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Fix shm size calculation

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Felipe Santos 2023-01-16 21:56:29 -03:00 committed by GitHub
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docs/docs/frigate/installation.md
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@ -74,14 +74,14 @@ database:
### Calculating required shm-size
Frigate utilizes shared memory to store frames during processing. The default `shm-size` provided by Docker is 64m.
Frigate utilizes shared memory to store frames during processing. The default `shm-size` provided by Docker is **64MB**.
The default shm-size of 64m is fine for setups with 2 or less 1080p cameras. If Frigate is exiting with "Bus error" messages, it is likely because you have too many high resolution cameras and you need to specify a higher shm size.
The default shm-size of **64MB** is fine for setups with 2 or less 1080p cameras. If Frigate is exiting with "Bus error" messages, it is likely because you have too many high resolution cameras and you need to specify a higher shm size.
You can calculate the necessary shm-size for each camera with the following formula using the resolution specified for detect:
```
(width * height * 1.5 * 9 + 270480)/1048576 = <shm size in mb>
(width * height * 1.5 * 9 + 270480)/1048576 + 30 = <shm size in MB>
```
The shm size cannot be set per container for Home Assistant Addons. You must set `default-shm-size` in `/etc/docker/daemon.json` to increase the default shm size. This will increase the shm size for all of your docker containers. This may or may not cause issues with your setup. https://docs.docker.com/engine/reference/commandline/dockerd/#daemon-configuration-file