avconv_opt: allocate an OutputFile before the streams.

This way OutputFile variables like recording time can be used when
creating the streams.

avconv_opt.c

@@ -820,7 +820,7 @@ static OutputStream *new_output_stream(OptionsContext *o, AVFormatContext *oc, e
         exit(1);
     output_streams[nb_output_streams - 1] = ost;
 
-    ost->file_index = nb_output_files;
+    ost->file_index = nb_output_files - 1;
     ost->index      = idx;
     ost->st         = st;
     st->codec->codec_type = type;
@@ -1294,6 +1294,19 @@ static int open_output_file(OptionsContext *o, const char *filename)
         exit(1);
     }
 
+    GROW_ARRAY(output_files, nb_output_files);
+    of = av_mallocz(sizeof(*of));
+    if (!of)
+        exit(1);
+    output_files[nb_output_files - 1] = of;
+
+    of->ost_index      = nb_output_streams;
+    of->recording_time = o->recording_time;
+    of->start_time     = o->start_time;
+    of->limit_filesize = o->limit_filesize;
+    of->shortest       = o->shortest;
+    av_dict_copy(&of->opts, o->g->format_opts, 0);
+
     if (!strcmp(filename, "-"))
         filename = "pipe:";
 
@@ -1302,6 +1315,9 @@ static int open_output_file(OptionsContext *o, const char *filename)
         print_error(filename, AVERROR(ENOMEM));
         exit(1);
     }
+    of->ctx = oc;
+    if (o->recording_time != INT64_MAX)
+        oc->duration = o->recording_time;
 
     if (o->format) {
         file_oformat = av_guess_format(o->format, NULL, NULL);
@@ -1477,23 +1493,6 @@ loop_end:
         avio_close(pb);
     }
 
-    GROW_ARRAY(output_files, nb_output_files);
-    of = av_mallocz(sizeof(*of));
-    if (!of)
-        exit(1);
-    output_files[nb_output_files - 1] = of;
-
-    of->ctx            = oc;
-    of->ost_index      = nb_output_streams - oc->nb_streams;
-    of->recording_time = o->recording_time;
-    if (o->recording_time != INT64_MAX)
-        oc->duration = o->recording_time;
-    of->start_time     = o->start_time;
-    of->limit_filesize = o->limit_filesize;
-    of->shortest       = o->shortest;
-    av_dict_copy(&of->opts, o->g->format_opts, 0);
-
-
     /* check if all codec options have been used */
     unused_opts = strip_specifiers(o->g->codec_opts);
     for (i = of->ost_index; i < nb_output_streams; i++) {