Merge commit '857e6667'

* commit '857e6667':
  rtmpproto: Clarify a comment

Conflicts:
	libavformat/rtmpproto.c
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtmpproto.c

@@ -3021,6 +3021,9 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
                                                      &rt->nb_prev_pkt[1],
                                                      channel)) < 0)
                     return ret;
+                // Force sending a full 12 bytes header by cleaing the
+                // channel id, to make it not match a potential earlier
+                // packet in the same channel.
                 rt->prev_pkt[1][channel].channel_id = 0;
             }