MKV to MP4 loss of video quality

Discussion in 'Apple TV and Home Theater' started by kingofkind, Nov 18, 2012.

  1. kingofkind macrumors member

    May 30, 2011
    Im looking to rip my Blurays to MP4. I plan on using DVDFad or makemkv to break the encryption, and handbrake to convert it into mp4. Id like to have my files around 6-9gb per movie. When I convert it to mp4 will that make it lose it's quality? I basically want it to look as good as it is on the disk, or else I really see no point in ripping it.
  2. Ace1024 macrumors member

    Jun 19, 2011
    Why not just keep the video remuxed - not compressed. That's the only way you'll keep the full quality.

    To have comparable quality to a blu-ray rip, you might want to give Handbrake a try. It's free and has a great reputation for maintaining quality. Also, perhaps make the encode around 12gb. I know it's substantially more, but it's probably necessary to maintain a decent bit rate.
  3. kingofkind thread starter macrumors member

    May 30, 2011
    Yea i meant to say i was going to use handbrake to make it an mp4. Sorry that this is a total noob question, but what is remuxed?
  4. Pyromonkey83 macrumors 6502

    May 24, 2009
    remuxed is essentially taking the original file, then putting it into a new container (in this case mp4) that the ATV can read. remuxing will also convert the audio from DTS/AC3 to AAC audio so that the ATV can read and use it as well.

    The most popular tool to remux is Subler, and it works great. It also takes roughly 3-5 minutes to remux in comparison to multiple hours to re-encode through handbrake.
  5. Menneisyys2 macrumors 603

    Jun 7, 2011
    As has been explained by the others, use Subler. You might also want to check out my remuxing-specific articles - I've posted several of them in this forum.
  6. HobeSoundDarryl macrumors 604


    Feb 8, 2004
    Hobe Sound, FL (20 miles north of Palm Beach)
    Fundamentally, you are saying you want to maintain maximum quality and cut file sizes by 60% or more. It's one or the other. You are also wanting to target a file size range instead of dynamically adapting file sizes based on a goal of maximizing quality. Again, one or the other.

    The answers so far are generally about preserving the exact same quality by rewrapping the video file in the MKV. For maximizing the quality, that is how to do it. File sizes will be just about exactly the same as the MKV for the title you are re-wrapping.

    Since you obviously have a goal of smaller file sizes too, running it through Handbrake and using the constant quality slider will yield an excellent quality video file, typically at a substantially smaller file size. The constant quality slider goes against what you say you want to do (target a specific file size range) by dynamically adapting the output file size in an effort to preserve as much visual quality as possible. That means sometimes you'll end up with file sizes 35-50% smaller than the MKV while other times they might shrink by 70-85%. Whole 1080p movies might come out at 20GB or they might come out at 3.5GB.

    Using Handbrake this way yields a very good-looking file much smaller than the original. Even the discerning eye will have a hard time noticing the difference between the original and this copy. If you have very discerning eyes, consider running a few through and then letting your own eyes see if you can see the difference on your own hardware.

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