Failed to play out SRT stream from Docker containers

[Wkkkkk]

When testing with a sample SRT stream from Docker, we noticed that it might fail to play out in some cases on Ubuntu:

1. Generate SRT stream with Docker docker run --rm --name=testsrc -p 1234:1234/udp eyevinntechnology/testsrc

2. Play it out using different tools

   • [x] with srt_whep from Docker too
   • [x] with GStreamer Playbin
   • [x] with srt_whep

3. We see that it failed to play out when use srt_whep directly.

[Wkkkkk]

This has been fixed in last commit.