Merge commit '274e134e49b1c92db0f0b8cb2ae7554fb7b9184c'

* commit '274e134e49b1c92db0f0b8cb2ae7554fb7b9184c':
  avconv: check that the output format context exists before accessing it

Conflicts:
	ffmpeg.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>

ffmpeg.c

@@ -454,7 +454,7 @@ static void exit_program(void)
     /* close files */
     for (i = 0; i < nb_output_files; i++) {
         AVFormatContext *s = output_files[i]->ctx;
-        if (s && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
+        if (s && s->oformat && !(s->oformat->flags & AVFMT_NOFILE) && s->pb)
             avio_close(s->pb);
         avformat_free_context(s);
         av_dict_free(&output_files[i]->opts);