[FFmpeg-user] After reading x264 Encoding Guide, some questions

Roger Pack rogerdpack2 at gmail.com
Fri Dec 7 19:20:05 CET 2012

> I have some questions remaining that don't seem to be covered in the
> documentation available that I would like to clear up.

Feel free to edit it once you figure out your questions :)

> 1. The guide refers to the -crf and -qp options but neither is covered in
> http://www.ffmpeg.org/ffmpeg.html. What is their relationship to each other
> and when is it advisable to use which? How do these two relate to the
> q=nn.n
> printed after encodes?

http://mewiki.project357.com/wiki/X264_Settings may be helpful.  I
believe they basically control the q value, but I don't know.

> 2. I seem to recall reading somewhere that the use of presets has been or
> is
> being deprecated in favour of profiles(?). Is this merely to avoid
> cluttering presets with obsolete stuff and only using them for selective
> over-rides when absolutely necessary?

A profile is different than a preset, though I could be wrong.

> 4. Both the Encoding Guide and the ffmpeg documentation refer to 'x264
> -fullhelp', but ffmpeg does not recognise such a parameter and the "Zeranoe
> FFmpeg Builds" do not include that executable. Is one meant to download
> x264
> from videolan.org?

Yeah basically.

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