Changes between Version 9 and Version 10 of x264EncodingGuide


Ignore:
Timestamp:
08/14/2012 03:03:55 AM (9 months ago)
Author:
llogan
Comment:

revert confusing statement about lossless parameters; remove additional x264opts example since private options are already mentioned

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  • x264EncodingGuide

    v9 v10  
    4040The range of the quantizer scale is 0-51; where 0 is lossless, 23 is default, and 51 is worst possible. A lower value is a higher quality and a subjectively sane range is 18-28. Consider 18 to be visually lossless: it should look the same as the input but it isn't technically lossless. Increasing the CRF value +6 is roughly half the bitrate while -6 is roughly twice the bitrate. General usage is to choose the highest quality that still provides an acceptable quality. If the output looks good then try a higher value and if it looks bad then choose a lower value. 
    4141 
    42   '''Note:''' The CRF quantizer scale mentioned applies to 8-bit x264 (10-bit x264 quantizer scale is 0-63). You can see what you are using with `x264 --help` listed under `Output bit depth`. 
     42  '''Note:''' The CRF quantizer scale mentioned on this page only applies to 8-bit x264 (10-bit x264 quantizer scale is 0-63). You can see what you are using with `x264 --help` listed under `Output bit depth`. 8-bit is more common amongst distributors. 
    4343 
    4444=== 2. Choose a preset === 
    … …  
    7878 
    7979== Lossless H.264 == 
    80 You can use `-qp 0` or `-crf 0` to encode a lossless output.  Despite being lossless, other parameters still matter.  Only two of the presets are generally useful though: `ultrafast` or `veryslow` since either a fast encoding speed or best compression are usually the most important factors. 
     80You can use `-qp 0` or `-crf 0` to encode a lossless output.  The two useful presets are `ultrafast` or `veryslow` since either a fast encoding speed or best compression are usually the most important factors. 
    8181 
    8282=== Lossless Example (fastest encoding) === 
    … …  
    104104}}} 
    105105 
    106 or  
    107 {{{ 
    108 -x264opts vbv-bufsize=3600:vbv-maxrate=1800:crf=23 
    109 }}} 
    110 though these are somewhat redundant to other "standard" ffmepg settings, and can also be specified each separately. 
    111  
    112106---- 
    113107