Implement external commands for Windows

[Fruchtzwerg94]

Which version are you using?

v0.9.13

Describe the problem

Adding a custom command like
runOnPublish: ffmpeg -i rtsp://localhost:8554/$RTSP_SERVER_PATH -b:a 64k -f rtsp rtsp://localhost:8554/my/stream
to the configuration file does fail on windows:

ERR: exec: "/bin/sh": file does not exist

I think the reason is, /bin/sh should not be used on windows devices. The following two lines should be adapted to support different plattforms:

https://github.com/aler9/rtsp-simple-server/blob/79d0f2d053b4f5f6d1f1309652e49f061d580c95/path.go#L66
https://github.com/aler9/rtsp-simple-server/blob/1065fa010ba6832ef1a6674a0336de159eb139c5/client.go#L232

[aler9]

Hello, you're perfectly right, command should works on all platforms, i just did not have the time to do it.
Since the feature is simple to write, PRs are welcome.

[Fruchtzwerg94]

Done. See #80

[dmenig]

Hi. This happens on my Ubuntu machine. Whatever the command I put in runOnDemand, I have the same error. Whatever the version.

Do you know what might be causing my container not to have such executables ?

This is the result of my docker inspect

...
            "Cmd": null,

...

[Fruchtzwerg94]

Done.

[github-actions]

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