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

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

 /*
  * RTP output format
  * Copyright (c) 2002 Fabrice Bellard
  *
  * This file is part of FFmpeg.
  *
  * FFmpeg is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Lesser General Public
  * License as published by the Free Software Foundation; either
  * version 2.1 of the License, or (at your option) any later version.
@@ skipping 113 matching lines @@
     case CODEC_ID_MPEG1VIDEO:
     case CODEC_ID_MPEG2VIDEO:
         break;
     case CODEC_ID_MPEG2TS:
         n = s->max_payload_size / TS_PACKET_SIZE;
         if (n < 1)
             n = 1;
         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)
             s->max_frames_per_packet = 12;
         if (st->codec->codec_id == CODEC_ID_AMR_NB)
             n = 31;
         else
             n = 61;
         /* max_header_toc_size + the largest AMR payload must fit */
         if (1 + s->max_frames_per_packet + n > s->max_payload_size) {
@@ skipping 267 matching lines @@
     NULL_IF_CONFIG_SMALL("RTP output format"),
     NULL,
     NULL,
     sizeof(RTPMuxContext),
     CODEC_ID_PCM_MULAW,
     CODEC_ID_NONE,
     rtp_write_header,
     rtp_write_packet,
     rtp_write_trailer,
 };