CSS encryption : This is the encryption method used in DVDs. This encryption does allow files to be copied off the DVD, but the resulting files will contain garbage data that will be useless. Not all files on the DVD are encrypted...
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CSS encryption : This is the encryption method used in DVDs. This encryption does allow files to be copied off the DVD, but the resulting files will contain garbage data that will be useless. Not all files on the DVD are encrypted though, and different files may use a different decryption key. Rippers : A ripper is a program that allows you to break this encryption and "rip" out the files from the DVD, without it being turned into garbage data. Basically, it allows you to copy files from the DVD to your hard-drive successfully. This is not to be confused with CD ripping, which is the ripping of digital data off the audio CD - DVD ripping is really just DVD copying (to the hard-drive). Note that DVDs, unlike audio CDs, do not have a special "audio track" - the audio information is stored in a VOB file (see below) and are much like other digital video formats (eg. avi,mpg,rm). VOB Files : VOB files are the default format of DVD movies. This files may contain several streams of audio/video "multiplexed" together (eg. chapters/language selections). These files, once ripped, can be played back with any soft-DVD player that supports the file opening feature (presently, only the Ravisent/Elsa player does not). VOB files have a naming standard : vts_xx_yy.vob xx - Title number yy - Section number The whole movie is usually contained within 1 title (usually vts_01), while the rest of the titles may be for things such as extras, trailers ... Video_ts.vob usually contains the main menu information. Each section of the title (eg. vts_01_1.vob) cannot exceed 0.99GB in size. Normally, the title that contains the actual movie is located in a title that has many 0.99GB sized files - the last one in the title set may not be this size. IFO/BUP Files : IFO files contain the formatting information of the VOB files, which tells the DVD player exactly how the DVD should be played (eg. aspect ratio, subtitles, languages, menus ...). BUP files are backups for IFO files, which are needed if the IFO files gets corrupted. If you rip the DVD without IFO files, then the VOB files may not play correctly, or may not even play at all. Similarly for conversion, IFO files are essential since video converters like FlasKMPEG (which supports IFO parsing) will need them if you want to encode videos, or fix multi-angle ripping problems (see below). Whenever in this guide I refer to "ripping the entire DVD", I mean ripping all the VOB files and the IFO/BUP files as well. Macrovision/Region : Region and Macrovision (copy protection) are encoded onto VOB files. Some rippers offer you the ability to rip out Region and Macrovision protection during normaing ripping. Once ripped this way, the files will play in any DVD player, and will not have Macrovision or region protection problems. Multi-angle ripping : DVDs like The Matrix feature special content such as "Follow the White Rabbit" feature, which overlays a white rabbit on screen during certain special effect scenes, and if you highlight the white rabbit and press enter, you can access 8 hidden special effects features. Ripping of DVDs that contain these features, or others (eg. seamless branching titles like The Patriot, T2 : Ultimate DVD Edition, The Abyss) can be diffcult, if you don't rip the IFO/BUP files (remembering the IFO/BUP files contain the information to tell the player/ripper how to playback these DVDs). Newer rippers have special options that allow you to rip these types of VOB files successfully. Merging : Some rippers allow you to merge the VOB files during ripping. This is not recommended. Merging VOB files will most likely damage their file structures (much like how if you merge 2 ZIP files, you won't get a big ZIP file that contains all the contents of the 2 smaller ZIP files). If you ripped the IFO/BUP files, then it is these files that will tell the player/converter to play/convert the multiple VOB files in series (with no gaps in between), and even without the IFO/BUP files, FlasKMPEG (a conversion tool) can still convert files with the same title number (see VOB files above).
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