Export to SWF (flash) format

Hello and thanks again,
Following my previous question, tried to export some swf files, most of them played well.
Just for curiousity, opened one log file (of a good swf file) and managed to copy this:

Timestamps are unset in a packet for stream 1. This is deprecated and will stop working in the future. Fix your code to set the timestamps properly
(what and where to fix, or, if good, leave it as is?)
Encoder did not produce proper pts, making some up.
Statistics: 8302430 bytes written, 64 seeks, 94 writeouts
Completed successfully in 00:00:03

Can I please have some explanations about the above ?
Note: System’s date and time OK.
Answers will be appreciated.
Thanks
Motim