Multiple output (with multiples presets) not working

Hi,

I'm using learning using Video module which look very nice :)
For best HTML5 compatibility, I need to convert my source video to 2 output format :

• WebM (vp8 / vorbis)
• Mp4 (H264 / AAC)

So I made 2 presets.

Conversion working nice but in my node, I only see 1 video file linked to the node.
In my video field, settings of 2 items max by field, (table "field_data_field_video") I have only 1 file linked to my node. :(

(In file_managed table, my 2 files are present)

What I'm doing wrong ?

Thanks

NB :
FFmpeg config :

ffmpeg version 2.2.git Copyright (c) 2000-2014 the FFmpeg developers
  built on Mar 21 2014 18:11:20 with gcc 4.4.5 (Debian 4.4.5-8)
  configuration: --prefix=/root/ffmpeg_build --extra-cflags=-I/root/ffmpeg_build/include --extra-ldflags=-L/root/ffmpeg_build/lib --bindir=/root/bin --extra-libs=-ldl --enable-gpl --enable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libopus --enable-libtheora --enable-libvorbis --enable-libvpx --enable-libx264 --enable-nonfree --enable-x11grab
  libavutil      52. 67.100 / 52. 67.100
  libavcodec     55. 52.102 / 55. 52.102
  libavformat    55. 34.101 / 55. 34.101
  libavdevice    55. 11.100 / 55. 11.100
  libavfilter     4.  3.100 /  4.  3.100
  libswscale      2.  5.102 /  2.  5.102
  libswresample   0. 18.100 /  0. 18.100
  libpostproc    52.  3.100 / 52.  3.100
Hyper fast Audio and Video encoder