[FFmpeg-user] libx264 2 pass encoding...

[John Doe]

From: Andy Sheen <sheen.andy at googlemail.com>

> John Doe wrote on Tue 11 Oct at 10:06 UK time
>>  I am debugging my old command lines and I bumped into an x264 2 pass 
>> problem:"[libx264 @ 0x1ccd460] constant rate-factor is incompatible with 
>> 2pass."
>>  I understand that lossless presets won't work.
>>  I tried the ipod presets... same.
>>  I did not find any *pass presets files...
>>  I only got: libvpx-*, libx264-ipod* and libx264-lossless* presets.
>>  I tried no presets...
> ... -vpre slow_firstpass -vpre main ...
> ... -vpre slow -vpre main

From: Jonathan Tanant <jonathan at free.fr>
> ... -vpre slow_firstpass -vpre ipod640 ...
> ... -vpre slow -vpre ipod640 ...

Thanks for your replies.
The problem is that:
  File for preset 'slow' not found
  File for preset 'slow_firstpass' not found
From ffmpeg source:
  $ ls ffmpeg/ffpresets/
  libvpx-1080p.ffpreset
  libvpx-1080p50_60.ffpreset
  libvpx-360p.ffpreset
  libvpx-720p.ffpreset
  libvpx-720p50_60.ffpreset
  libx264-ipod320.ffpreset
  libx264-ipod640.ffpreset
  libx264-lossless_fast.ffpreset
  libx264-lossless_max.ffpreset
  libx264-lossless_medium.ffpreset
  libx264-lossless_slow.ffpreset
  libx264-lossless_slower.ffpreset
  libx264-lossless_ultrafast.ffpreset

Any idea from where I could get these presets...?

Thx,
JD