VideoHelp Forum

Our website is made possible by displaying online advertisements to our visitors. Consider supporting us by disable your adblocker or try DVDFab DRM and remove iTunes movie & music protection! :)
+ Reply to Thread
Results 1 to 5 of 5
Thread
  1. is there any video quality difference if i use all same settings in CRF, only changes x264 preset?
    Quote Quote  
  2. Yes. Higher (slower) presets deliver better quality at the same CRF.
    Quote Quote  
  3. thank you for the reply
    Quote Quote  
  4. Originally Posted by jagabo View Post
    Yes. Higher (slower) presets deliver better quality at the same CRF.
    I disagree. Quality can go up/down with slower presets at same CRF. Only compression (quality per bit) will always go up with slower presets (except maybe veryslow->placebo).

    Example:
    Code:
    preset		ssim		bitrate
    ultrafast	0,9931685	6311
    superfast	0,9948741	3000
    veryfast	0,9918827	1387
    faster		0,9938993	1716
    fast		0,9942391	1909
    medium		0,9943883	1918
    slow		0,9945562	1925
    slower		0,9946028	1904
    veryslow	0,9943008	1771
    placebo		0,9945342	1796
    (On this sample veryfast has lower quality than ultrafast, veryslow lower than medium.)
    Quote Quote  
  5. Member Bernix's Avatar
    Join Date
    Apr 2016
    Location
    Europe
    Search Comp PM
    I disagree. You can see that very fast SSIM is bit worst then others. It also create smallest filesize at faster speed. On SSIM it seems very small difference but in few minutes it can create smallest size at faster time. Probably this is exception but it is significant.
    Here is graph for 3 min of video. Do not remember if it is H.265 or H.264 but expecting at least similar results.
    So it is different look. It do not take in account any PSNR or SSIM.

    In 3mins just video SD 720x576 there is 7MB difference at much faster encoding time. So I think very fast will not deliver similar quality. Also it is seems on ssim in previous post by sneaker.


    O.k. didn't read last sentence. So same here



    Bernix
    Last edited by Bernix; 9th Sep 2018 at 05:40. Reason: Edit adding last
    Quote Quote  



Similar Threads