WriteInt32( m->file, FOURCC( "strl" ) );
WriteStreamHeader( m->file, &mux_data->header );
WriteWaveFormatEx( m->file, &mux_data->format.a.f );
WriteInt32( m->file, FOURCC( "strl" ) );
WriteStreamHeader( m->file, &mux_data->header );
WriteWaveFormatEx( m->file, &mux_data->format.a.f );