I tried my memcoder trick to concatenate/combine my flash videos, and it didn’t work this time for some reason. It gave this error message.
All video files must have identical fps, resolution, and codec for -ovc copy. Exiting...
So, I tried avidemux:
Again, you can open the first .flv file. Then, you use the Append option in the File menu to add the rest of the videos. These are the options that I found to save it:
