the command mlt -query producers returned the following:
No command 'mlt' found, did you mean:
 Command 'llt' from package 'storebackup' (universe)
 Command 'mft' from package 'texlive-base' (main)
 Command 'mgt' from package 'mgt' (universe)
 Command 'mt' from package 'mt-st' (universe)
 Command 'mt' from package 'star' (universe)
 Command 'mt' from package 'cpio' (main)
 Command 'melt' from package 'melt' (universe)
 Command 'mln' from package 'mmv' (universe)
i do have all of the mlt packages installed that openshot required (installed as dependencies on its own) so i went ahead and installed melt
this is the output from the command melt -query producers:
---
producers:
  - avformat
  - color
  - colour
  - consumer
  - loader
  - hold
  - noise
  - ppm
  - libdv
  - frei0r.ising0r
  - frei0r.lissajous0r
  - frei0r.nois0r
  - frei0r.onecol0r
  - frei0r.partik0l
  - pango
  - pixbuf
  - framebuffer
  - kino
  - melt
  - melt_file
  - qimage
  - pgm
  - vorbis
  - xml
  - xml-string
...

i don't understand your question. i am doing this all on one computer, and i've installed openshot the following ways on this computer with the following results:
installed openshot from build-wizard, chose 9.04 32bit (option 3?) then chose the git build of ffmpeg (option 3?) - crash at end of export
completely removed openshot, mlt, ffmpeg, x264 packages
installed openshot from developers ppa - crashed at startup. deleted the .openshot folder, no change
completely removed openshot, mlt, ffmpeg, x264 packages
installed openshot from experimental ppa - can export x264 with ac3 audio, crashes at start of export with libaac or libmp3lame audio
installed all unstripped libav packages - now openshot can export x264 (and does not say x264 not found as it did before) but still crashes with libfaac audio, exports with no errors perfectly with x264 and libmp3lame audio
installed melt to get your output, did not change the behavior of openshot at all

i redid the command jonathan suggested above with these results:
rgoebel@ronbuntu:~$ melt -verbose -profile dv_pal_wide /home/rgoebel/projects/kodak/kittehshoelove/811_1411.MOV -consumer avformat:/home/rgoebel/projects/kodak/kittehshoelove/test1.MOV acodec=mpeg2 ab=128k ar=44100 f=mp4 vcodec=libx264 minrate=0 b=900k
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x92d3a00]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x92ffd20]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x9395720]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
consumer_avformat.c: audio codec mpeg2 unrecognised - ignoring
[libx264 @ 0x92da620]interlace + direct=temporal is not implemented
[libx264 @ 0x92da620]using SAR=64/45
[libx264 @ 0x92da620]interlaced (1) > level limit (0)
[libx264 @ 0x92da620]using cpu capabilities: MMX2 SSE2Fast SSSE3 Cache64
[libx264 @ 0x92da620]profile Main, level 5.1
consumer_avformat.c: Unable to encode audio - disabling audio output.
[mp4 @ 0x931be00]track 1: codec frame size is not set
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93dba80]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x93ffe60]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
[mov,mp4,m4a,3gp,3g2,mj2 @ 0x9473660]ISO: File Type Major Brand: qt  
st:0 removing common factor 3 from timebase
st:1 removing common factor 128 from timebase
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
|1=-10| |2= -5| |3= -2| |4= -1| |5=  0| |6=  1| |7=  2| |8=  5| |9= 10|
+-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+ +-----+
+---------------------------------------------------------------------+
|               H = back 1 minute,  L = forward 1 minute              |
|                 h = previous frame,  l = next frame                 |
|           g = start of clip, j = next clip, k = previous clip       |
|                0 = restart, q = quit, space = play                  |
+---------------------------------------------------------------------+
[h264 @ 0x93ec700]AVC: Consumed only 145827 bytes instead of 145830
[h264 @ 0x93ec700]no picture
[h264 @ 0x93ec700]B picture before any references, skipping
[h264 @ 0x93ec700]decode_slice_header error
[h264 @ 0x93ec700]no frame!
[h264 @ 0x93ec700]AVC: Consumed only 14865 bytes instead of 14868
[h264 @ 0x93ec700]B picture before any references, skipping
[h264 @ 0x93ec700]decode_slice_header error
[h264 @ 0x93ec700]no frame!
[libx264 @ 0x92da620]frame=   0 QP=2.00 NAL=3 Slice:I Poc:0   I:1620 P:0    SKIP:0    size=1359 bytes SSIM Y:1.00000
Floating point exception

just FYI: here is the test video output i was working with the whole time, this is the successful export with x264 vid and mp3 audio:
http://www.youtube.com/watch?v=16vS1Y9xZI8
if you watch that, it will explain the weird path in my melt command