VideoHelp Forum

Try DVDFab and copy Ultra HD Blu-rays and DVDs! Or rip iTunes movies and music! Download free trial !
+ Reply to Thread
Results 1 to 12 of 12
Thread
  1. Member
    Join Date
    Feb 2006
    Location
    England
    Search Comp PM
    Just wondering what CRF value everyone uses and for what resolution? H264 and H265?
    Quote Quote  
  2. the default crf=23 is typical for compressed hd x264 video. 21-25 is commonly used.
    Quote Quote  
  3. It varies depending on the purpose of the encoding. I usually use CRF 18 in x264 for video that I'm going to watch (I keep my collection on a NAS, accessible from any PC/TV in the house). Sometimes a little higher for stuff I don't care that much about, a little lower for videos where visual quailty really matters.
    Quote Quote  
  4. Member
    Join Date
    Mar 2011
    Location
    Nova Scotia, Canada
    Search Comp PM
    I ddon;t think you'll find total consensus here. But I would say that for example you'll need a lower crf for Lord Of The Rings than old anime. It depends on the source a lot.
    Quote Quote  
  5. Member
    Join Date
    Feb 2006
    Location
    England
    Search Comp PM
    Originally Posted by Hoser Rob View Post
    I ddon;t think you'll find total consensus here. But I would say that for example you'll need a lower crf for Lord Of The Rings than old anime. It depends on the source a lot.
    I am just interested in what people say. The more opinions, the better.
    Quote Quote  
  6. Member
    Join Date
    Jul 2009
    Location
    United States
    Search Comp PM
    I also use 18 for most stuff. 20 is as high as I'll go as I find the lack of quality distracting at higher CRFs.
    Quote Quote  
  7. For examlpe like VHS :

    1920 x 1080 res : crf=20 high quality, crf=25 normal, crf=30 long play (here x265 better quality, x264 blocking)

    But CRF can also be thought of as an image quality balance that can be shifted back and forth.
    Quote Quote  
  8. Movies? Waste of time anyway. If you insist to encode something you like, then be generous, quality is preferred over quantity. And movies are in vast range of shape. A guy would show up saying, "I prefer quantity over quality". Other would say "I prefer Quantity and quality at the same time". So there is no answer for what you ask.

    If those are unique videos of yours, which means you prefer quality and considering how it was obtained, VHS, DVavi or HD coming from a camcorder, you need lower CRF for those lower resolutions to not introduce more artifacts. For SD resolution I'd still use x264 (H264) over HEVC even if progressive.
    Quote Quote  
  9. Member Alkl's Avatar
    Join Date
    Mar 2018
    Location
    Germany
    Search Comp PM
    For animation I use the following
    • x265 - crf 17 / 18
    • aomenc - q* 25 / 30
    * (the quantization setting in aomenc seems to act like a constant rate factor, I can be wrong tho)

    For live action:
    • x265 - crf 20-25
    • aomenc - q 28 / 35

    In the end it really depends on the source. There are cases were x265 crf 18 is completely overkill for animation, the same goes the other way around.

    Keep in mind, that CRF is not a constant quality, it will adjust the quantizer accordingly to the scene complexity / motion.
    Quote Quote  
  10. Originally Posted by Hoser Rob View Post
    I ddon;t think you'll find total consensus here. But I would say that for example you'll need a lower crf for Lord Of The Rings than old anime. It depends on the source a lot.
    Sometimes old anime can be hard to encode well, because large blocks of color and/or color gradients can result in color banding. There's ways to discourage that sort of thing, but more accurate encoding almost always requires more bits, which you get from lower CRF values.

    When there's detail everywhere there's less likely to be banding problems, but of course live action and CGI etc can challenge an encoder in different ways. Live action will probably result in a higher bitrate than anime at the same CRF value, all else being equal, but mightn't need a lower CRF value. Or it might. Or maybe not......
    Quote Quote  
  11. My views are well known, I do not use crf and refuse to use it for anything other than testing,
    Quote Quote  
  12. Originally Posted by sophisticles View Post
    My views are well known, I do not use crf and refuse to use it for anything other than testing,
    Yeah... but it's pretty odd given every time you use it for testing you seem to prove how well it works.
    Quote Quote  



Similar Threads