As long as you use a good codec (no problem if you use FRAPS) and follow guidelines, you will be okay. Quality is kinda important.
Guideline in a nutshell:
-less than...width less than 480(?), use pointresize (use this on handheld games and older systems like NES and SNES)
-upload a text file.
To make some of our lives (well, mines at least) easier:
For size: assuming you are using Windows: Right-click -> Properties. Use "Size". Not "size on Disk" or the size seen when you hover over a file. Copy the kazillion numbers. If it is something like 2,438,694,385 bytes, copy it all (I prefer putting in with commas and without commas. No commas = faster fill in my opinion). It makes filling out the download page faster and allow us (well, me and JonL...I think. :3) to know if a file is done uploading on FTP. For Time, put it in hh:mm:ss format, not 1 hour 23 minutes. Again, it speeds up the filling (I copy from a text file.)
Requirement thread
Don't worry, it really isn't that strict. :3
Pro tip for FTP:
assuming you are using FileZilla:
Transfer -> Default File Exists action
Change Upload's option to "Resume file transfer". Continue to upload when connection stops all of a sudden so you won't have to keep uploading the same file a kazillion times.