ffmpeg update to june 23 version which fixes mp4 crash on still frames with 3...

source/patched-ffmpeg-mt/libavformat/rtpenc.c

Index: source/patched-ffmpeg-mt/libavformat/rtpenc.c
===================================================================
--- source/patched-ffmpeg-mt/libavformat/rtpenc.c	(revision 50820)
+++ source/patched-ffmpeg-mt/libavformat/rtpenc.c	(working copy)
@@ -131,6 +131,12 @@
         s->max_payload_size = n * TS_PACKET_SIZE;
         s->buf_ptr = s->buf;
         break;
+    case CODEC_ID_H264:
+        /* check for H.264 MP4 syntax */
+        if (st->codec->extradata_size > 4 && st->codec->extradata[0] == 1) {
+            s->nal_length_size = (st->codec->extradata[4] & 0x03) + 1;
+        }
+        break;
     case CODEC_ID_AMR_NB:
     case CODEC_ID_AMR_WB:
         if (!s->max_frames_per_packet)