                                                                                  
Hit jessie/main armhf Packages                                                                                                                                              
Get:1 jessie InRelease [20.9 kB]                                              
Ign jessie InRelease                                                                                
Get:2 jessie/updates InRelease [44.9 kB]                                                   
Hit cloudkey-stable InRelease                                           
Hit cloudkey-stable/ubiquiti armhf Packages                                                     
Hit jessie Release.gpg                                   
Get:3 jessie/main armhf Packages [2479 B]
Hit jessie Release                                          
Hit jessie/main armhf Packages                                                                                                                                             
Hit jessie/contrib armhf Packages                                                                                                                                          
Hit jessie/non-free armhf Packages                                                                                                                                         
Get:4 jessie/updates/main armhf Packages [695 kB]                                                                                                                           
Hit jessie/updates/contrib armhf Packages                                                                                                                                   
Hit jessie/updates/non-free armhf Packages                                                                                                                                  
Fetched 764 kB in 1s (764 KB/s)                                                                                                                                                                  
Reading package lists... Done
Reading package lists... Done
Building dependency tree       
Reading state information... Done
The following NEW packages will be installed:
0 upgraded, 1 newly installed, 0 to remove and 2 not upgraded.
Need to get 763 kB of archives.
After this operation, 2366 kB of additional disk space will be used.
Get:1 jessie/main zerotier-one armhf 1.4.6 [763 kB]
Fetched 763 kB in 44s (17.3 kB/s)                                                                                                                                                                      
Selecting previously unselected package zerotier-one.
(Reading database ... 23329 files and directories currently installed.)
Preparing to unpack .../zerotier-one_1.4.6_armhf.deb ...
Unpacking zerotier-one (1.4.6) ...
Processing triggers for systemd (230-7~bpo8+2.ubnt+1) ...
Setting up zerotier-one (1.4.6) ...
Processing triggers for systemd (230-7~bpo8+2.ubnt+1) ...

*** Enabling and starting zerotier-one service...
Synchronizing state of zerotier-one.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable zerotier-one

*** Waiting for identity generation...

*** Success! You are ZeroTier address [ e50a7c7fc2 ].

Run zerotier-cli to see if everything works:

ZeroTier One version 1.4.6 build 0 (platform 1 arch 3)
Copyright (c) 2019 ZeroTier, Inc.
Licensed under the ZeroTier BSL 1.1 (see LICENSE.txt)
Usage: zerotier-cli [-switches] <command/path> [<args>]

Please note after upgrading the Cloud Key firmware, you need to reinstall the Zerotier One package. And if you got the following error when trying to reinstall the package:

*** Enabling and starting zerotier-one service...
Synchronizing state of zerotier-one.service with SysV service script with /lib/systemd/systemd-sysv-install.
Executing: /lib/systemd/systemd-sysv-install enable zerotier-one

*** Waiting for identity generation...

Press control – C and execute the following to restart the service and rejoin the Zerotier network:

systemctl restart zerotier-one
systemctl status zerotier-one
zerotier-cli info
200 info 8ade3af9ef 1.4.6 ONLINE
zerotier-cli join eda9f5dbfe94adbe
200 join OK
# ...then approve it in your Zerotier dashboard
# list network
zerotier-cli listnetworks -j