Merge commit 'b97b1adb'

* commit 'b97b1adb':
  rtmpproto: Add a comment explaining the logic in handle_notify
Merged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/rtmpproto.c

@@ -2092,9 +2092,11 @@ static int handle_notify(URLContext *s, RTMPPacket *pkt) {
 
     // generate packet header and put data into buffer for FLV demuxer
     if (rt->flv_off < rt->flv_size) {
+        // There is old unread data in the buffer, thus append at the end
         old_flv_size  = rt->flv_size;
         rt->flv_size += datatowritelength + 15;
     } else {
+        // All data has been read, write the new data at the start of the buffer
         old_flv_size = 0;
         rt->flv_size = datatowritelength + 15;
         rt->flv_off  = 0;