I'm trying to render a video using the x264 codec and the "vpre" argument doesn't seem to be getting recognized. I've installed ffmpeg & x264 via the custom ubuntu instructions & otherwise have a base ubuntu Oneric install. The export profile looks like this:

vcodec=libx264 acodec=libmp3lame ab=128k ar=48000 b=4000k vpre=slow threads=0

The actual ffpreset files are here:
/usr/local/share/ffmpeg/libx264-slow.ffpreset

The result is a file that has no video & maybe 1 second of audio. I tried generating a render script and got the following messages:


> /usr/bin/melt /home/foo/kdenlive/scripts/script001.sh.mlt -verbose -profile atsc_720p_30 -consumer avformat:/home/foo/kdenlive/untitled.mkv progress=1 f=matroska acodec=libmp3lame ab=128k ar=48000 vcodec=libx264 vpre=/usr/local/share/ffmpeg/libx264-slow.ffpreset b=4000k threads=0
[producer avformat] audio: total_streams 1 max_stream 1 total_channels 2 max_channels 2
/usr/local/share/ffmpeg/libx264-slow.ffpreset: [ ref=1, preset=slow ]
[libx264 @ 0x7fb88a13ddc0] broken ffmpeg default settings detected
[libx264 @ 0x7fb88a13ddc0] use an encoding preset (e.g. -vpre medium)
[libx264 @ 0x7fb88a13ddc0] preset usage: -vpre -vpre
[libx264 @ 0x7fb88a13ddc0] speed presets are listed in x264 --help
[libx264 @ 0x7fb88a13ddc0] profile is optional; x264 defaults to high


I've tried using just "slow" and the full file as in the above example. Any advice on how I can change that profile to get the vpre processed?

kdenlive: 0.8
mlt: 0.7.4-3
ffmpeg: built from git on 2011-10-22
x264: built from git on 2011-10-22