The audio and video are synced-up (a.k.a., “multiplexed” or “muxed”) and are bundled together into a single file using a container format. The short explanation is that every video file is made up of 3 different parts: the video stream, the audio stream, and the container. You may have heard words like MKV, MPEG–4, AVI, MP3, AAC and other acronyms. Video files are a lot more complicated than most people realize. If you’re on Windows, check-out AnyDVD and AnyDVD HD. You can expect a rip to take 15–30 minutes, depending on the size of the disc. Backing up is as simple as inserting the DVD, launching RipIt, and choosing “Rip”. A license is a paltry $25, and I recommend supporting the developers of this software. For backing up personal DVDs so that they can be format-shifted, RipIt is highly recommended. Pretty much every Mac since the early 2000s has shipped with a DVD drive, so these are easy to come by. The external BD-R drive is a Buffalo MediaStation 6X USB 2.0 Portable Blu-Ray Writer. The Mac used for this tutorial is an 17" MacBook Pro (early–2011) with a 64-bit quad-core 2.2 GHz Intel Core i7 processor, 16 GB of RAM, OS X Mountain Lion, and a standard, built-in Superdrive. The encryption is where the line is drawn. This is why backing-up CDs is commonplace while backing-up DVDs and Blu-rays is frowned upon. Historically, this sort of thing fell under fair use law, but the DMCA (1998) makes it illegal to crack the encryption. Making a personal backup of movies you own is in a legal gray-area in the U.S. Because of this, I choose to exercise my fair-use right to format-shift my movies into something more convenient.
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