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Re: Backing Up Your Blu-Ray Movies
Just as an extra few bits to add (albeit REALLY late, as I didn't notice this thread earlier), if all you want is the movie, and don't need the extra BD features like menus, then you can save a lot of space without sacrificing any quality (or time) by reencoding, simply by remuxing to mkv.
All you need to do after you've ripped the disc (and trust me, you CAN use the computer for other things in the meantime, be it solitaire or Crysis while doing this), import the main m2ts file into TSMuxer, unselect everything except the video track and the main audio track (you can select other tracks as well if you want) and click the demux option (downmix to dts or ac3 if you wish, same way as ExtremePC described).
This should leave you with the elementary streams saved as raw .264 (or was it .h264?) and .ac3 or .dts or whatever. You can now import these files into mkvmerge and mux into an mkv (make sure you specify the frame rate of your movie - probably 23.976fps - as the elementary stream won't contain the elementary stream info, otherwise mkvmerge will just assume 25fps).
The advantages of this method are that you save not only the space taken up by all the extra tracks, but also the unnecesary overhead taken up by the m2ts container, which will be about 10% bigger than the total of the tracks it contains. On a BD movie, this can be around 2GB of wasted space. You also don't lose ANY quality as you haven't reencoded anything, it is bit for bit identical to the original, just in a different container.
All up, it should only take a few minutes. Your resultant mkv should be below 20GB depending on the bitrate of the original movie (my mkv of The Prestige is 16.7 GB). You won't get as small a file as the reencoding suggested by extreme, but it's quicker and easier. Which method is better for you really depends on how much space you have, and how lazy you are.
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