Bug#798189: rtmp inside m3u don't supported anymore

[Carl Eugen Hoyos]

Hi!

I believe this is FFmpeg ticket #4797, thank you for the sample CNN.m3u that I 
attached there!
https://trac.ffmpeg.org/ticket/4797
The samples WTV-9.m3u and twIT.m3u work fine here, I cannot reproduce an issue 
for them.

Carl Eugen