[FFmpeg-user] What parameters were set in preset?

[Qianliang Zhang]

So cool, thank you


On Wed, Aug 20, 2014 at 11:32 AM, Luke Davis <l1 at newanswertech.com> wrote:

> On Wed, 20 Aug 2014, Qianliang Zhang wrote:
>
>  You know, while doing x264 encode, -preset can do a good job. Current
>> presets in descending order of speed are: ultrafast, superfast, veryfast,
>> faster, fast, medium, slow, slower, veryslow, placebo. But what are these
>> values stand for? What parameters are used and set in these presets?
>>
>> Could anybody explain? Appreciate.
>>
>
> From x264 --fullhelp:
>
>       --preset <string>       Use a preset to select encoding settings
> [medium]
>                                   Overridden by user settings.
>                                   - ultrafast:
>                                     --no-8x8dct --aq-mode 0 --b-adapt 0
>                                     --bframes 0 --no-cabac --no-deblock
>                                     --no-mbtree --me dia --no-mixed-refs
>                                     --partitions none --rc-lookahead 0
> --ref 1
>                                     --scenecut 0 --subme 0 --trellis 0
>                                     --no-weightb --weightp 0
>                                   - superfast:
>                                     --no-mbtree --me dia --no-mixed-refs
>                                     --partitions i8x8,i4x4 --rc-lookahead 0
>                                     --ref 1 --subme 1 --trellis 0
> --weightp 1
>                                   - veryfast:
>                                     --no-mixed-refs --rc-lookahead 10
>                                     --ref 1 --subme 2 --trellis 0
> --weightp 1
>                                   - faster:
>                                     --no-mixed-refs --rc-lookahead 20
>                                     --ref 2 --subme 4 --weightp 1
>                                   - fast:
>                                     --rc-lookahead 30 --ref 2 --subme 6
>                                     --weightp 1
>                                   - medium:
>                                     Default settings apply.
>                                   - slow:
>                                     --b-adapt 2 --direct auto --me umh
>                                     --rc-lookahead 50 --ref 5 --subme 8
>                                   - slower:
>                                     --b-adapt 2 --direct auto --me umh
>                                     --partitions all --rc-lookahead 60
>                                     --ref 8 --subme 9 --trellis 2
>                                   - veryslow:
>                                     --b-adapt 2 --bframes 8 --direct auto
>                                     --me umh --merange 24 --partitions all
>                                     --ref 16 --subme 10 --trellis 2
>                                     --rc-lookahead 60
>                                   - placebo:
>                                     --bframes 16 --b-adapt 2 --direct auto
>                                     --slow-firstpass --no-fast-pskip
>                                     --me tesa --merange 24 --partitions all
>                                     --rc-lookahead 60 --ref 16 --subme 11
>                                     --trellis 2
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