Video Size for the Web
When a video is made for the web, sizing is very important. The major is issue is the dominant player for which the video will be played. If the video will be played on a player 320px x 240px, then this size is fine to make the video; whether the source is a video capture or edited movie. But, if the video target is youtube, a size like 640 x 480 or 640 x 360 may be preferred.
If the video will be embedded on a smaller a size on the website and viewable on youtube, the smaller size will expand and look larger on youtube without sacrifice to quality, while it will also look in proportion on the website. However, a video that is too large for the small website player that will bescaled down will cause a difficult navigational experience for the even though it looks proper for youtube.