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clarify shm in docs

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Blake Blackshear 2021-11-08 07:29:20 -06:00
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docs/docs/installation.md
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@ -84,7 +84,7 @@ Frigate utilizes shared memory to store frames during processing. The default `s
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 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.
You can calculate the necessary shm-size for each camera with the following formula: 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 = <shm size in mb>