After the flash version 10 as I can remember, the old method of going to the temp folder /tmp/ and copying the video from there is not working, you will not find it there, It is put there then deleted from disk and treated as a file in memory so this is how to get it.

Using the terminal:

 pgrep -f flashplayer 

this will display the process IDs using flash player, assume the process ID was 3660, then navigate to the process data

 cd /proc/3660/fd 

and list the files there

 ls -l 

you might find a file written at the end of its line ” /tmp/FlashXX3HWsv1 (deleted)”

Screenshot from 2013-06-29 08:54:29

this is the video, copy it to wherever you want but use that number as the file name

 cp 30 /wherever/vid.flv