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  1. I have a number of DVD's on HDD (containing .vob files, etc.) and like to convert those to .iso files.
    (with e.g. ImgBurn or DVDFab)

    Curious to know...:
    will there be any loss of quality, or will the quality be the same, or at least very close to the same, i.e. no noticeable difference.

    Oh, btw, I have done a test as to convert a DVD to .mkv using MPEG-2 video stream format (not H.264/AVC).
    This resulted in a 4GB file (source was/is 4.6GB)
    However, when using H.264 x264 it would result in something like 1.4-1.7GB

    So, if space isn't important, I guess MPEG-2 is to be preferred (in case of .mkv).
    This is a bit off-topic, I know.

    The question was about converting to .iso.

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  2. Member netmask56's Avatar
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    Sep 2005
    Sydney, Australia
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    If you simply wrapped the original DVD in a MKV container using MakeMKV, there is no loss or no change in size. So if source is 4.6GB for the whole disc then the resulting MKV files of all the titles on the disc will total 4.6GB approx.
    SONY 75" Full array 200Hz LED TV, Yamaha A1070 amp, Zidoo UHD3000, BeyonWiz PVR V2 (Enigma2 clone), Chromecast, Windows 7 Ultimate, QNAP NAS TS851
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  3. Member
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    Aug 2013
    Central Germany
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    You do not "convert" a DVD to an ISO file; the ISO file is an image of the whole media content, files (VOB, IFO, BUP) as well as the file system (in case of a Video DVD, both ISO-9660 and Micro-UDF) including a directory structure sector by sector, as if it were burned or pressed onto a physical disc. The file contents will be preserved byte-exact. Thus, quality cannot be degraded.

    In addition to the ISO image (especially if you have a DVD-9 with layer break), ImgBurn will also create an MDS file describing the track layout (possibly including the position of the layer break, very important for a DVD-9).

    You may then mount this ISO (or MDS) file in a virtual CDVD drive, like e.g. Daemon Tools, and it will appear to the system like you would have inserted a physical disc into a real drive.
    Last edited by; 20th Aug 2018 at 05:44.
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  4. Many, many thanks to you both! All clear. Will check out MakeMKV as well.
    Again thanks!!
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