rtmpproto.c: Fixed RTMP Stream output issue

Original code had the assumption of only one FLV packet per RTMP packet. But that assumption is incorrect for higher bit rates. Made changes to the code to accommodate more than one FLV packet per RTMP
+packet.

libavformat/rtmpproto.c

@@ -925,7 +925,7 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
     uint32_t ts;
     const uint8_t *buf_temp = buf;
 
-    if (size < 11) {
+    if (!rt->flv_off && size < 11) {
         av_log(s, AV_LOG_DEBUG, "FLV packet too small %d\n", size);
         return 0;
     }
@@ -966,20 +966,22 @@ static int rtmp_write(URLContext *s, const uint8_t *buf, int size)
         if (rt->flv_size - rt->flv_off > size_temp) {
             bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, size_temp);
             rt->flv_off += size_temp;
+            size_temp = 0;
         } else {
             bytestream_get_buffer(&buf_temp, rt->flv_data + rt->flv_off, rt->flv_size - rt->flv_off);
             rt->flv_off += rt->flv_size - rt->flv_off;
+            size_temp -= (rt->flv_size - rt->flv_off);
         }
 
         if (rt->flv_off == rt->flv_size) {
             bytestream_get_be32(&buf_temp);
-
+            size_temp -= 4;
             ff_rtmp_packet_write(rt->stream, &rt->out_pkt, rt->chunk_size, rt->prev_pkt[1]);
             ff_rtmp_packet_destroy(&rt->out_pkt);
             rt->flv_size = 0;
             rt->flv_off = 0;
         }
-    } while (buf_temp - buf < size_temp);
+    } while (buf_temp - buf < size);
     return size;
 }