someone told me that when i upload swf file to Youtube will convert it flv automatically, but when i do this there is an error : Failed (unable to convert video file). so does anybody know how to convert swf to flv for sharing? thx in advance!

Just from Google I find this:

SWF to FLV Converter - convert SWF to FLV, SWF to MP3 files

Hard to tell if it is freeware but they mention a standard and pro version.

Here is the general Google with many pay for versions and perhaps some freeware:

convert swf to flv - Google Search

i've tried that, costs $99. but this one .SWF to .FLV Converter, Free download to convert .SWF to .FLV, SWF to Video. from the search result is much cheaper, thank you!

No problem.

Let us know if we can help further in the future.