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

source/patched-ffmpeg-mt/libavformat/output-example.c

 /*
  * Libavformat API example: Output a media file in any supported
  * libavformat format. The default codecs are used.
  *
  * Copyright (c) 2003 Fabrice Bellard
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to deal
  * in the Software without restriction, including without limitation the rights
  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
@@ skipping 50 matching lines @@
     if (!st) {
         fprintf(stderr, "Could not alloc stream\n");
         exit(1);
     }
 
     c = st->codec;
     c->codec_id = codec_id;
     c->codec_type = AVMEDIA_TYPE_AUDIO;
 
     /* put sample parameters */
+    c->sample_fmt = SAMPLE_FMT_S16;
     c->bit_rate = 64000;
     c->sample_rate = 44100;
     c->channels = 2;
 
     // some formats want stream headers to be separate
     if(oc->oformat->flags & AVFMT_GLOBALHEADER)
         c->flags |= CODEC_FLAG_GLOBAL_HEADER;
 
     return st;
 }
@@ skipping 464 matching lines @@
     if (!(fmt->flags & AVFMT_NOFILE)) {
         /* close the output file */
         url_fclose(oc->pb);
     }
 
     /* free the stream */
     av_free(oc);
 
     return 0;
 }