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Update restream.md docs and clarify output config (#22860)

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* Update restream.md

Clarified that exec output must be put in curly braces ONLY in case of RTSP, not pipe, as per go2rtc docs. Added additional example use case for exec function (rpi5b cam set-up).

* Cleanup

Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>
Co-authored-by: Josh Hawkins <32435876+hawkeye217@users.noreply.github.com>
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docs/docs/configuration/restream.md
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@ -208,7 +208,7 @@ Enabling arbitrary exec sources allows execution of arbitrary commands through g
## Advanced Restream Configurations ## Advanced Restream Configurations
The [exec](https://github.com/AlexxIT/go2rtc/tree/v1.9.10#source-exec) source in go2rtc can be used for custom ffmpeg commands. An example is below: The [exec](https://github.com/AlexxIT/go2rtc/tree/v1.9.10#source-exec) source in go2rtc can be used for custom ffmpeg commands and other applications. An example is below:
:::warning :::warning
@ -216,16 +216,11 @@ The `exec:`, `echo:`, and `expr:` sources are disabled by default for security.
::: :::
:::warning NOTE: RTSP output will need to be passed with two curly braces `{{output}}`, whereas pipe output must be passed without curly braces.
The `exec:`, `echo:`, and `expr:` sources are disabled by default for security. You must set `GO2RTC_ALLOW_ARBITRARY_EXEC=true` to use them. See [Security: Restricted Stream Sources](#security-restricted-stream-sources) for more information.
:::
NOTE: The output will need to be passed with two curly braces `{{output}}`
```yaml ```yaml
go2rtc: go2rtc:
streams: streams:
stream1: exec:ffmpeg -hide_banner -re -stream_loop -1 -i /media/BigBuckBunny.mp4 -c copy -rtsp_transport tcp -f rtsp {{output}} stream1: exec:ffmpeg -hide_banner -re -stream_loop -1 -i /media/BigBuckBunny.mp4 -c copy -rtsp_transport tcp -f rtsp {{output}}
stream2: exec:rpicam-vid -t 0 --libav-format h264 -o -
``` ```