can somebody explain constant quality

Discussion in 'Apple TV and Home Theater' started by suspect9, Feb 24, 2009.

  1. suspect9 macrumors newbie

    Joined:
    May 17, 2008
    #1
    Hello All

    Nob questions here about the constant quality scale in Handbrake. I understand that the appleTV option has a preset of 59%. I had played around with this for making my DVD rips smaller.

    However I am going to start ripping some of TV series DVD's (Thunderbirds etc) and I do not want to compress(?) the files. Do I leave constant quality on 100%? The handbrake guide states it should never be above 80%.

    Any advice welcome

    Cheers
     
  2. MacBoobsPro macrumors 603

    MacBoobsPro

    Joined:
    Jan 10, 2006
    #2
    I dont bother with constant quality. I set the average bitrate at 2500kbps (good quality) and let it do its thing.
     
  3. Thomss macrumors member

    Joined:
    Oct 2, 2008
    #3
    I did about 120 of my DVD's in the above way!
    then got a nice config with 59% constant quality and my files are all MUCH smaller and look even better!

    so of course I've been re-doing a load of my movies again... but so far I've gained a LOAD of hard drive space back on my drives :D

    the only time I use constant is if it's from a HD MKV etc...:eek:



    TRY IT!
     
  4. MacBoobsPro macrumors 603

    MacBoobsPro

    Joined:
    Jan 10, 2006
    #4
    I would if HB didnt constantly crash on me since I updated 0.9.3 (or whatever the latest version is). I noticed the new ATV preset had changed to 59% constant in the update. Once they fix the crashes I will give it a go.
     
  5. NightStorm macrumors 68000

    Joined:
    Jan 26, 2006
    Location:
    Whitehouse, OH
    #5
    No, do not set CQ to 100%... the result will be very large files (larger than the source) that look no better than the original. I'd recommend keeping it at 59%, however older TV shows with a lot of noise/artifacts can lead to the encoder using more bits than it really needs to use to preserve quality. In those situations, you'd want to lower it a bit to compensate.

    All of my DVD encodes are done at 59%. Bluray/HDDVD are 57% (with the exception of BSG S1 HDDVD which are encoded at 55% due to the god awful quality found on these discs).
     
  6. rWally macrumors regular

    Joined:
    Sep 17, 2006
    Location:
    Denver, CO
    #6
    Once you start getting above 62% or so (depending on the source) you'll be very hard pressed to notice a difference between the rip and the original DVD. Compressing the file doesn't really cost you much in terms of picture quality but it saves you a ton of space on the HD so give it a try.
     
  7. d21mike macrumors 68040

    d21mike

    Joined:
    Jul 11, 2007
    Location:
    Torrance, CA
    #7
    I was using "custom" HiRes iPod setting in 0.9.2 with 1500 (up from 1000 and I wanted to play on iPhone and AppleTV). When I upgraded to 0.9.3 I notice everything was based on 59% (iPhone Preset and AppleTV Prest (which was 2500) so I assumed it must be better so I change to using 59% and the file size was much smaller. However, with my testing I noticed the quality of the movie I tested with was much less (then the 1500). Maybe it was due to the movie or maybe it was due to only a the first part of the movie (only tested with only 2 chapters). In any case I swithed back to 1500 because I was happy with everything that I already encoded.
     
  8. Rich1963 macrumors 6502

    Joined:
    Jul 18, 2008
    #8
    Remember something else. The whole point of using Handbrake, besides the converison to .m4v, is to use the excellent compression characteristics of X264 to compress and achieve little to no degradation of the source.

    There was a thread running over on Handbrake's forums awhile back (I think about AppleTV settings post RDO) where 3 screen shots were posted; 1 with the original DVD source, one with handbrake .9.2, and one using all of the AppleTV-accepted X264 compression bells and whistles, and most viewers felt that the .9.3 conpression running at a CQ of 62% was the best looking.

    I encoded a DVD over the weekend and watched it back on a Samsung 1080p 50" plasma, and was truly impressed with the conversion. And this is after encoding 350 DVDs already. Trust me. Use CQ fo 62% as well as the settings listed in that Handbrake thread, and you won't be disappointed. The Handbrake team deserves a pat on the back. I'd buy them a beer if they were local.
     

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