I have a quality problem in Arch Linux. Usually I'm using (K)Ubuntu for Kdenlive (because of the quality problem in Arch Linux), but because of some other issues I have with Kdenlive in (K)Ubuntu, I want to know, how I can get rid of my problem in Arch Linux.

First some infos:
Kubuntu 10.04, 64bit
Arch Linux, 32bit
Kdenlive 0.7.7.1 (same for both distros), mlt 0.5.4 (same for both distros)

Rendering parameters: f=mp4 acodec=libmp3lame ab=128k ar=44100 vcodec=mpeg4 minrate=0 b=6000k s=1366x768 aspect=%dar mbd=2 trellis=1 mv4=1 subq=7 qmin=10 qcomp=0.6 qdiff=4 qmax=51 pass=2
(same for both distros)

I attached two pictures showing the rendering result for both distros. The Arch Linux one has a lower quality (and not good enough for me).

I want to know: Why?

And: How can I help to get the same result for both distros? (besides programming, I cannot program)

Maybe a difference in ffmpeg.
Although I would expect Archlinux to have a newer version of ffmpeg.

I changed the codec. libx264 increased the quality. Maybe Arch Linux doesn't like the mpeg4-codec. :-) Problem solved for me.