On YouTube: There are a number of different file formats including .mpeg and .avi that users may use when submitting their videos because these formats can easily be converted to Flash Video or .flv formats by YouTube after which anyone can view them online. Because of its greater compatibility, Flash Video is the one video format that has become very popular amongst the bigger hosting sites and thus is used most often.
Outside YouTube: As YouTube videos come with entire HTML code it is easier to embed code in different pages and with just a minor addition to such code, it becomes very easy to get your video to autoplay every time that page is visited or used. In fact, all it takes is to cut and paste these options which are why they are very popular amongst most social networking sites, though many users have reported less than satisfactory experiences when using embedded autoplay. It becomes much worse when using YouTube videos that usually slow down appreciably when loading, and which even may crash browsers.
General Concerns: There is nothing however to stop you from downloading videos from the YouTube web site to view the material offline using different video players though be careful that it you should not violate any copyright laws.
Download Quality: However, YouTube still has had problems after having gone the Flash GUI file format way and if you use Internet Explorer or even Firefox, your videos may not load. Information as to when this problem is going to be fixed is something still being awaited.
