Fix rtsp static rtsp sink

[joaoantoniocardoso]

Fixes #210 by connecting sinks before starting the pipeline.

Don't merge it yet as I'm still testing all cases.

Tests:

• RTSP h264 1080p 30fps + with multiple WebRTC clients
• UDP h264 1080p 30fps + with multiple WebRTC clients
• stress streams creation
• stress thumbnails
• RTSP with other encodings, sizes and fpss
• UDP with other encodings, sizes and fpss

[joaoantoniocardoso]

just to point out that while solutions using the oneshot channel or barrier would have solved it, the broadcast channel is the easiest to deal with without fighting with async.

[patrickelectric]

@joaoantoniocardoso please create the release and prepare it to BlueOS, I would like to create a new version with it ASAP.

[aihamshikhomicro]

Hello,
I don't know if this is the right place to ask my question but it's not an actual issue so I'll ask it here.
How do I create a redirect stream from a rtsp IP camera stream?
I created a gstreamer pipline to receive it and it's working fine, but how do I create a MAVLINK stream from it? the device in the UI for redirect source is a fixed text, where do I specify my rtsp link an create a redirect out of it?

[joaoantoniocardoso]

Hi @aihamshikhomicro, I moved it to a new issue, I'll respond to you there: #269