Merge commit '73084391'

* commit '73084391':
  lavf: Don't explicitly flush after each written packet in muxers

Conflicts:
	libavformat/assenc.c
	libavformat/yuv4mpeg.c

See: 8de9bb6eMerged-by: Michael Niedermayer <michaelni@gmx.at>

libavformat/assenc.c

@@ -87,6 +87,7 @@ static int write_packet(AVFormatContext *s, AVPacket *pkt)
     } else {
         avio_write(s->pb, pkt->data, pkt->size);
     }
+
     return 0;
 }