FilterPackets on TCP Stream always filters conversation with ID=0

["tech.account () libero it" <tech.account () libero it>]

I have to filter single TCP streams 
out of the open capture file. Therefore I am programmatically applying 
display-filter "tcp.stream eq TCP_STREAM_ID".
The problem I have is that no matter the value of TCP_STREAM_ID, the stream whose id is 0 gets selected.

Please find a snapshot of my code below.
gchar *data_out_filename;
QString follow_filter;
int tmp_fd;

follow_filter=QString("tcp.stream eq 5"); // TCP_STREAM_ID==5

reset_tcp_reassembly();
tmp_fd = create_tempfile(&data_out_filename, "follow");
data_out_file = fdopen(tmp_fd, "w+b");

emit updateFilter(follow_filter, TRUE);


What am I doing wrong? Am I missing anything?

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