avconv: use new options parser.

avconv.h

@@ -67,6 +67,8 @@ typedef struct MetadataMap {
 } MetadataMap;
 
 typedef struct OptionsContext {
+    OptionGroup *g;
+
     /* input/output options */
     int64_t start_time;
     const char *format;
@@ -361,4 +363,6 @@ int configure_output_filter(FilterGraph *fg, OutputFilter *ofilter, AVFilterInOu
 int ist_in_filtergraph(FilterGraph *fg, InputStream *ist);
 FilterGraph *init_simple_filtergraph(InputStream *ist, OutputStream *ost);
 
+int avconv_parse_options(int argc, char **argv);
+
 #endif /* AVCONV_H */