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Docs update (#24131)

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* fix incorrect backchannel docs

`#backchannel=0` is a native rtsp source param, not an ffmpeg one, and the troubleshooting warning had it listed as ffmpeg-only. Any `#` modifier on a bare `rtsp://` source turns the backchannel off unless the URL explicitly contains `#backchannel=1`, so a dedicated two-way talk stream can't carry `#video=h264` or anything else.

* add rotation faq
This commit is contained in:
Josh Hawkins
2026-08-29 07:01:11 -06:00
committed by GitHub
parent a745070b76
commit d37dff1b49
3 changed files with 21 additions and 3 deletions
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docs/docs/troubleshooting/faqs.md
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@@ -39,6 +39,20 @@ To do this efficiently the following setup is required:
When this is done correctly, the GPU will do the decoding and scaling which will result in a small increase in CPU usage but with better results.
### How can I rotate my camera's video feed?
Rotation is best done in the camera's firmware settings (usually called rotate, flip, or corridor mode) so the video arrives already rotated and no extra processing is needed. Check there first.
If your camera does not support rotation, go2rtc's ffmpeg module can rotate the stream with the `#rotate` parameter (`90`, `180`, `270`, or `-90`), but this is not recommended: rotation requires transcoding (re-encoding) the video, which significantly increases CPU usage, especially for high resolution streams.
```yaml
go2rtc:
streams:
my_camera: "ffmpeg:rtsp://user:password@192.168.1.10:554/stream#video=h264#hardware#rotate=90"
```
Point the camera's inputs at the restream as described in the [restream docs](/configuration/restream.md), and swap `detect -> width` and `detect -> height` to match the rotated resolution.
### My mjpeg stream or snapshots look green and crazy
This almost always means that the width/height defined for your camera are not correct. Double check the resolution with VLC or another player. Also make sure you don't have the width and height values backwards.