- mlt_properties_set_int( properties, "frequency", (int) vi->rate );
- mlt_properties_set_int( properties, "channels", vi->channels );
+ mlt_properties_set_int( properties, "audio_frequency", (int) vi->rate );
+ mlt_properties_set_int( properties, "audio_channels", vi->channels );
+
+ // Set some media metadata
+ mlt_properties_set_int( properties, "meta.media.nb_streams", 1 );
+ mlt_properties_set_int( properties, "audio_index", 0 );
+ mlt_properties_set( properties, "meta.media.0.stream.type", "audio" );
+ mlt_properties_set( properties, "meta.media.0.codec.name", "vorbis" );
+ mlt_properties_set( properties, "meta.media.0.codec.long_name", "Vorbis" );