When choosing the file format, platform compatibility is important. For example, releases using the Xvid encoder must use the two-pass encoding method, which takes twice as long as a single pass, but achieves much higher quality similarly, DVD-R releases that must be re-encoded often use 6 or 8 passes to get the best quality. In general, quality is not sacrificed for speed, and the standards will usually opt for the highest quality possible, even if this takes much longer. New codecs are usually tested annually to check if any offer any conclusive enhancement in quality or compression time. Newer video standards moved away from the size constraints and replaced them with a quality based alternative such as the use of CRF. If more discs are required for sufficient quality, the standard will define the circumstances where it is acceptable to expand to a second or third disc.
The standards are designed such that a certain amount of content will fit on each piece of media, with the best possible quality in terms of size. When choosing file size, the limiting factor is the size of the media to be used (such as 700MB for CD-R). Creators of the standard usually do comprehensive testing to find optimal codecs and settings for sound and video to maximize image quality in the selected file size. The first part of a standards document usually defines the format properties for the material, like codec, bitrate, resolution, file type and file size. There are rules of naming and organizing files, rules that dictate how a file must be packaged and an nfo file, that contains required information, must be added with the content. 3.3.2 DivX and Xvid for television sources.3.3.1 DivX and Xvid for retail and bootleg sources.
0 kommentar(er)
