[rtmpdump] Pull request: -objEnc opt flag for rtmpdump

[Foy Savas]

I was recently dumping some videos for a client and found a major CDN
disconnecting on me after streaming just a small bit of content.

After extensively diff-ing the packet exchanges from rtmpdump with
that of a working SWF through rtmpsuck, the only major difference was
the SWF specifying AMF3 objectEncoding on connect. As odd as that may
sound, when I forced rtmpdump to connect specifying AMF3, I no longer
received any peer disconnects.

Just in case others run into this same problem, here's a link to a
commit modifying rtmpdump to more readily set objectEncoding via opt
flag:

https://github.com/foysavas/rtmpdump/commit/2c2ae7b79251c72303c4f4b1d94c8a25e7997707

Best,
Foy