curlew won't convert mp4 to webm

[trappedinspacetime]

Hi
First of all congrats on your opensource project. I like curlew.
However I can not convert mp4 to webm with curlew. I am on ubuntu 13.10 32 bit platform. I thought it's related to ffmpeg configure flag an recompiled the latest version with "--enable-gpl --enable-libx264 --enable-libvorbis --enable-libvpx --enable-nonfree --enable-libmp3lame --enable-libfaac --enable-libtheora --enable-libxvid --enable-pthreads --enable-postproc --disable-debug --enable-shared" flags and installed But problem still exist. I can convert mp4 to webm in terminal like "ffmpeg -i input.flv -vcodec libvpx -acodec libvorbis output.webm"

Command line #1:

---

avconv -y -i /home/_/Desktop/LFS/LFS-7.4/LFS 7.4 - 2.1 vii. Host System Requirements (video 1).mp4 -f webm -b 1100k -r 30 -vcodec libvpx -ab 128k -ar 44100 -acodec libvorbis /home/_/Desktop/LFS 7.4 - 2.1 vii. Host System Requirements (video 1).webm

Error detail:

---

Stream #0.1(und): Audio: aac, 44100 Hz, stereo, fltp, 191 kb/s (default)
Metadata:
  creation_time   : 2013-09-11 08:43:19

Unknown encoder 'libvpx'
What could be the problem?

Thanks

[chamfay]

please install libvpx1 package

[trappedinspacetime]

Thank you for reply. libvpx1 (1.2.0-2) already installed and I reinstalled it again. It converts well to other formats except webm.