Rendering crash - only for H264 Files

Hi everybody,

using Debian SID with packages
(kdenlive 0.8.2.1-0.0, ffmpeg 0.10 experimental, melt 0.7.6-0.5, libx264-120; all from Debian-Multimedia)

and since the last update kdenlive rendering for only for H264 Files
(these are the options: f=mp4 hq=1 acodec=aac ab=%audiobitrate+'k' ar=48000 pix_fmt=yuv420p vcodec=libx264 minrate=0 vb=%bitrate+'k' g=250 bf=3 b_strategy=1 subcmp=2 cmp=2 coder=1 flags=+loop flags2=dct8x8 qmax=51 subq=7 qmin=10 qcomp=0.6 qdiff=4 trellis=1 aspect=%dar pass=%passes)

with the debug messages:

[swscaler @ 0xb049b660] Warning: data is not aligned! This can lead to a speedloss
[NULL @ 0xba2d660] [Eval @ 0xb1953a78] Invalid chars '.6' at the end of expression '0.6' [NULL @ 0xba2d660] Unable to parse option value "0.6"
[libx264 @ 0xba2d660] interlace + weightp is not implemented
[NULL @ 0xb79e260] Codec is experimental but experimental codecs are not enabled, see -strict -2 consumer_avformat.c: Unable to encode audio - disabling audio output.
[mp4 @ 0x9f3b8a0] track 1: codec frame size is not set

All other file creations works well.
Some Hints ?

Its seems to me that i find the reason why: On a virtual native Debian unstable without any experimental packages everything works fine ....