Changes between Version 4 and Version 5 of Encode/H.264


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Timestamp:
Aug 11, 2012, 8:37:14 AM (7 years ago)
Author:
rogerdpack
Comment:

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  • Encode/H.264

    v4 v5  
    1313The range 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.
    1414
    15   '''Note:''' These CRF values apply to 8-bit x264.
     15  '''Note:''' These CRF values apply to 8-bit x264 (the typical).
    1616
    1717=== 2. Choose a preset ===
    1818A preset is a collection of options that will provide a certain encoding speed:compression ratio. A slower preset will provide better compression (compression is quality per filesize). General usage is to use the slowest preset that you have patience for. Current presets in descending order of speed are: `ultrafast`, `superfast`, `veryfast`, `faster`, `fast`, `medium`, `slow`, `slower`, `veryslow`, `placebo`. Ignore `placebo` as it is a joke and a waste of time (see FAQ).
    1919
     20You can also choose a tune and/or profile.
     21
    2022=== 3. Continue encoding ===
     23
    2124Use these same settings for the rest of your videos if you are encoding more. This will ensure that they will all have the same quality.
    2225
     
    4952
    5053== Lossless H.264 ==
    51 You can use `-qp 0` or `-crf 0` to encode a lossless output. Only two of the presets are generally useful: `ultrafast` or `veryslow` since either a fast encoding speed or best compression are usually the most important factors.
     54You 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.
    5255
    53 === Lossless Example (fast encoding) ===
     56=== Lossless Example (fastest encoding) ===
    5457
    5558{{{