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Add note about some cameras needing to seek to get a valid snapshot (#27542)

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* Add note about some cameras needing to seek to get a valid snapshot

* Update source/_integrations/onvif.markdown

* Apply suggestions from code review
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J. Nick Koston 2023-05-27 00:30:30 -05:00 committed by GitHub
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source/_integrations/onvif.markdown
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@ -46,6 +46,15 @@ You can configure specific FFmpeg options through the integration options flow b
| Extra FFmpeg arguments | Extra options to pass to `ffmpeg`, e.g., image quality or video filter options. More details in [`ffmpeg` integration](/integrations/ffmpeg). |
| Use wallclock as timestamps | ([Advanced Mode](/blog/2019/07/17/release-96/#advanced-mode) only) Rewrite the camera timestamps. This may help with playback or crashing issues from Wi-Fi cameras or cameras of certain brands (e.g., EZVIZ). |
#### Snapshots
Some cameras will not produce usable snapshots with larger stream sizes.
By default, the integration will only enable the camera entity for the first H264 profile. If you are unable to get a working snapshot:
- If additional camera entities are available for other profiles, try enabling those entities.
- Set the `Extra FFmpeg arguments` to `-pred 1 -ss 00:00:05 -frames:v 1` to cause the snapshot to be taken 5 seconds into the stream.
### Supported Sensors
This integration uses the ONVIF pullpoint subscription API to process events into sensors that will be automatically added to Home Assistant. Below is a list of currently supported event topics along with the entities they create.