I mainly record "screencasts" of MMO games.
Which of the various video formats that YouTube accepts will result in the smallest file size and what settings for that file type would I use?
Of course this is also constrained by a desire to have video quality that is not noticeably worse that the other options.
Best Answer
YouTube support a number of different options for uploading:
Really, for general-purpose video, everyone should be using h264.
The audio codec you choose is not going to make much a difference for a standard YouTube-length video, as long as it's lossy. I don't believe that YouTube accepts any lossless audio anyways, not to mention that it would be a ridiculous waste of disk space.
Realistically, if you want to produce really small encodes that don't take up much disk space, you'll have to spend many hours tweaking settings. I assume that your upload bandwidth is not capped enough to make this kind of effort worthwhile, but it would be nice to see what kind of change you're hoping for.
See also Google's help article on optimizing videos for upload.