Avformat: split the options from demux and mux in sections

modules/demux/avformat/avformat.c

@@ -42,6 +42,7 @@ vlc_module_begin ()
     set_shortname( N_("Avformat") )
     set_capability( "demux", 2 )
     set_callbacks( OpenDemux, CloseDemux )
+    set_section( N_("Demuxer"), NULL )
     add_string( "avformat-format", NULL, FORMAT_TEXT, FORMAT_LONGTEXT, true )
     add_obsolete_string("ffmpeg-format") /* removed since 2.1.0 */
 #if LIBAVFORMAT_VERSION_INT >= ((53<<16)+(26<<8)+0)
@@ -54,6 +55,7 @@ vlc_module_begin ()
     add_shortcut( "ffmpeg", "avformat" )
     set_description( N_("Avformat muxer" ) )
     set_capability( "sout mux", 2 )
+    set_section( N_("Muxer"), NULL )
     add_string( "sout-avformat-mux", NULL, MUX_TEXT, MUX_LONGTEXT, true )
     add_obsolete_string("ffmpeg-mux") /* removed since 2.1.0 */
     add_string( "sout-avformat-options", NULL, AV_OPTIONS_TEXT, AV_OPTIONS_LONGTEXT, true )