[FFmpeg-devel] [PATCH] Additional libx264 presets

[Jason Garrett-Glaser]

On Fri, Feb 12, 2010 at 2:10 AM, Lou Logan <lou at fakeoutdoorsman.com> wrote:
> This patch adds libx264 presets that mostly emulate the x264 presets:
> ultrafast, veryfast, faster, fast, slow, slower, veryslow, placebo.
>
> There are some options that x264 uses that could not be included in
> this patch because there are no equivalent options in FFmpeg:
>
> ultrafast: --aq-mode 0
> slow: --rc-lookahead 50
> slower, veryslow, placebo: --rc-lookahead 60

I tentatively approve this patch, but there is the catch of first pass
options: "veryslow", "ultrafast", and "placebo" all use bframe values
different from default, which would mean fastfirstpass/slowfirstpass
presets would no longer work.  Without a flexible preset-logic system,
we would have to have ultrafast-firstpass, veryfast-firstpass, and so
forth, for first pass presets.

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