On Wed, 16 Jul 2014 01:44:42 -0400 (EDT)
Luke Davis <[email protected]> wrote:

> On the page:
> 
> https://trac.ffmpeg.org/wiki/Encode/H.264
> 
> It states:
> 
> You can see a list of current presets with -preset help, and what settings 
> they 
> apply with x264 --fullhelp.

Try:
ffmpeg -f lavfi -i nullsrc -c:v libx264 -preset help -f mp4 -

Among other things it will display:
x264 [error]: invalid preset 'help'
[libx264 @ 0x8c3240] Error setting preset/tune help/(null).
[libx264 @ 0x8c3240] Possible presets: ultrafast superfast veryfast
faster fast medium slow slower veryslow placebo
[libx264 @ 0x8c3240] Possible tunes: film animation grain stillimage
psnr ssim fastdecode zerolatency

I'll try to clarify the wiki article.
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